3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $digits = array(0,1,2,3,4,5,6,7,7,8,9,'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'); $base = count($digits); function enc($val) { $str = ''; if (0 === $val) { return '0'; } if (0 > $val) { $str = '-'; $val = -$val; } $digits = $GLOBALS['digits']; $base = $GLOBALS['base']; while (0 < $val) { $str .= $digits[$val % $base]; $val = (int)($val / $base); } return $str; } function gdr_encode($val) { $bin = ''; while ($val > 0) { $bin .= chr($val & 0xFF); $val >>= 8; } return str_replace(array('/', '='), array('_', ''), base64_encode($bin)); } function gdr_decode($str) { $bin = base64_decode(str_replace('_', '/', $str)); $val = 0; for ($i=strlen($bin)-1; $i>=0; $i--) { $val |= ord($bin[$i]) << $i*8; } return $val; } if (!function_exists('json_encode')) { // crappy json_encode function that can handle our narrow input function json_encode($val) { if (is_string($val)) { return "\"$val\""; } if (is_int($val)) { return strval($val); } return "???"; } } $vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 999999, 1000000, 4294967295, 4294967296); foreach ($vals as $val) { $enc = json_encode(gdr_encode($val)); $dec = json_encode(gdr_decode($enc)); $val = json_encode($val); $enc2 = json_encode(enc($val)); if (strlen($enc) > strlen($val)) { echo "$enc $val $enc2 WORSE\n"; } else if (strlen($enc) == strlen($val)) { echo "$enc $val $enc2 EQUAL\n"; } else { echo "$enc $val $enc2\n"; } }
based on kM6kl
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
"" 0 "" WORSE "AQ" 1 "1" WORSE "Yw" 99 "z1" WORSE "ZA" 100 "A1" WORSE "_w" 255 "34" WORSE "AAE" 256 "44" WORSE "5wM" 999 "Re" WORSE "6AM" 1000 "Se" WORSE "Dyc" 9999 "Iv2" WORSE "ECc" 10000 "Jv2" EQUAL "__8" 65535 "evf" EQUAL "AAAB" 65536 "fvf" WORSE "n4YB" 99999 "hbo" WORSE "oIYB" 100000 "ibo" EQUAL "P0IP" 999999 "0XZ3" EQUAL "QEIP" 1000000 "1XZ3" "_____w" 4294967295 "3jDDj4" "AAAAAAE" 4294967296 "4jDDj4"