3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function gdr_encode($val) { // all characters that json encode without escaping $chrs = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 !#$%&\'()*+,-.:;<=>?@[]^_`{|}~'; $base = strlen($chrs); $str = ''; while ($val > 0) { $str = $chrs[$val % $base] . $str; $val = (int)($val / $base); } return $str; } function gdr_decode($str) { // all characters that json encode without escaping $chrs = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 !#$%&\'()*+,-.:;<=>?@[]^_`{|}~'; $base = strlen($chrs); $map = array(); for ($i=0; $i<$base; $i++) { $map[$chrs[$i]] = $i; } $val = 0; for ($i=0; $i<strlen($str); $i++) { $val *= $base; $val += (int)$map[$str[$i]]; } return $val; } $vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 500000, 999999, 1000000, 4294967295, 4294967296); echo " number string diff\n"; foreach ($vals as $val) { $enc = gdr_encode($val); $dec = gdr_decode($enc); if ($dec !== $val) { echo "ERROR: $val => $enc => $dec\n"; } else { echo sprintf("%10d %7s %2d\n", $dec, "\"$enc\"", strlen($enc)+2-strlen($val)); } }
based on CHYnQ
Output for 4.3.0 - 7.1.0
number string diff 0 "" 1 1 "B" 2 99 "BH" 2 100 "BI" 1 255 "C*" 1 256 "C+" 1 999 "K=" 1 1000 "K>" 0 9999 "BQ!" 1 10000 "BQ#" 0 65535 "H'f" 0 65536 "H'g" 0 99999 "L-`" 0 100000 "L-{" -1 500000 "7G+" -1 999999 "BaNz" 0 1000000 "BaN0" -1 4294967295 "7`7nL" -3 4294967296 "7`7nM" -3