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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@219625 c90b9560-bf6c-de11-be94-00142212c4b1
936 lines
29 KiB
XML
Executable file
936 lines
29 KiB
XML
Executable file
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.50 $ -->
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<appendix id="migration5">
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<title>Migrating from PHP 4 to PHP 5</title>
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<section id='migration5.changes'>
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<title>What has changed in PHP 5</title>
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<para>
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PHP 5 and the integrated Zend Engine 2 have greatly improved PHP's
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performance and capabilities, but great care has been taken to break as
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little existing code as possible. So migrating your code from PHP 4 to 5
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should be very easy. Most existing PHP 4 code should be ready to run
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without changes, but you should still know about the <link
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linkend="migration5.incompatible">few differences</link> and
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take care to test your code before switching versions in production
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environments.
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</para>
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</section>
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<section id="migration5.incompatible">
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<title>Backward Incompatible Changes</title>
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<para>
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Although most existing PHP 4 code should work without changes, you should
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pay attention to the following backward incompatible changes:
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</para>
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<itemizedlist>
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<listitem>
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<simpara>
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There are some <link linkend="reserved.keywords">new reserved
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keywords</link>.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>strrpos</function> and <function>strripos</function> now use
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the entire string as a needle.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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Illegal use of string offsets causes <constant>E_ERROR</constant> instead
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of <constant>E_WARNING</constant>. An example illegal use is:
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<literal>$str = 'abc'; unset($str[0]);</literal>.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_merge</function> was changed to accept only arrays. If a
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non-array variable is passed, a <constant>E_WARNING</constant> will be
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thrown for every such parameter. Be careful because your code may start
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emitting <constant>E_WARNING</constant> out of the blue.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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PATH_TRANSLATED server variable is no longer set implicitly under
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Apache2 SAPI in contrast to the situation in PHP 4, where it is set to
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the same value as the SCRIPT_FILENAME server variable when it is not
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populated by Apache. This change was made to comply with the <ulink
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url="&url.cgispecs;">CGI specification</ulink>. Please refer to <ulink
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url="&url.php.bugs;23610">bug #23610</ulink> for further information,
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and see also the <link linkend="reserved.variables.server">
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$_SERVER['PATH_TRANSLATED']</link> description in the manual. This issue
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also affects PHP versions >= 4.3.2.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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The <constant>T_ML_COMMENT</constant> constant is no longer defined by
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the <link linkend="ref.tokenizer">Tokenizer</link> extension. If
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error_reporting is set to <constant>E_ALL</constant>, PHP will
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generate a notice. Although the <constant>T_ML_COMMENT</constant> was
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never used at all, it was defined in PHP 4. In both PHP 4 and PHP 5
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// and /* */ are resolved as the <constant>T_COMMENT</constant>
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constant. However the PHPDoc style comments /** */, which starting PHP
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5 are parsed by PHP, are recognized as <constant>T_DOC_COMMENT</constant>.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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$_SERVER should be populated with argc and argv if <link
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linkend="ini.variables-order">variables_order</link> includes "S". If
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you have specifically configured your system to not create $_SERVER,
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then of course it shouldn't be there. The change was to always make argc
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and argv available in the CLI version regardless of the <link
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linkend="ini.variables-order">variables_order</link> setting. As in,
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the CLI version will now always populate the global $argc and $argv
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variables.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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An object with no properties is no longer considered "empty".
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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In some cases classes must be declared before use. It only happens if
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some of the new features of PHP 5 (such as <link
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linkend="language.oop5.interfaces">interfaces</link>) are used.
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Otherwise the behaviour is the old.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>get_class</function>, <function>get_parent_class</function>
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and <function>get_class_methods</function> now return the name of the
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classes/methods as they were declared (case-sensitive) which may lead to
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problems in older scripts that rely on the previous behaviour (the
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class/method name was always returned lowercased). A possible solution
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is to search for those functions in all your scripts and use
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<function>strtolower</function>.
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</simpara>
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<simpara>
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This case sensitivity change also applies to the
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<link linkend="language.constants.predefined">magical predefined
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constants</link> <constant>__CLASS__</constant>,
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<constant>__METHOD__</constant>, and <constant>__FUNCTION__</constant>.
