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   // 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   // 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
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