<?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');
$base = count($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";
}
}
- 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- "" 0 "" WORSE
"AQ" 1 "1" WORSE
"Yw" 99 "o2" WORSE
"ZA" 100 "p2" WORSE
"_w" 255 "w6" WORSE
"AAE" 256 "x6" WORSE
"5wM" 999 "0q" WORSE
"6AM" 1000 "1q" WORSE
"Dyc" 9999 "8a7" WORSE
"ECc" 10000 "9a7" EQUAL
"__8" 65535 "7v91" EQUAL
"AAAB" 65536 "8v91" WORSE
"n4YB" 99999 "o1z1" WORSE
"oIYB" 100000 "p1z1" EQUAL
"P0IP" 999999 "0gqi" EQUAL
"QEIP" 1000000 "1gqi"
"_____w" 4294967295 "6mynxn1"
"AAAAAAE" 4294967296 "7mynxn1"
preferences:
287.83 ms | 406 KiB | 459 Q