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The values are returned exactly as they're declared (case-sensitive).
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ip2long</function> now returns &false; when an invalid IP
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address is passed as argument to the function, and no longer
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<literal>-1</literal>.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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If there are functions defined in the included file, they can be used in the
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main file independent if they are before <function>return</function> or after.
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If the file is included twice, PHP 5 issues fatal error because functions
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were already declared, while PHP 4 doesn't complain about it.
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It is recommended to use <function>include_once</function> instead of
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checking if the file was already included and conditionally return inside
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the included file.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>include_once</function> and <function>require_once</function>
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first normalize the path of included file on Windows so that including
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A.php and a.php include the file just once.
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</simpara>
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</listitem>
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</itemizedlist>
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<para>
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<example>
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<title><function>strrpos</function> and <function>strripos</function> now
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use the entire string as a needle</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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var_dump(strrpos('ABCDEF','DEF')); //int(3)
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var_dump(strrpos('ABCDEF','DAF')); //bool(false)
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>An object with no properties is no longer considered "empty"</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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class test { }
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$t = new test();
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var_dump(empty($t)); // echo bool(false)
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if ($t) {
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// Will be executed
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>In some cases classes must be declared before used</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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//works with no errors:
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$a = new a();
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class a {
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}
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//throws an error:
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$a = new b();
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interface c{
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}
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class b implements c {
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</section>
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<section id="migration5.cli-cgi">
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<title>CLI and CGI</title>
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<para>
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In PHP 5 there were some changes in CLI and CGI filenames. In PHP 5, the
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CGI version was renamed to <filename>php-cgi.exe</filename> (previously
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<filename>php.exe</filename>) and the CLI version now sits in the main
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directory (previously <filename>cli/php.exe</filename>).
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</para>
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<para>
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In PHP 5 it was also introduced a new mode:
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<filename>php-win.exe</filename>. This is equal to the CLI version, except
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that php-win doesn't output anything and thus provides no console (no "dos
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box" appears on the screen). This behavior is similar to php-gtk.
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</para>
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<para>
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In PHP 5, the CLI version will always populate the global
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<varname>$argv</varname> and <varname>$argc</varname> variables regardless
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of any &php.ini; directive setting. Even having
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<link linkend="ini.register-argc-argv">register_argc_argv</link> set to
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<literal>off</literal> will have no affect in CLI.
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</para>
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<para>
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See also the <link linkend="features.commandline">commandline
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reference</link>.
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</para>
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</section>
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<section id="migration5.configuration">
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<title>Migrating Configuration Files</title>
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<para>
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Since the ISAPI modules changed their names, from php4xxx to php5xxx, you
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need to make some changes in the configuration files. There were also
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changes in the CLI and CGI filenames. Please refer to the <link
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linkend="migration5.cli-cgi">corresponding section</link> for more
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information.
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</para>
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<para>
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Migrate the Apache configuration is extremely easy. See the example below
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to check the change you need to do:
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<example>
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<title>Migrating Apache configuration files for PHP 5</title>
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<programlisting role="apache-conf">
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<![CDATA[
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# change this line:
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LoadModule php4_module /php/sapi/php4apache2.dll
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# with this one:
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LoadModule php5_module /php/php5apache2.dll
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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If your webserver is running PHP in CGI mode, you should note that the
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CGI version has changed its name from <filename>php.exe</filename> to
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<filename>php-cgi.exe</filename>.
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In Apache, you should do something like this:
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<example>
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<title>Migrating Apache configuration files for PHP 5, CGI mode</title>
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<programlisting role="apache-conf">
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<![CDATA[
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# change this line:
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Action application/x-httpd-php "/php/php.exe"
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# with this one:
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Action application/x-httpd-php "/php/php-cgi.exe"
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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In other webservers you need to change either the CGI or the ISAPI module
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filenames.
