<?php
function gdr_encode($val) {
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!=';
$base = strlen($chars);
$str = '';
while ($val > 0) {
$str = $chars[$val % $base] . $str;
$val = (int)($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;
}
$vals = array(0, 1, 99, 100, 255, 256, 999, 1000, 9999, 10000, 65535, 65536, 99999, 100000, 999999, 1000000, 4294967295, 4294967296);
foreach ($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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- "" 0 WORSE
"B" 1 WORSE
"Bj" 99 WORSE
"Bk" 100 WORSE
"D=" 255 WORSE
"EA" 256 WORSE
"Pn" 999 WORSE
"Po" 1000 EQUAL
"CcP" 9999 WORSE
"CcQ" 10000 EQUAL
"P==" 65535 EQUAL
"QAA" 65536 EQUAL
"Yaf" 99999 EQUAL
"Yag" 100000
"D0I=" 999999 EQUAL
"D0JA" 1000000
"D=====" 4294967295
"EAAAAA" 4294967296
preferences:
326.26 ms | 406 KiB | 459 Q