The interface_exists() function checks if the interface has been defined. It returns TRUE if the interface given by name_of_interface has been defined, else FALSE is returned.
Syntax
interface_exists(name_of_interface, autoload)
Parameters
name_of_interface − The interface name.
autoload − To call __autoload or not by default
Return
The interface_exists() function returns TRUE if the interface given by name_of_interface has been defined. It returns FALSE otherwise.
Example
The following is an example −
<?php
if (interface_exists('DemoInterface')) {
class MyClass implements DemoInterface {
// Methods
}
}
?>