PHP | ReflectionClass hasConstant() Function
Last Updated :
04 Dec, 2019
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The ReflectionClass::hasConstant() function is an inbuilt function in PHP which is used to check the specified constant is present or not.
Syntax:
php
php
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 = 'GeeksforGeeks';
}
// 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);
?>
<?php// Defining a user-defined class Companyclass Company { const c1 = 'GeeksforGeeks';}// Using the ReflectionClass over the// defined user-defined class Company$constant = new ReflectionClass("Company");// Calling the hasConstant() function$const = $constant->hasConstant("c1");// Getting the value TRUE or FALSEvar_dump($const);?>
Output:
Program 2:
bool(true)
<?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"));
?>
<?php // Defining an empty classclass Company {} // Using the ReflectionClass over the// defined user-defined class Company$constant = new ReflectionClass("Company"); // Calling the hasConstant() function and// getting the value TRUE or FALSEvar_dump($constant->hasConstant("c1"));?>
Output:
Reference: https://secure.php.net/manual/en/reflectionclass.hasconstant.php
bool(false)
