<?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