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SJS PHP Class: Release 1.0
10-13-2008
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CLASS_EXISTS(3) 1 CLASS_EXISTS(3) class_exists - Checks if the class has been defined SYNOPSIS
bool class_exists (string $class_name, [bool $autoload = true]) DESCRIPTION
This function checks whether or not the given class has been defined. PARAMETERS
o $class_name - The class name. The name is matched in a case-insensitive manner. o $autoload - Whether or not to call __autoload by default. RETURN VALUES
Returns TRUE if $class_name is a defined class, FALSE otherwise. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.0.2 | | | | | | | No longer returns TRUE for defined interfaces. | | | Use interface_exists(3). | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 class_exists(3) example <?php // Check that the class exists before trying to use it if (class_exists('MyClass')) { $myclass = new MyClass(); } ?> Example #2 $autoload parameter example <?php function __autoload($class) { include($class . '.php'); // Check to see whether the include declared the class if (!class_exists($class, false)) { trigger_error("Unable to load class: $class", E_USER_WARNING); } } if (class_exists('MyClass')) { $myclass = new MyClass(); } ?> SEE ALSO
function_exists(3), interface_exists(3), get_declared_classes(3). PHP Documentation Group CLASS_EXISTS(3)