The ReflectionClass::isInternal() function is an inbuilt function in PHP which is used to check if class is defined internally by an extension, or the core.
Syntax:
bool ReflectionClass::isInternal( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns TRUE if the class is defined internally by an extension, otherwise FALSE.
Below programs illustrate the ReflectionClass::isInternal() function in PHP:
Program 1:
<?php   // Initializing a user-defined class Departments class Departments {     public function CSE() {} }   // Using ReflectionClass() over the // user-defined class Departments $class = new ReflectionClass('Departments');   // Calling the isInternal() function $instance = $class->isInternal();   // Getting the value true or false var_dump($instance); ?> |
Output:
bool(false)
Program 2:
<?php   // Using ReflectionClass internally $InternalClass = new ReflectionClass('ReflectionClass');   // Calling the isInternal() function and // getting the value true or false var_dump($InternalClass->isInternal()); ?> |
Output:
bool(true)
Reference: https://www.php.net/manual/en/reflectionclass.isinternal.php
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