Online PHP editor | refs for Yrk9L

<?php function gdr_encode($val) { $str = ''; while ($val > 0) { $str .= chr($val & 0xFF); $val = $val >> 8; } return str_replace(array('/', '='), array('_', ''), base64_encode($str)); } function gdr_decode($bin) { $str = base64_decode(str_replace('_', '/', $bin)); $val = 0; for ($i=0; $i<strlen($str); $i++) { $val |= ord($str[$i]) << $i*8; } return $val; } mt_srand(42); // seed rng for semi-consistent values for ($i=0; $i<32; $i++) { $val = 1<<$i; $val += mt_rand(0, $val/2); $enc = gdr_encode($val); $dec = gdr_decode($enc); if ($val === $dec) { echo "$enc $val\n"; } else { echo "$enc $val ERROR: gdr_decode($enc) == $dec\n"; } }