The is_callable Function

The is_callable function checks if the passed value is callable. The first parameter accepts the value to check, the second parameter (optional) is a flag for syntactic name checking, and the third (optional) is a string to store the callable name.

Syntax

is_callable(mixed $value, bool $syntax_only = false, string &$callable_name = null): bool

Example

Let's check a regular function:

<?php
	function test() {}
	$res = is_callable('test');
	var_dump($res);
?>

Code execution result:

true

Example

Let's check a class method:

<?php
	class MyClass {
		public function method() {}
	}
	$obj = new MyClass();
	$res = is_callable([$obj, 'method']);
	var_dump($res);
?>

Code execution result:

true

Example

Let's check a non-existent function:

<?php
	$res = is_callable('non_existent_function');
	var_dump($res);
?>

Code execution result:

false

Example

Using the third parameter to get the name:

<?php
	function myFunction() {}
	$name = '';
	$res = is_callable('myFunction', false, $name);
	echo $name;
?>

Code execution result:

'myFunction'

The is_callable Function

Syntax

Example

Example

Example

Example

See Also