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    // Initializing a user-defined class Company1 class Company1 {     function GFG($Full_Name = neveropen){} }     // 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     // 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
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