Simulate PHP (hacked) type hint performance.

type-hint.php

<?php
set_error_handler(function($ecode, $emesg, $efile, $eline) {
    if (!$ecode || (error_reporting() & $ecode) == 0) {
        return;
    }

    if ($ecode == E_RECOVERABLE_ERROR) {
        $pattern = '~^Argument (\d)+ passed to (.+) must be '.
            '(?<type>of the type|an instance of) (?<hint>.+), (?<given>.+) given~i';
        if (preg_match($pattern, $emesg, $match)) {
            $error = true;
            $hint  =@ end(explode('\\', strtolower($match['hint'])));
            switch ($hint) {
                case 'int':
                case 'integer':
                    $error = strpos($match['given'], 'int') !== 0;
                    break;
                case 'string':
                    $error = $match['given'] != 'string';
                    break;
                case 'real':
                case 'float':
                case 'double':
                    $error = $match['given'] != 'double';
                    break;
                case 'num':
                case 'number':
                case 'numeric':
                    $error = strpos($match['given'], 'int') !== 0 && $match['given'] != 'double';
                    break;
                case 'bool':
                case 'boolean':
                    $error = $match['given'] != 'boolean';
                    break;
                case 'object':
                    $error = strpos($match['given'], 'instance of') !== 0;
                    break;
                case 'resource':
                    $error = $match['given'] != 'resource';
                    break;
                case 'any':
                case 'mixed':
                    $error = false;
                    break;
            }

            if ($error) {
                throw new \ErrorException(sprintf(
                    'Argument %d passed to %s must be of the type %s, %s given!',
                        $match[1], $match[2], $hint, $match['given']
                ), $ecode);
            }
        }
    }

    // don't execute php internal error handler
    return true;
});

class User {}

function get_memo() {
    $size = memory_get_usage();
    $unit = ['b', 'kb', 'mb', 'gb', 'tb', 'pb'];
    return @round($size / pow(1024, ($i = floor(log($size, 1024)))), 2) .' '. $unit[$i];
}

function foo_int(int $a) {}
function foo_array(array $a) {}
function foo_class(User $a) {}

printf("%s\n", get_memo());
for ($i = 0, $t = microtime(1); $i < 100000; $i++) {
    foo_int(1);
}
printf("%s\n", microtime(1) - $t);
printf("%s\n", get_memo());

printf("----------------------\n");

printf("%s\n", get_memo());
for ($i = 0, $t = microtime(1); $i < 100000; $i++) {
    foo_array([]);
}
printf("%s\n", microtime(1) - $t);
printf("%s\n", get_memo());

printf("----------------------\n");

printf("%s\n", get_memo());
for ($i = 0, $t = microtime(1); $i < 100000; $i++) {
    foo_class(new User);
}
printf("%s\n", microtime(1) - $t);
printf("%s\n", get_memo());
?>

Results:

217.35 kb
1.3914940357208
218.23 kb
----------------------
218.23 kb
0.015022039413452
218.23 kb
----------------------
218.23 kb
0.029924869537354
218.23 kb

###
So, does it trigger autoloader?

Absolutely NO, in my tests..

<?php
spl_autoload_register(function($c) {
    print($c); # just print class name that tried to load
});

function a(foo $f) {}

a(123);     # this won't but throw exception
a(new foo); # this will of course

?>