3v4l.org

run code in 300+ PHP versions simultaneously
<?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; } $vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 999999, 1000000, 4294967295, 4294967296); //$vals = array(1); 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"; } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
"" 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" 4294967295 "AAAAAE" 4294967296

preferences:
283.2 ms | 406 KiB | 454 Q