The interface_exists() function is an inbuilt function in PHP that checks interface is defined or not.
Syntax:
bool interface_exists(string $interface, bool $autoload = true)
Parameters: This function accept two parameters that are described below:
- $interface: This parameter holds the interface name.
- $autoload: This parameter checks whether to call autoload or not by default.
Return Value: If the given interface is defined, then it returns “true”, otherwise it will return “false”.
Example 1: In this example, we will check interface is defined or not by using the interface_exists() function.
PHP
<?php if (interface_exists('MyInterface')) { class MyClass implements MyInterface { } echo "A class using 'Interface' is created."; } else { echo "'Interface' do not exist!."; }?> |
Output:
'Interface' does not exist!
Example 2: In the below code example, we will define an interface and then use the interface_exists() function.
PHP
<?php interface MyInterface{ public function hello() ; } if (interface_exists('MyInterface')) { class MyClass implements MyInterface { function hello(){ echo "Hey neveropen"; } } echo "A class using 'Interface' is created.\n"; } else { echo "'Interface' does not exist!."; } $MyInterface = new MyClass() ; $MyInterface->hello() ;?> |
Output:
A class using 'Interface' is created. Hey neveropen
Reference: https://www.php.net/manual/en/function.interface-exists.php
