PHPScalarTypeHinting

Adds scalar type hinting to php, using the error handler. No hassle, just works.

Installation

Just add include('PHPScalarTypeHinting.php'); to your default includes and you are set. Alternatively, if you are already using a custom error handler, just copy the function defined in PHPScalarTypeHinting.php to the start of your error handler.

Usage

Just use type hinting like you would expect type hinting to work:

Strings:

function hello(string $person){
  echo "Hello $person";
}
hello("Kay"); //'Hello Kay'

hello(2);//Error
hello(array());//Error

Integers

function incAndPrint(int $val){//Or integer
  var_dump($val + 1);
}

incAndPrint(1);//'int(2)'

Special parent classes are also possible:

function setValue(object $object, string $value){
  $object->$value = 'hello';
}

$foo = new stdClass();
setValue($foo, 'bar');
echo $foo->bar;//'hello'

function incAndPrint(numeric $val){
  var_dump($val + 1);
}

incAndPrint(1.1);//'double(2.1)'

Overview of the added types for type hinting

Keyword	Allowed Types
int	integer
integer	integer
float	float
double	float
real	float
bool	boolean
boolean	boolean
string	string
numeric	integer or float
scalar	integer, float, boolean or string
object	object