class_exists() function in PHP

The class_exists() function in PHP checks if the class has been defined. It returns TRUE if class is a defined class, else it returns FALSE.

Syntax

class_exists(class, autoload)

Parameters

• class − Name of the class.

• autoload − Whether to call __autoload or not by default

Return

The class_exists() function returns TRUE if class is a defined class, else it returns FALSE.

Example

The following is an example −

 Live Demo

<?php
if (class_exists('Demo')) {
   $demo = new Demo();
   echo "Our class!";
} else {
   echo "Class does not exist";
}
?>

Output

The following is the output −

Class does not exist!