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</para>
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</section>
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<section id="migration5.functions">
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<title>New Functions</title>
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<para>
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In PHP 5 there are some new functions. Here is the list of them:
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</para>
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<para><link linkend="ref.array">Arrays</link>:</para>
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<itemizedlist>
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<listitem>
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<simpara>
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<function>array_combine</function> - Creates an array by using one array
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for keys and another for its values
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_diff_uassoc</function> - Computes the difference of
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arrays with additional index check which is performed by a user supplied
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callback function
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_udiff</function> - Computes the difference of arrays by
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using a callback function for data comparison
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_udiff_assoc</function> - Computes the difference of
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arrays with additional index check. The data is compared by using a
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callback function
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</simpara>
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</listitem>
|
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<listitem>
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<simpara>
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<function>array_udiff_uassoc</function> - Computes the difference of
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arrays with additional index check. The data is compared by using a
|
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callback function. The index check is done by a callback function also
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_walk_recursive</function> - Apply a user function
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recursively to every member of an array
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_uintersect_assoc</function> - Computes the intersection of
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arrays with additional index check. The data is compared by using a
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callback function
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_uintersect_uassoc</function> - Computes the intersection of
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arrays with additional index check. Both the data and the indexes are
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compared by using a callback functions
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>array_uintersect</function> - Computes the intersection of arrays.
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The data is compared by using a callback function
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</simpara>
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</listitem>
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</itemizedlist>
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<para><link linkend="ref.ibase">InterBase</link>:</para>
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<itemizedlist>
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<listitem>
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<simpara>
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<function>ibase_affected_rows</function> - Return the number of rows
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that were affected by the previous query
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_backup</function> - Initiates a backup task in the
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service manager and returns immediately
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_commit_ret</function> - Commit a transaction without
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closing it
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_db_info</function> - Request statistics about a
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database
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_drop_db</function> - Drops a database
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_errcode</function> - Return an error code
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_free_event_handler</function> - Cancels a registered
|
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event handler
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_gen_id</function> - Increments the named generator and
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returns its new value
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</simpara>
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</listitem>
|
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<listitem>
|
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<simpara>
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<function>ibase_maintain_db</function> - Execute a maintenance command
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on the database server
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</simpara>
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</listitem>
|
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<listitem>
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<simpara>
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<function>ibase_name_result</function> - Assigns a name to a result set
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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<function>ibase_num_params</function> - Return the number of parameters
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in a prepared query
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</simpara>
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</listitem>
|
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<listitem>
|
|
<simpara>
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|
<function>ibase_param_info</function> - Return information about a
|
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parameter in a prepared query
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|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_restore</function> - Initiates a restore task in the
|
|
service manager and returns immediately
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|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_rollback_ret</function> - Rollback transaction and
|
|
retain the transaction context
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_server_info</function> - Request statistics about a
|
|
database
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|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_service_attach</function> - Connect to the service manager
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_service_detach</function> - Disconnect from the
|
|
service manager
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_set_event_handler</function> - Register a callback
|
|
function to be called when events are posted
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|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ibase_wait_event</function> - Wait for an event to be posted
|
|
by the database
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para><link linkend="ref.iconv">iconv</link>:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_mime_decode</function> - Decodes a MIME header field
