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https://github.com/sigmasternchen/php-doc-en
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a6a4d6ad6e
Similar to PR 938 for the PHP 8.0 `mixed` reserved word, this commit adds the new reserved word `never` to the list of "Other reserved words" and adds a mention of this to the Backward Incompatible Changes page in the migration guide. Co-authored-by: jrfnl <jrfnl@users.noreply.github.com> Closes GH-1434.
410 lines
13 KiB
XML
410 lines
13 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<sect1 xml:id="migration81.incompatible" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Backward Incompatible Changes</title>
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<sect2 xml:id="migration81.incompatible.core">
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<title>PHP Core</title>
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<sect3 xml:id="migration81.incompatible.core.globals-access">
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<title>$GLOBALS Access Restrictions</title>
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<para>
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Access to the <varname>$GLOBALS</varname> array is now subject to
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a number of restrictions.
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Read and write access to individual array elements like
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<code>$GLOBALS['var']</code> continues to work as-is.
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Read-only access to the entire <varname>$GLOBALS</varname> array also
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continues to be supported.
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However, write access to the entire <varname>$GLOBALS</varname> array
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is no longer supported. For example, <code>array_pop($GLOBALS)</code>
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will result in an error.
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</para>
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</sect3>
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<sect3 xml:id="migration81.incompatible.core.static-variable-inheritance">
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<title>
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Usage of <modifier>static</modifier> Variables in Inherited Methods
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</title>
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<para>
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When a method using static variables is inherited (but not overridden), the
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inherited method will now share static variables with the parent method.
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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class A {
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public static function counter() {
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static $counter = 0;
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$counter++;
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return $counter;
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}
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}
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class B extends A {}
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var_dump(A::counter()); // int(1)
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var_dump(A::counter()); // int(2)
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var_dump(B::counter()); // int(3), previously int(1)
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var_dump(B::counter()); // int(4), previously int(2)
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?>
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]]>
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</programlisting>
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</informalexample>
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This means that static variables in methods now behave the same way as
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static properties.
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</para>
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</sect3>
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<sect3 xml:id="migration81.incompatible.core.optional-before-required">
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<title>Optional parameters specified before required parameters</title>
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<para>
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An <link linkend="functions.arguments.default">optional parameter</link>
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specified before required parameters is now always treated as required,
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even when called using
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<link linkend="functions.named-arguments">named arguments</link>.
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As of PHP 8.0.0, but prior to PHP 8.1.0, the below emits a deprecation notice
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on the definition, but runs successfully when called. As of PHP 8.1.0, an error
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of class <classname>ArgumentCountError</classname> is thrown, as it would be when
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called with positional arguments.
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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function makeyogurt($container = "bowl", $flavour)
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{
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return "Making a $container of $flavour yogurt.\n";
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}
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try
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{
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echo makeyogurt(flavour: "raspberry");
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}
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catch (Error $e)
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{
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echo get_class($e), ' - ', $e->getMessage(), "\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs.80;
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<screen>
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<![CDATA[
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Deprecated: Required parameter $flavour follows optional parameter $container
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in example.php on line 3
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Making a bowl of raspberry yogurt.
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]]>
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</screen>
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&example.outputs.81;
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<screen>
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<![CDATA[
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Deprecated: Optional parameter $container declared before required parameter
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$flavour is implicitly treated as a required parameter in example.php on line 3
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ArgumentCountError - makeyogurt(): Argument #1 ($container) not passed
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]]>
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</screen>
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</informalexample>
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</para>
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<para>
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Note that a default value of &null; can be used before required parameters to
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specify a <link linkend="language.types.declarations.nullable">nullable type</link>,
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but the parameter will still be required.
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</para>
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</sect3>
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<sect3 xml:id="migration81.incompatible.core.type-compatibility-internal">
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<title>Return Type Compatibility with Internal Classes</title>
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<para>
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Most non-final internal methods now require overriding methods to declare
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a compatible return type, otherwise a deprecated notice is emitted during
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inheritance validation.
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In case the return type cannot be declared for an overriding method due to
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PHP cross-version compatibility concerns,
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a <code>#[ReturnTypeWillChange]</code> attribute can be added to silence
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the deprecation notice.
