PHP | ReflectionParameter isOptional() Function Last Updated : 23 Dec, 2019 Comments Improve Suggest changes Like Article Like Report The ReflectionParameter::isOptional() function is an inbuilt function in PHP which is used to return TRUE if the specified parameter is optional, otherwise FALSE. Syntax: bool ReflectionParameter::isOptional ( void ) Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the specified parameter is optional, otherwise FALSE. Below programs illustrate the ReflectionParameter::isOptional() function in PHP: Program 1: php <?php // Initializing a user-defined class Company1 class Company1 { function GFG($Full_Name = GeeksforGeeks){} } // Initializing a subclass Company2 class Company2 extends Company1 { } // Using the ReflectionParameter over the above class $A = new ReflectionParameter(['Company2', 'GFG'], 0); // Calling the isOptional() function $B = $A->isOptional(); // Getting TRUE if the specified parameter // is optional, otherwise FALSE. var_dump($B); ?> Output: bool(true) Program 2: php <?php // Initializing some user-defined classes class Department1 { function HR( $Full_Name){} } class Department2 { function Coding( $Parameter2, $Par3 = 'Parameter3'){} } class Department3 { function Marketing( $Parameter4, $Parameter5){} } // Using the ReflectionParameter over the above classes $A = new ReflectionParameter(['Department1', 'HR'], 0); $B = new ReflectionParameter(['Department2', 'Coding'], 1); $C = new ReflectionParameter(['Department3', 'Marketing'], 1); // Calling the isOptional() function and // getting TRUE if the specified parameter // is optional, otherwise FALSE. var_dump($A->isOptional()); var_dump($B->isOptional()); var_dump($C->isOptional()); ?> Output: bool(false) bool(true) bool(false) Reference: https://www.php.net/manual/en/reflectionparameter.isoptional.php Comment More infoAdvertise with us Next Article PHP | ReflectionParameter isOptional() Function K Kanchan_Ray Follow Improve Article Tags : Web Technologies PHP PHP-function PHP- Reflection Similar Reads PHP | ReflectionParameter getName() Function The ReflectionParameter::getName() function is an inbuilt function in PHP which is used to return the name of the specified parameter. 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