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added backward incompatible changes. Missing some examples for clarification now

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@150186 c90b9560-bf6c-de11-be94-00142212c4b1
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Nuno Lopes 2004-01-30 23:14:46 +00:00
parent aca706a4e2
commit 7c342c241d
1 changed files with 49 additions and 4 deletions
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53
appendices/migration5.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.1 $ -->
<!-- $Revision: 1.2 $ -->
<appendix id="migration5">
<title>Migrating from PHP 4 to PHP 5</title>
@ -20,9 +20,54 @@
<section id="migration5.incompatible">
<title>Backward Incompatible Changes</title>
<para>
Although most existing PHP 4 code should work without changes, you shoud
pay attention to this backward imcompatible changes:
</para>
Although most existing PHP 4 code should work without changes, you should
pay attention to this backward imcompatible changes:
</para>
<itemizedlist>
<listitem><simpara>
<function>strrpos</function> and <function>strripos</function> now use
the entire string as a needle.
</simpara></listitem>
<listitem><simpara>
Ilegal use of string offsets causes <constant>E_ERROR</constant> instead
of <constant>E_WARNING</constant>.
</simpara></listitem>
<listitem><simpara>
<function>array_merge</function> was changed to accept only arrays. If a
non-array variable is passed, a <constant>E_WARNING</constant> will be
thrown for every such parameter. Be careful because your code may start
emitting <constant>E_WARNING</constant> out of the blue.
</simpara></listitem>
<listitem><simpara>
PATH_TRANSLATED server variable is no longer set implicitly under
Apache2 SAPI in contrast to the situation in PHP 4, where it is set to
the same value as the SCRIPT_FILENAME server variable when it is not
populated by Apache. This change was made to comply with the <ulink
url="&url.cgispecs;">CGI specification</ulink>. Please refer to <ulink
url="&url.php.bugs;23610">bug #23610</ulink> for further information.
</simpara></listitem>
<listitem><simpara>
The <constant>T_ML_CONSTANT</constant> constant is no longer defined by
the <link linkend="ref.tokenizer">Tokenizer</link> extension. If
error_reporting is set to <constant>E_ALL</constant>, PHP will generate a
notice. Instead of <constant>T_ML_CONSTANT</constant> for /* */ the
<constant>T_COMMENT</constant> constant is used, thus both // and /* */
are resolved as the <constant>T_COMMENT</constant> constant. However the
PHPDoc style comments /** */ ,which starting PHP5 are parsed by PHP, are
recongnized as <constant>T_DOC_COMMENT</constant>.
</simpara></listitem>
<listitem><simpara>
$_SERVER should be populated with argc and argv if variables_order
includes "S". If you have specifically configured your system to not
create $_SERVER, then of course it shouldn't be there. The change was to
always make argc and argv available in the CLI version regardless of the
variables_order setting. As in, the CLI version will now always populate
the global $argc and $argv variables.
</simpara></listitem>
<listitem><simpara>
Classes must be declared before used.
</simpara></listitem>
</itemizedlist>
</section>
</appendix>