PHP | ReflectionClass isUserDefined() Function

Last Updated : 19 Feb, 2021

The ReflectionClass::isUserDefined() function is an inbuilt function in PHP which is used to check if any user-defined class is available or not.
Syntax: 
 

bool ReflectionClass::isUserDefined()


Parameters: This function does not accept any parameter.
Return Value: This function returns TRUE if the user-defined class is available, otherwise FALSE.
Below programs illustrate the ReflectionClass::isUserDefined() function in PHP: 
Program 1: 
 

php 
<?php
 
// Defining user-defined class Company
Class Company {
    public function GeeksforGeeks() {
    }
}
 
// Using ReflectionClass over the
// defined class 
$obj=new ReflectionClass('Company');
 
// Calling the isUserDefined() function
$A = $obj->isUserDefined();
 
// Getting the value true or false
var_dump($A); 
?>

Output: 
 

bool(true)


Program 2: 
 

php 
<?php
 
// Using a internal class 'ReflectionClass'
$obj=new ReflectionClass('ReflectionClass');
 
// Calling the isUserDefined() function
$A = $obj->isUserDefined();
 
// Getting the value true or false
var_dump($A); 
?>

Output: 
 

bool(false)


Reference: https://www.php.net/manual/en/reflectionclass.isuserdefined.php
 

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