string length test

<?php

define('TESTLEN', 5);
define('TESTCOUNT', 1001); // Run 1000 times
$s1 = "test"; // length 4, last index 3
$s2 = "testX"; // length 5, last index 4

include 'string.php';

class String1 {
    protected $val;
    public function __construct($val) {
        $this->val = $val;
    }
    public function getLength() {
        return strlen($this->val);
    }
}


for ($x=0; $x < 6; $x++) {
    echo "\n\n====> Test run $x\n";
    $start = microtime(TRUE);
    for ($i=0; $i < TESTCOUNT; $i++) {
        $s = isset($s1{TESTLEN - 1}); // FALSE, NOTE: 0-based index
        $s = isset($s2{TESTLEN - 1}); // TRUE
    }
    $end = microtime(TRUE);
    echo "Test with {} = ".($end - $start)."\n";

    $start = microtime(TRUE);
    for ($i=0; $i < TESTCOUNT; $i++) {
        $s = strlen($s1) < TESTLEN; // FALSE
        $s = strlen($s2) < TESTLEN; // TRUE
    }
    $end = microtime(TRUE);
    echo "Test with strlen() = ".($end - $start)."\n";

    $start = microtime(TRUE);
    for ($i=0; $i < TESTCOUNT; $i++) {
        $s = mb_strlen($s1) < TESTLEN; // FALSE
        $s = mb_strlen($s2) < TESTLEN; // TRUE
    }
    $end = microtime(TRUE);
    echo "Test with mb_strlen() = ".($end - $start)."\n";


    $start = microtime(TRUE);
    for ($i=0; $i < TESTCOUNT; $i++) {
        $t = new String1($s1);
        $s = $t->getLength() < TESTLEN; // FALSE
        $t = new String1($s2);
        $s = $t->getLength() < TESTLEN; // TRUE
    }
    $end = microtime(TRUE);
    echo "Test with String1 object = ".($end - $start)."\n";

    $start = microtime(TRUE);
    for ($i=0; $i < TESTCOUNT; $i++) {
        $t = new String($s1);
        $s = $t->getLength() < TESTLEN; // FALSE
        $t = new String($s2);
        $s = $t->getLength() < TESTLEN; // TRUE
    }
    $end = microtime(TRUE);
    echo "Test with String object = ".($end - $start)."\n";

}

?>