The ReflectionClass::hasConstant() function is an inbuilt function in PHP which is used to check the specified constant is present or not.
Syntax:
bool ReflectionClass::hasConstant( string $name )
Parameters: This function accepts a single parameter $name which holds the name of the defined constant.
Return Value: This function returns TRUE if the constant is define, FALSE otherwise.
Below programs illustrate the ReflectionClass::hasConstant() function in PHP:
Program 1:
<?php   // Defining a user-defined class Company class Company {     const c1 = 'neveropen'; }   // Using the ReflectionClass over the // defined user-defined class Company $constant = new ReflectionClass("Company");   // Calling the hasConstant() function $const = $constant->hasConstant("c1");   // Getting the value TRUE or FALSE var_dump($const); ?> |
Output:
bool(true)
Program 2:
<?php    // Defining an empty class class Company { }    // Using the ReflectionClass over the // defined user-defined class Company $constant = new ReflectionClass("Company");    // Calling the hasConstant() function and // getting the value TRUE or FALSE var_dump($constant->hasConstant("c1")); ?> |
Output:
bool(false)
Reference: https://secure.php.net/manual/en/reflectionclass.hasconstant.php
