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added describtion for unserialize_callback_function
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@64368 c90b9560-bf6c-de11-be94-00142212c4b1
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@ -1,5 +1,5 @@
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.79 $ -->
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<!-- $Revision: 1.80 $ -->
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<reference id="ref.variables">
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<title>Variable Functions</title>
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<titleabbrev>Variables</titleabbrev>
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@ -1150,16 +1150,42 @@ settype($bar, "string"); // $bar is now "1" (string)
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If an object was serialized, its methods are not preserved in the
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returned value.
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</simpara>
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<note>
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<para>
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In PHP 3, methods are not preserved when unserializing a
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serialized object. PHP 4 removes that limitation and restores
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both properties and methods. Please see the <link
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linkend="language.oop.serialization">Serializing Objects</link>
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section of <link linkend="language.oop">Classes and
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Objects</link> or more information.
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</para>
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</note>
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<simpara>
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It's possible to set a callback-function which will be called,
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if an undefined class should be instanciated during unserializing.
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(to prevent getting an incomplete <type>object</type> "__PHP_Incomplete_Class".)
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Use your php.ini, <function>ini_set</function> or .htaccess-file
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to define 'unserialize_callback_func'.
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Everytime an undefined class should be instanciated, it'll be called.
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To disable this feature just empty this global variable.
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<para>
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<example>
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<title>unserialize_callback_func example</title>
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<programlisting role="php">
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<![CDATA[
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$serialized_object='O:1:"a":1:{s:5:"value";s:3:"100";}';
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ini_set('unserialize_callback_func','mycallback'); // set your callback_function
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function mycallback($classname) {
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// just include a file containing your classdefinition
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// you get $classname to figure out which classdefinition is required
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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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</simpara>
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<note>
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<para>
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In PHP 3, methods are not preserved when unserializing a
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serialized object. PHP 4 removes that limitation and restores
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both properties and methods. Please see the <link
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linkend="language.oop.serialization">Serializing Objects</link>
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section of <link linkend="language.oop">Classes and
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Objects</link> or more information.
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</para>
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</note>
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<para>
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<example>
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<title><function>unserialize</function> example</title>
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