The class_exists() function is an inbuilt function in PHP which is used to check whether the given class is defined or not.
Syntax:
bool class_exists( string $class_name, bool $autoload = TRUE )
Parameters: This function accept two parameters as mentioned above and described below:
- $class_name: It holds the class name which need to check their existence.
- $autoload: It checks whether the __autoload is called or not by default.
Return Value: This function returns True if class name is defined otherwise returns False.
Below programs illustrate the class_exists() function in PHP:
Program 1:
<?php // Create a class class GFG { public $Geek_name = "Welcome to neveropen"; } // Check class name exist or not if(class_exists('GFG')) { echo "Class name exists"; } else { echo "Class name does not exist"; } ?> |
Output:
Class name exists
Program 2:
<?php // Creating class class GFG { public $data1; public $data2; public $data3; } if(class_exists('GFG')) { // Creating an object $obj = new GFG(); // Set values of $obj object $obj->data1 = "Geeks"; $obj->data2 = "for"; $obj->data3 = "Geeks"; // Print values of $obj object echo "$obj->data1 \n$obj->data2 \n$obj->data3"; } else { echo "Class does not exist"; } ?> |
Output:
Geeks for Geeks
Reference: https://www.php.net/manual/en/function.class-exists.php
