The interface_exists Function
The interface_exists function checks if the specified interface exists in the current scope. Its first parameter is the interface name as a string, the second optional parameter is a flag indicating whether to use autoloading.
Syntax
interface_exists(string $interface, bool $autoload = true): bool
Example
Let's check the existence of the 'Countable' interface:
<?php
$res = interface_exists('Countable');
var_dump($res);
?>
Code execution result:
true
Example
Let's check the existence of a non-existing interface:
<?php
$res = interface_exists('NonExistingInterface');
var_dump($res);
?>
Code execution result:
false
Example
Let's check the existence of an interface with autoloading disabled:
<?php
$res = interface_exists('Iterator', false);
var_dump($res);
?>
Code execution result:
true
See Also
-
the class_exists function,
which checks a class -
the trait_exists function,
which checks a trait -
the get_declared_interfaces function,
which returns interfaces -
the class_implements function,
which returns class interfaces
