PHP | ReflectionParameter getDefaultValueConstantName() Function Last Updated : 23 Dec, 2019 Comments Improve Suggest changes Like Article Like Report The ReflectionParameter::getDefaultValueConstantName() function is an inbuilt function in PHP which is used to return the default value's constant name if default value is constant or null. Syntax: string ReflectionParameter::getDefaultValueConstantName ( void ) Parameters: This function does not accept any parameters. Return Value: This function returns the default value's constant name if default value is constant or null. Below programs illustrate the ReflectionParameter::getDefaultValueConstantName() 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 getDefaultValueConstantName() function $B = $A->getDefaultValueConstantName(); // Getting the default value's constant name // if default value is constant or null var_dump($B); ?> Output: string(13) "GeeksforGeeks" Program 2: php <?php // Initializing some user-defined classes class Department1 { function HR( $Full_Name = Human_Resource){} } class Department2 { function Coding( $Parameter2, $Par3 = Parameter3){} } class Department3 { function Marketing( $Parameter4 = Digital_Marketing, $Parameter5){} } // Using the ReflectionParameter over the above classes $A = new ReflectionParameter(['Department1', 'HR'], 0); $B = new ReflectionParameter(['Department2', 'Coding'], 1); $C = new ReflectionParameter(['Department3', 'Marketing'], 0); // Calling the getDefaultValueConstantName() function and // getting the default value's constant name if // default value is constant or null var_dump($A->getDefaultValueConstantName()); var_dump($B->getDefaultValueConstantName()); var_dump($C->getDefaultValueConstantName()); ?> Output: string(14) "Human_Resource" string(10) "Parameter3" string(17) "Digital_Marketing" Reference: https://www.php.net/manual/en/reflectionparameter.getdefaultvalueconstantname.php Comment More infoAdvertise with us Next Article PHP | ReflectionParameter getDefaultValueConstantName() Function K Kanchan_Ray Follow Improve Article Tags : Web Technologies PHP PHP-function PHP- Reflection Similar Reads PHP | ReflectionParameter isDefaultValueConstant() Function The ReflectionParameter::isDefaultValueConstant() function is an inbuilt function in PHP which is used to return TRUE if the default value is constant, and FALSE otherwise. 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