PHP | ReflectionParameter isCallable() Function Last Updated : 23 Dec, 2019 Comments Improve Suggest changes Like Article Like Report The ReflectionParameter::isCallable() function is an inbuilt function in PHP which is used to return TRUE if the specified parameter is callable, FALSE otherwise. Syntax: bool ReflectionParameter::isCallable ( void ) Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the specified parameter is callable, FALSE otherwise. Below programs illustrate the ReflectionParameter::isCallable() function in PHP: Program 1: php <?php // Initializing a user-defined class Company1 class Company1 { public function GFG( callable $Parameter){} } // Initializing a subclass Company2 class Company2 extends Company1 { } // Using the ReflectionParameter over the above class $A = new ReflectionParameter(['Company2', 'GFG'], 0); // Calling the isCallable() function $B = $A->isCallable(); // Getting TRUE if the specified parameter // is callable, FALSE otherwise. var_dump($B); ?> Output: bool(true) Program 2: php <?php // Initializing some user-defined classes class Department1 { protected function HR( callable $Parameter1){} } class Department2 { final function Coding( $Parameter2, $Parameter3){} } class Department3 { function Marketing( sting $Parameter4, string $Parameter5, string $Parameter6){} } // Using the ReflectionParameter over the above classes $A = new ReflectionParameter(['Department1', 'HR'], 0); $B = new ReflectionParameter(['Department2', 'Coding'], 1); $C = new ReflectionParameter(['Department3', 'Marketing'], 2); // Calling the isCallable() function and // getting TRUE if the specified parameter // is callable, FALSE otherwise. var_dump($A->isCallable()); var_dump($B->isCallable()); var_dump($C->isCallable()); ?> Output: bool(true) bool(false) bool(false) Reference: https://www.php.net/manual/en/reflectionparameter.iscallable.php Comment More infoAdvertise with us Next Article PHP | ReflectionParameter isCallable() Function K Kanchan_Ray Follow Improve Article Tags : Web Technologies PHP PHP-function PHP- Reflection Similar Reads PHP | ReflectionParameter isArray() Function The ReflectionParameter::isArray() function is an inbuilt function in PHP which is used to return TRUE if the specified parameter is an array, FALSE otherwise. 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