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Using the class_exists Function

Published : November 22, 2014   •   Last Edited : November 24, 2025   •   Author : Adam Khoury
The class_exists() function is used to determine whether or not a class is defined in the script. It returns a boolean value of either TRUE or FALSE. demo.php 
<?php
include_once("cart.php");
if(class_exists("cart")){
    $shopping_cart = new cart();
    echo $shopping_cart->store;
} else {
    echo '"cart" class does not exist';
}
?>
cart.php 
<?php
class cart {
    public $store = "Spacely Sprockets";
    public $items = array();
}
?>
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