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; } $vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 500000, 999999, 1000000, 4294967295, 4294967296); foreach ($vals as $val) { $enc = gdr_encode($val); $dec = gdr_decode($enc); if ($dec !== $val) { echo "ERROR: $val => $enc => $dec\n"; } else if (strlen($enc)+2 > strlen($val)) { echo "+ \"$enc\" $val\n"; } else if (strlen($enc)+2 == strlen($val)) { echo "= \"$enc\" $val\n"; } else { echo "- \"$enc\" $val\n"; } }
based on DW3B6
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
+ "" 0 + "B" 1 + "BH" 99 + "BI" 100 + "C*" 255 + "C+" 256 + "K=" 999 = "K>" 1000 + "BQ!" 9999 = "BQ#" 10000 = "H'f" 65535 = "H'g" 65536 = "L-`" 99999 - "L-{" 100000 - "7G+" 500000 = "BaNz" 999999 - "BaN0" 1000000 - "7`7nL" 4294967295 - "7`7nM" 4294967296