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</para>
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</sect3>
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<sect3 xml:id="migration81.incompatible.core.new-keywords">
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<title>New Keywords</title>
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<para>
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<literal>readonly</literal> is a keyword now. However, it still may be used
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as function name.
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</para>
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<para>
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<literal>never</literal> is now a reserved word, so it cannot be used to name a class,
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interface or trait, and is also prohibited from being used in namespaces.
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</para>
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</sect3>
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</sect2>
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<sect2 xml:id="migration81.incompatible.resource2object">
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<title>Resource to Object Migration</title>
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<para>
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Several &resource;s have been migrated to &object;s.
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Return value checks using <function>is_resource</function> should be replaced with checks for &false;.
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</para>
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<itemizedlist>
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<listitem>
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<para>
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The <link linkend="book.fileinfo">FileInfo</link> functions now accept and return
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<classname>finfo</classname> objects instead of
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<literal>fileinfo</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.ftp">FTP</link> functions now accept and return
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<classname>FTP\Connection</classname> objects instead of
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<literal>ftp</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.imap">IMAP</link> functions now accept and return
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<classname>IMAP\Connection</classname> objects instead of
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<literal>imap</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.ldap">LDAP</link> functions now accept and return
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<classname>LDAP\Connection</classname> objects instead of
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<literal>ldap link</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.ldap">LDAP</link> functions now accept and return
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<classname>LDAP\Result</classname> objects instead of
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<literal>ldap result</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.ldap">LDAP</link> functions now accept and return
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<classname>LDAP\ResultEntry</classname> objects instead of
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<literal>ldap result entry</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.pgsql">PgSQL</link> functions now accept and return
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<classname>PgSql\Connection</classname> objects instead of
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<literal>pgsql link</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.pgsql">PgSQL</link> functions now accept and return
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<classname>PgSql\Result</classname> objects instead of
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<literal>pgsql result</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.pgsql">PgSQL</link> functions now accept and return
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<classname>PgSql\Lob</classname> objects instead of
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<literal>pgsql large object</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.pspell">PSpell</link> functions now accept and return
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<classname>PSpell\Dictionary</classname> objects instead of
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<literal>pspell</literal> &resource;s.
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</para>
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</listitem>
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<listitem>
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<para>
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The <link linkend="book.pspell">PSpell</link> functions now accept and return
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<classname>PSpell\Config</classname> objects instead of
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<literal>pspell config</literal> &resource;s.
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</para>
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</listitem>
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</itemizedlist>
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</sect2>
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<sect2 xml:id="migration81.incompatible.mysqli">
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<title>MySQLi</title>
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<para>
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<function>mysqli_fetch_fields</function>, and
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<function>mysqli_fetch_field_direct</function> will now always return
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<literal>0</literal> for the <property>max_length</property>.
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This information can be computed by iterating over the result set,
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and taking the maximum length. This is what PHP was doing
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internally previously.
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</para>
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<para>
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The <constant>MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH</constant>
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option no longer has any effect.
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</para>
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<para>
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The <constant>MYSQLI_STORE_RESULT_COPY_DATA</constant>
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option no longer has any effect. Passing any value to the
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<parameter>mode</parameter> parameter of
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<methodname>mysqli::store_result</methodname> no longer has any effect.
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</para>
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<para>
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<methodname>mysqli::connect</methodname> now returns &true; instead of &null; on success.
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</para>
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<para>
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The default error handling mode has been changed from "silent" to "exceptions"
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See the <link linkend="mysqli-driver.report-mode">MySQLi reporting mode</link>
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page for more details on what this entails,
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and how to explicitly set this attribute.
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To restore the previous behaviour use:
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<code>mysqli_report(MYSQLI_REPORT_OFF);</code>
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</para>
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<para>
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Classes extending <methodname>mysqli_stmt::execute</methodname>
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are now required to specify the additional optional parameter.
