3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php 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); if (strlen($enc) > strlen($val)) { echo "$enc $val WORSE\n"; } else if (strlen($enc) == strlen($val)) { echo "$enc $val EQUAL\n"; } else { echo "$enc $val\n"; } }
based on lqNZY
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 WORSE "Yw" 99 WORSE "ZA" 100 WORSE "_w" 255 WORSE "AAE" 256 WORSE "5wM" 999 WORSE "6AM" 1000 WORSE "Dyc" 9999 WORSE "ECc" 10000 EQUAL "__8" 65535 EQUAL "AAAB" 65536 WORSE "n4YB" 99999 WORSE "oIYB" 100000 EQUAL "P0IP" 999999 EQUAL "QEIP" 1000000 "_____w" 4294967295 "AAAAAAE" 4294967296