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_mime_decode_headers</function> - Decodes multiple MIME
|
|
header fields at once
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_mime_encode</function> - Composes a MIME header field
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_strlen</function> - Returns the character count of
|
|
string
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_strpos</function> - Finds position of first occurrence
|
|
of a needle within a haystack
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_strrpos</function> - Finds the last occurrence of a
|
|
needle within a haystack
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>iconv_substr</function> - Cut out part of a string
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para><link linkend="ref.stream">Streams</link>:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_copy_to_stream</function> - Copies data from one stream
|
|
to another
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_get_line</function> - Gets line from stream resource up
|
|
to a given delimiter
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_socket_accept</function> - Accept a connection on a
|
|
socket created by <function>stream_socket_server</function>
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_socket_client</function> - Open Internet or Unix domain
|
|
socket connection
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_socket_get_name</function> - Retrieve the name of the
|
|
local or remote sockets
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_socket_recvfrom</function> - Receives data from a
|
|
socket, connected or not
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_socket_sendto</function> - Sends a message to a socket,
|
|
whether it is connected or not
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>stream_socket_server</function> - Create an Internet or Unix
|
|
domain server socket
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para><link linkend="ref.datetime">Date and time related</link>:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<simpara>
|
|
<function>idate</function> - Format a local time/date as integer
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>date_sunset</function> - Time of sunset for a given day and
|
|
location
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>date_sunrise</function> - Time of sunrise for a given day and
|
|
location
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>time_nanosleep</function> - Delay for a number of seconds and
|
|
nanoseconds
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para><link linkend="ref.strings">Strings</link>:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<simpara>
|
|
<function>str_split</function> - Convert a string to an array
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>strpbrk</function> - Search a string for any of a set of
|
|
characters
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>substr_compare</function> - Binary safe optionally case
|
|
insensitive comparison of two strings from an offset, up to length
|
|
characters
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
<para>Other:</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<simpara>
|
|
<function>convert_uudecode</function> - decode a uuencoded string
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>convert_uuencode</function> - uuencode a string
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>curl_copy_handle</function> - Copy a cURL handle
|
|
along with all of its preferences
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>dba_key_split</function> - Splits a key in string
|
|
representation into array representation
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>dbase_get_header_info</function> - Get the header info of a
|
|
dBase database
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>dbx_fetch_row</function> - Fetches rows from a query-result
|
|
that had the DBX_RESULT_UNBUFFERED flag set
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>fbsql_set_password</function> - Change the password for a
|
|
given user
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>file_put_contents</function> - Write a string to a file
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ftp_alloc</function> - Allocates space for a file to be
|
|
uploaded
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>get_declared_interfaces</function> - Returns an array of all
|
|
declared interfaces
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>get_headers</function> - Fetches all the headers sent by the
|
|
server in response to a HTTP request
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>headers_list</function> - Returns a list of response headers
|
|
sent (or ready to send)
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>http_build_query</function> - Generate URL-encoded query string
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>image_type_to_extension</function> - Get file extension for
|
|
image-type returned by <function>getimagesize</function>,
|
|
<function>exif_read_data</function>,
|
|
<function>exif_thumbnail</function>,
|
|
<function>exif_imagetype</function>
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>imagefilter</function> - Applies a filter to an image using
|
|
custom arguments
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>imap_getacl</function> - Gets the ACL for a given mailbox
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>ldap_sasl_bind</function> - Bind to LDAP directory using SASL
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>mb_list_encodings</function> - Returns an array of all
|
|
supported encodings
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>pcntl_getpriority</function> - Get the priority of any
|
|
process
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>pcntl_wait</function> - Waits on or returns the status of a
|
|
forked child as defined by the waitpid() system call
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>pg_version</function> - Returns an array with client, protocol
|
|
and server version (when available)
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>php_check_syntax</function> - Check the syntax of the
|
|
specified file
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>php_strip_whitespace</function> - Return source with stripped
|
|
comments and whitespace
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>proc_nice</function> - Change the priority of the current
|
|
process
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>pspell_config_data_dir</function> - Change location of
|
|
language data files
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>pspell_config_dict_dir</function> - Change location of the
|
|
main word list
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>setrawcookie</function> - Send a cookie without URL-encoding
|
|
the value
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>scandir</function> - List files and directories inside the
|
|
specified path
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>snmp_read_mib</function> - Reads and parses a MIB file into
|
|
the active MIB tree
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<function>sqlite_fetch_column_types</function> - Return an array of
|
|
column types from a particular table
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
<note>
|
|
<para>
|
|
The <link linkend="ref.tidy">Tidy</link> extension has also changed its
|
|
API completely.
|
|
</para>
|
|
</note>
|
|
</section>
|
|
|
|
|
|
<section id="migration5.newconf">
|
|
<title>New Directives</title>
|
|
<para>
|
|
There were some new &php.ini; directives introduced in PHP 5. Here is a
|
|
list of them:
|
|
</para>
|
|
<itemizedlist>
|
|
<listitem>
|
|
<simpara>
|
|
mail.force_extra_parameters - Force the addition of the specified
|
|
parameters to be passed as extra parameters to the sendmail binary.
