3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function gdr_encode($val) { $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!='; $base = strlen($chars); $str = ''; while ($val > 0) { $str .= $chars[$val % $base]; $val = (int)($val / $base); } return $str; } function gdr_decode($str) { $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!='; $base = strlen($chars); $map = array(); for ($i=0; $i<$base; $i++) { $map[$chars[$i]] = $i; } $val = 0; for ($i=0; $i<strlen($str); $i++) { $val *= $base; $val += (int)$map[$str[$i]]; } return $val; } $vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 999999, 1000000, 1023410115, 4294967295, 4294967296); foreach ($vals as $val) { $enc = gdr_encode($val); $dec = gdr_decode($enc); if (strlen($enc)+2 > strlen($val)) { echo "\"$enc\" $val WORSE\n"; } else if (strlen($enc)+2 == strlen($val)) { echo "\"$enc\" $val EQUAL\n"; } else { echo "\"$enc\" $val\n"; } }
based on o62sW
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
"" 0 WORSE "B" 1 WORSE "jB" 99 WORSE "kB" 100 WORSE "=D" 255 WORSE "AE" 256 WORSE "nP" 999 WORSE "oP" 1000 EQUAL "PcC" 9999 WORSE "QcC" 10000 EQUAL "==P" 65535 EQUAL "AAQ" 65536 EQUAL "faY" 99999 EQUAL "gaY" 100000 "=I0D" 999999 EQUAL "AJ0D" 1000000 "D===8" 1023410115 "=====D" 4294967295 "AAAAAE" 4294967296