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 = '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 );
?> |
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