Checks if the interface has been defined (PHP 5 >= 5.0.2)
bool interface_exists ( string interface_name [, bool autoload] )

This function returns TRUE if the interface given by interface_name has been defined, FALSE otherwise.

例 354. interface_exists() example

// Check the interface exists before trying to use it
if (interface_exists('MyInterface')) {
MyClass implements MyInterface
// Methods


interface_exists() will attempt to call __autoload by default, if you don't want interface_exists() to call __autoload, you can set the parameter autoload to FALSE.

See also class_exists().