cvs: phpdoc /en/reference/classobj/functions class-exists.xml

curt Thu Jul 1 23:03:52 2004 EDT Modified files: /phpdoc/en/reference/classobj/functions class-exists.xml Log: Define php5 autoload behaviour, Closes bug #28333. And Example. http://cvs.php.net/diff.php/phpdoc/en/reference/classobj/functions/class-exists.xml?r1=1.3&r2=1.4&ty=u Index: phpdoc/en/reference/classobj/functions/class-exists.xml diff -u phpdoc/en/reference/classobj/functions/class-exists.xml:1.3 phpdoc/en/reference/classobj/functions/class-exists.xml:1.4 --- phpdoc/en/reference/classobj/functions/class-exists.xml:1.3 Mon Oct 21 09:41:39 2002 +++ phpdoc/en/reference/classobj/functions/class-exists.xml Thu Jul 1 23:03:52 2004 @@ -1,5 +1,5 @@ <?xml version="1.0" encoding="iso-8859-1"?> -<!-- $Revision: 1.3 $ --> +<!-- $Revision: 1.4 $ --> <!-- splitted from ./en/functions/classobj.xml, last change in rev 1.11 --> <refentry id="function.class-exists"> <refnamediv> @@ -11,11 +11,47 @@ <methodsynopsis> <type>bool</type><methodname>class_exists</methodname> <methodparam><type>string</type><parameter>class_name</parameter></methodparam> + <methodparam choice="opt"><type>bool</type><parameter>autoload</parameter></methodparam> </methodsynopsis> + <note> + <para> + The <parameter>autoload</parameter> parameter was added in PHP 5 + </para> + </note> <para> This function returns &true; if the class given by <parameter>class_name</parameter> has been defined, &false; otherwise. + </para> + <para> + <function>class_exists</function> will attempt to call __autoload by + default, if you don't want <function>class_exists</function> to + call __autoload(), you can set the paramater <parameter>autoload</parameter> + to &false;. + </para> + <para> + <example> + <title><parameter>autoload</parameter> parameter example</title> + <programlisting role="php"> +<![CDATA[ +<?php + function __autoload($class) { + include($class . '.php'); + + /* Check to see it the include defined the class */ + if ( !class_exists($class, false) ) { + trigger_error("Unable to load class $class", E_USER_ERROR); + } + } + + if( class_exists('MyClass') ) { + $myclass = new MyClass(); + } + +?> +]]> + </programlisting> + </example> </para> <simpara> See also <function>get_declared_classes</function>.