我要寻找的PHP base32函数/类。 不同类别和功能，我发现都是非常无效。 我跑了基准，得出如下结果：
10000个decodings：
base32：2.3273秒
BASE64：0.0062秒
我所使用的base32类是：
http://www.php.net/manual/en/function.base-convert.php#102232
有没有什么办法，其结构简单？
我为什么要使用base32的原因是它不区分大小写，因此我没有任何问题，关于更多的URL参数其中一些系统（例如电子邮件系统）上总是转换为小写字母。
如果你有一个小写的编码一个更好的选择，我也喜欢听到他们的声音。
对于Base32在PHP中，您可以在这里品尝我的实现：
https://github.com/ademarre/binary-to-text-php
从README文件中的Base32例如复制：
// RFC 4648 base32 alphabet; case-insensitive
$base32 = new Base2n(5, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567', FALSE, TRUE, TRUE);
$encoded = $base32->encode('encode this');
// MVXGG33EMUQHI2DJOM======
这不是慢，它可能会或可能不会比你基准类更快，但它不会是一样快，像内置的PHP函数base64_encode() 如果这对你来说很重要，你真的不关心Base32编码，那么你应该只使用十六进制。 您可以用编码本地的PHP函数十六进制，它是不区分大小写。
$encoded = bin2hex('encode this'); // 656e636f64652074686973
$decoded = pack('H*', $encoded); // encode this
// Alternatively, as of PHP 5.4...
$decoded = hex2bin($encoded); // encode this
缺点为十六进制的是，有相比Base32多个数据通货膨胀。 十六进制膨胀数据100％，而Base32膨胀约60％的数据。
试试这个： https://github.com/bbars/utils/blob/master/php-base32-encode-decode/Base32.php
使用区分insesitive alpabet [0-9, av]和工作速度比Base2n(5)
size | Base32::encode | Base32::decode | $base2n->encode | $base2n->decode
-------------------------------------------------------------------------------
1 | 0.0000331401825 | 0.0000088214874 | 0.0002369880676 | 0.0001671314240
2 | 0.0000050067902 | 0.0000040531158 | 0.0000100135803 | 0.0000081062317
4 | 0.0000050067902 | 0.0000059604645 | 0.0000097751617 | 0.0000100135803
8 | 0.0000078678131 | 0.0000100135803 | 0.0000131130219 | 0.0000140666962
16 | 0.0000128746033 | 0.0000178813934 | 0.0000250339508 | 0.0000250339508
32 | 0.0000238418579 | 0.0000319480896 | 0.0000441074371 | 0.0000472068787
64 | 0.0001170635223 | 0.0000629425049 | 0.0000870227814 | 0.0000259876251
128 | 0.0000879764557 | 0.0001208782196 | 0.0001959800720 | 0.0001759529114
256 | 0.0001969337463 | 0.0002408027649 | 0.0004429817200 | 0.0003459453583
512 | 0.0003631114960 | 0.0004880428314 | 0.0021460056305 | 0.0006039142609
1024 | 0.0014970302582 | 0.0009729862213 | 0.0108621120453 | 0.0015850067139
2048 | 0.0013530254364 | 0.0018491744995 | 0.0312080383301 | 0.0027630329132
4096 | 0.0027470588684 | 0.0038080215454 | 0.1312029361725 | 0.0064430236816
8192 | 0.0064270496368 | 0.0086290836334 | 0.5233020782471 | 0.0121779441833
16384 | 0.0112588405609 | 0.0167109966278 | 2.0316259860992 | 0.0277659893036
32768 | 0.0235319137573 | 0.0335960388184 | 11.6220989227295 | 0.0498571395874
65536 | 0.0478749275208 | 0.0648550987244 | |
131072 | 0.1030550003052 | 0.1504058837891 | |
262144 | 0.1995100975037 | 0.2654621601105 | |
524288 | 0.3903131484985 | 0.5326008796692 | |
您可以尝试这些功能我改编自bbars和克罗克福德 ：
function crockford32_encode($data) {
$chars = '0123456789abcdefghjkmnpqrstvwxyz';
$mask = 0b11111;
$dataSize = strlen($data);
$res = '';
$remainder = 0;
$remainderSize = 0;
for($i = 0; $i < $dataSize; $i++) {
$b = ord($data[$i]);
$remainder = ($remainder << 8) | $b;
$remainderSize += 8;
while($remainderSize > 4) {
$remainderSize -= 5;
$c = $remainder & ($mask << $remainderSize);
$c >>= $remainderSize;
$res .= $chars[$c];
}
}
if($remainderSize > 0) {
$remainder <<= (5 - $remainderSize);
$c = $remainder & $mask;
$res .= $chars[$c];
}
return $res;
}
function crockford32_decode($data) {
$map = [
'0' => 0,
'O' => 0,
'o' => 0,
'1' => 1,
'I' => 1,
'i' => 1,
'L' => 1,
'l' => 1,
'2' => 2,
'3' => 3,
'4' => 4,
'5' => 5,
'6' => 6,
'7' => 7,
'8' => 8,
'9' => 9,
'A' => 10,
'a' => 10,
'B' => 11,
'b' => 11,
'C' => 12,
'c' => 12,
'D' => 13,
'd' => 13,
'E' => 14,
'e' => 14,
'F' => 15,
'f' => 15,
'G' => 16,
'g' => 16,
'H' => 17,
'h' => 17,
'J' => 18,
'j' => 18,
'K' => 19,
'k' => 19,
'M' => 20,
'm' => 20,
'N' => 21,
'n' => 21,
'P' => 22,
'p' => 22,
'Q' => 23,
'q' => 23,
'R' => 24,
'r' => 24,
'S' => 25,
's' => 25,
'T' => 26,
't' => 26,
'V' => 27,
'v' => 27,
'W' => 28,
'w' => 28,
'X' => 29,
'x' => 29,
'Y' => 30,
'y' => 30,
'Z' => 31,
'z' => 31,
];
$data = strtolower($data);
$dataSize = strlen($data);
$buf = 0;
$bufSize = 0;
$res = '';
for($i = 0; $i < $dataSize; $i++) {
$c = $data[$i];
if(!isset($map[$c])) {
throw new \Exception("Unsupported character $c (0x".bin2hex($c).") at position $i");
}
$b = $map[$c];
$buf = ($buf << 5) | $b;
$bufSize += 5;
if($bufSize > 7) {
$bufSize -= 8;
$b = ($buf & (0xff << $bufSize)) >> $bufSize;
$res .= chr($b);
}
}
return $res;
}