|
|
These parameters will always replace the value of the 5th parameter to
|
|
<function>mail</function>, even in safe mode
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<link linkend="ini.register-long-arrays">register_long_arrays</link> -
|
|
allow/disallow PHP to register the deprecated long $HTTP_*_VARS
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<link linkend="ini.session.hash-function">session.hash_function</link> -
|
|
select a hash function (MD5 or SHA-1)
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<link
|
|
linkend="ini.session.hash-bits-per-character">session.hash_bits_per_character</link>
|
|
- define how many bits are stored in each character when converting the
|
|
binary hash data to something readable (from 4 to 6)
|
|
</simpara>
|
|
</listitem>
|
|
<listitem>
|
|
<simpara>
|
|
<link linkend="ini.zend.ze1-compatibility-mode">zend.ze1_compatibility_mode</link>
|
|
- Enable compatibility mode with Zend Engine 1 (PHP 4)
|
|
</simpara>
|
|
</listitem>
|
|
</itemizedlist>
|
|
</section>
|
|
|
|
<section id="migration5.databases">
|
|
<title>Databases</title>
|
|
<para>
|
|
There were some changes in PHP 5 regarding databases (MySQL and SQLite).
|
|
</para>
|
|
<para>
|
|
In PHP 5 the MySQL client libraries are not bundled, because of license
|
|
problems and some others. For more information, read the <link
|
|
linkend="faq.databases.mysql.php5">FAQ entry</link>.
|
|
</para>
|
|
<para>
|
|
There is also a new extension, <link linkend="ref.mysqli">MySQLi (Improved
|
|
MySQL)</link>, which is designed to work with MySQL 4.1 and above.
|
|
</para>
|
|
<para>
|
|
Since PHP 5, the <link linkend="ref.sqlite">SQLite</link> extension is
|
|
built-in PHP. SQLite is an embeddable SQL database engine and is not a
|
|
client library used to connect to a big database server (like MySQL or
|
|
PostgreSQL). The SQLite library reads and writes directly to and from the
|
|
database files on disk.
|
|
</para>
|
|
</section>
|
|
|
|
|
|
<section id='migration5.oop'>
|
|
<title>New Object Model</title>
|
|
<para>
|
|
In PHP 5 there is a new Object Model. PHP's handling of objects has been
|
|
completely rewritten, allowing for better performance and more features.
|
|
In previous versions of PHP, objects were handled like primitive types
|
|
(for instance integers and strings). The drawback of this method was that
|
|
semantically the whole object was copied when a variable was assigned, or
|
|
passed as a parameter to a method. In the new approach, objects are
|
|
referenced by handle, and not by value (one can think of a handle as an
|
|
object's identifier).
|
|
</para>
|
|
<para>
|
|
Many PHP programmers aren't even aware of the copying quirks of the old
|
|
object model and, therefore, the majority of PHP applications will work
|
|
out of the box, or with very few modifications.
|
|
</para>
|
|
<para>
|
|
The new Object Model is documented at the <link
|
|
linkend="language.oop5">Language Reference</link>.
|
|
</para>
|
|
<para>
|
|
See also the <link linkend="ini.zend.ze1-compatibility-mode">
|
|
zend.ze1_compatibility_mode</link> directive for compatability with
|
|
PHP 4.
|
|
</para>
|
|
</section>
|
|
|
|
<section id='migrating5.errorrep'>
|
|
<title>Error Reporting</title>
|
|
<para>
|
|
As of PHP 5 new error reporting constant E_STRICT was introduced with
|
|
value 2048. It enables run-time PHP suggestions on your code
|
|
interoperability and forward compatibility, that will help you to keep
|
|
latest and greatest suggested method of coding. E.g. STRICT message will
|
|
warn you on using deprecated functions.
|
|
</para>
|
|
<note>
|
|
<simpara>
|
|
E_ALL does not include E_STRICT so it's not enabled by default
|
|
</simpara>
|
|
</note>
|
|
</section>
|
|
|
|
</appendix>
|
|
|
|
|
|
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|
|
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|
|
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|
|
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|
|
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|
|
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|
|
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|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"../../manual.ced"
|
|
sgml-exposed-tags:nil
|
|
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|
|
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|
|
End:
|
|
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|
|
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|
|
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|
|
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|