The is_a() is a built-in function in PHP and is used to check whether a given object is of a given class or not. It also checks if the given class is one of the parents of the given object or not.
Syntax:
boolean is_a($object, $class)
Parameters: This function accepts two parameters as shown in the above syntax and explained below:
- $object: The given object to be tested.
- $class: The name of the class.
Return Type: It returns TRUE if the object given by the parameter $object is of $class or has this $class as one of its parents otherwise it returns FALSE.
Below programs illustrate the is_a() function:
Program 1:
<?php // PHP program to illustrate the // is_a() function // sample class class neveropen { var $store = 'geek'; } // create a new object $geek = new neveropen(); // checks if $geek is an object // of class neveropen if (is_a($geek, 'neveropen')) { echo "YES"; } ?> |
Output:
YES
Program 2:
<?php // PHP program to illustrate the // is_a() function interface parentClass { public function A(); } class childClass implements parentClass { public function A () { print "A"; } } $object = new childClass(); if(is_a($object, 'parentClass')) { echo "YES"; } else{ echo "NO"; } ?> |
Output:
YES
Reference:
http://php.net/manual/en/function.is-a.php
