PHP class_exists() function

This function is used to check whether the class name is exist or not.

Syntax

class_exists(classname);

It takes the class name as parameter and returns a boolean value. It returns true if the class is already exists and false if it does not exist.

Example1

<?php
    class Demo {
        function welcome(){
            echo 'Hello World';
        }
    }
    if(class_exists(Demo)) {
        $obj = new Demo();
        $obj->welcome();
    }
    else{
        echo 'Class is not defined.';
    }
?>		

Output :

Hello World

Example2

<?php
    if(class_exists(Student)) {
        $obj = new Student();
        $obj->welcome();
    }
    else{
        echo 'Class is not defined.';
    }
?>		

Output :

Class is not defined.



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