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</para>
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</sect2>
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<sect2 xml:id="migration81.incompatible.mysqlnd">
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<title>MySQLnd</title>
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<para>
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The <link linkend="ini.mysqlnd.fetch_data_copy">mysqlnd.fetch_data_copy</link>
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INI directive has been removed.
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This should not result in user-visible behavior changes.
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</para>
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</sect2>
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<sect2 xml:id="migration81.incompatible.openssl">
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<title>OpenSSL</title>
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<para>
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EC private keys will now be exported in PKCS#8 format rather than
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traditional format, just like all other keys.
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</para>
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<para>
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<function>openssl_pkcs7_encrypt</function> and
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<function>openssl_cms_encrypt</function> will now to default using
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AES-128-CBC rather than RC2-40. The RC2-40 cipher is considered
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insecure and not enabled by default by OpenSSL 3.
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</para>
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</sect2>
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<sect2 xml:id="migration81.incompatible.pdo">
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<title>PHP Data Objects</title>
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<para>
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<constant>PDO::ATTR_STRINGIFY_FETCHES</constant> now stringifies values
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of type &boolean; to <literal>"0"</literal> or
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<literal>"1"</literal>. Previously &boolean;s were not stringified.
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</para>
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<para>
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Calling <methodname>PDOStatement::bindColumn</methodname> with
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<constant>PDO::PARAM_LOB</constant> will now constantly bind a stream
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result when <constant>PDO::ATTR_STRINGIFY_FETCHES</constant> is not enabled.
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Previously, the result would either be a stream or a string depending on
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the used database driver and the time the binding is performed.
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</para>
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<sect3 xml:id="migration81.incompatible.pdo.mysql">
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<title>MySQL Driver</title>
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<para>
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Integers and floats in result sets will now be returned using native
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PHP types instead of &string;s when using emulated prepared statements.
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This matches the behavior of native prepared statements.
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The previous behaviour can be restored by enabling the
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<constant>PDO::ATTR_STRINGIFY_FETCHES</constant> option.
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</para>
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</sect3>
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<sect3 xml:id="migration81.incompatible.pdo.sqlite">
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<title>SQLite Driver</title>
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<para>
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Integers and floats in results sets will now be returned using native
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PHP types.
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The previous behaviour can be restored by enabling the
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<constant>PDO::ATTR_STRINGIFY_FETCHES</constant> option.
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</para>
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</sect3>
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</sect2>
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<sect2 xml:id="migration81.incompatible.phar">
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<title>Phar</title>
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<para>
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To comply with the <interfacename>ArrayAccess</interfacename> interface,
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<methodname>Phar::offsetUnset</methodname> and
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<methodname>PharData::offsetUnset</methodname> no longer return a &boolean;.
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</para>
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</sect2>
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<sect2 xml:id="migration81.incompatible.standard">
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<title>Standard</title>
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<para>
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<function>version_compare</function> no longer accepts undocumented operator abbreviations.
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</para>
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<para>
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<function>htmlspecialchars</function>,
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<function>htmlentities</function>,
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<function>htmlspecialchars_decode</function>,
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<function>html_entity_decode</function>,
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and <function>get_html_translation_table</function>
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now use <literal>ENT_QUOTES | ENT_SUBSTITUTE</literal> rather than
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<constant>ENT_COMPAT</constant> by default.
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This means that <literal>'</literal> is escaped to
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<literal>&#039;</literal> while previously nothing was done.
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Additionally, malformed UTF-8 will be replaced by a Unicode substitution
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character, instead of resulting in an empty string.
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</para>
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<para>
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<function>debug_zval_dump</function> now prints the refcount of a reference
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wrappers with their refcount, instead of only prepending
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<literal>&</literal> to the value.
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This more accurately models reference representation since PHP 7.0.
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</para>
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<para>
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<function>debug_zval_dump</function> now prints <literal>interned</literal>
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instead of a dummy refcount for interned strings and immutable arrays.
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</para>
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</sect2>
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<sect2 xml:id="migration81.incompatible.spl">
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<title>Standard PHP Library (SPL)</title>
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<para>
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<classname>SplFixedArray</classname>, will now be JSON encoded like an &array;
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</para>
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</sect2>
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</sect1>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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