PHP | ReflectionClass inNamespace() Function

Last Updated : 17 Dec, 2019
The ReflectionClass::inNamespace() function is an inbuilt function in PHP which is used to check the existence of the namespace. It returns true for the success or false on failure. Syntax: 
bool ReflectionClass::inNamespace( void )
Parameters: This function does not accept any parameters. Return Value: This function returns true for the success or false on failure. Below programs illustrate the ReflectionClass::inNamespace() function in PHP: Program 1: php 
<?php

// Defining a namespace and class GFG
namespace A\B;
class GFG{ } 
 
// Using ReflectionClass over the namespace and
// specified class GFG
$ReflectionClass = new \ReflectionClass('A\\B\\GFG');
 
// Calling inNamespace() function 
$A = $ReflectionClass->inNamespace();
 
// Getting the value true or false
var_dump($A);
?>
Output: 
bool(true)
Program 2: php 
<?php
  
// Using ReflectionClass over the inbuilt 
// class 'stdClass'
$ReflectionClass = new ReflectionClass('stdClass');
  
// Calling inNamespace() function 
$A = $ReflectionClass->inNamespace();
  
// Getting the value true or false
var_dump($A);
?>
Output: 
bool(false)
Reference: https://www.php.net/manual/en/reflectionclass.innamespace.php
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