<?php
$string = "This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long strinThis is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = g = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long strinThis is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = g = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string = This is a very, very very, very, very long string";
echo strlen($string);
Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).