The is_a Function

The is_a function takes an object and a class name, returning true if the object is an instance of that class or its descendant. The third parameter can specify whether to consider inheritance (default is true).

Syntax

is_a(object, class_name, allow_string = true);

Example

Let's check if the object belongs to the stdClass class:

<?php
	$obj = new stdClass();
	var_dump(is_a($obj, 'stdClass'));
?>

Code execution result:

true

Example

Let's check class inheritance:

<?php
	class ParentClass {}
	class ChildClass extends ParentClass {}
	
	$child = new ChildClass();
	var_dump(is_a($child, 'ParentClass'));
?>

Code execution result:

true

Example

Let's check the work with interfaces:

<?php
	interface MyInterface {}
	class MyClass implements MyInterface {}
	
	$obj = new MyClass();
	var_dump(is_a($obj, 'MyInterface'));
?>

Code execution result:

true

The is_a Function

Syntax

Example

Example

Example

See Also