<?php
function a($string) {
$ln = strlen($string);
for ($i = 0; $i < $ln; $i++)
$tmp = $string{$i};
echo memory_get_peak_usage()."\n";
echo memory_get_usage()."\n";
}
echo memory_get_peak_usage()."\n";
$str = $str2 = $str3 = str_repeat(' ', 1024 * 1024);
a($str);