Question

I would like or I will prefer indicate the real type of a parameter in a function with Php, it’s possible ?

Example :

<?php
function test($param)
{
   echo $param;
}
$str = "hiiiii everyone";
test($str);
?>

Instead of put just $param in the function test; I would like put something like that

function test(string $param) // string is the type of the param, that can be int, long ect or an object which I had created.

It’s possible to do that with the last version of PHP ?

Answer 1

What you are looking for is Type Hinting. However, as stated in the linked manual page:

Type hints can not be used with scalar types such as int or string.

This means that no, you cannot force the argument for a function to be string. You can force it to be an instance of a specific class, something which is callable, or an array.

If you want to force an argument to be a string, do something like this:

function my_func ($mustBeAString) {
  if (!is_string($mustBeAString)) return;
  // Do stuff here
}