The ReflectionParameter::allowsNull() function is an inbuilt function in PHP which is used to checks whether the parameter NULL is allowed or not.
Syntax:
bool ReflectionParameter::allowsNull ( void )
Parameters: This function does not accept any parameters.
Return Value: This function returns TRUE if NULL parameter is allowed else FALSE.
Below programs illustrate the ReflectionParameter::allowsNull() function in PHP:
Program 1:
<?php // Initializing a user-defined class Company1 class Company1
{ public function GFG( Exception $Parameter ){}
} // Initializing a subclass Company2 class Company2 extends Company1
{ } // Using the ReflectionParameter over the above class $A = new ReflectionParameter([ 'Company2' , 'GFG' ], 0);
// Calling the allowsNull() function $B = $A ->allowsNull();
// Getting the boolean value TRUE if NULL // parameter is allowed else FALSE. var_dump( $B );
?> |
Output:
bool(false)
Program 2:
<?php // Initializing some user-defined classes class Department1
{ public function HR( $Parameter1 ){}
} class Department2
{ public function Coding( Exception $Parameter2 , Exception $Parameter3 ){}
} class Department3
{ public function Marketing( $Parameter4 , $Parameter5 , $Parameter6 ){}
} // Using the ReflectionParameter over the above classes $A = new ReflectionParameter([ 'Department1' , 'HR' ], 0);
$B = new ReflectionParameter([ 'Department2' , 'Coding' ], 1);
$C = new ReflectionParameter([ 'Department3' , 'Marketing' ], 2);
// Calling the allowsNull() function and // getting the boolean value TRUE if NULL // parameter is allowed else FALSE. var_dump( $A ->allowsNull());
var_dump( $B ->allowsNull());
var_dump( $C ->allowsNull());
?> |
Output:
bool(true) bool(false) bool(true)
Reference: https://www.php.net/manual/en/reflectionparameter.allowsnull.php