Slower Than Pure PHP

[mailmug]

Hi
I tried with the following code. Then I tried using the xdebug. I think it is slower than pure PHP functions.
Please help me.

namespace Utils;

class Greeting
{

    public static function say()
    {
        int item;
        for item in range(0, 100000) {
            string i = "abc";
            string k = str_replace("b", "--", i);
            string z = "abc";
            string m = str_replace("b", "--", z);
            string t = "rrrr";
            string g = str_replace("b", "--", t);
            string q = "rrrr";
            string u = str_replace("b", "--", q);
        }

        echo "okk";
    }

}

PHP CODE

 <?php 

noo();

Utils\Greeting::say();


function noo(){
    for ($ii=0; $ii++; $ii<= 100000) {
        $i = "abc";
        $k = str_replace("b", "--", $i);
        $z = "abc";
        $m = str_replace("b", "--", $z);
        $t = "rrrr";
        $g = str_replace("b", "--", $t);
        $q = "rrrr";
        $u = str_replace("b", "--", $q);
    }
    echo "okk";
}