PHP | is_a() function

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
// PHP program to illustrate the 
// is_a() function

// sample class
class GeeksforGeeks
{
    var $store = 'geek';
}

// create a new object
$geek = new GeeksforGeeks();

// checks if $geek is an object
// of class GeeksforGeeks
if (is_a($geek, 'GeeksforGeeks')) 
{
    echo "YES";
}

?>

Output:

YES

Program 2: php

<?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