Base32或Base64的自定义实现 [英] Custom implementation of Base32 or Base64
本文介绍了Base32或Base64的自定义实现的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要在PHP Base32或Base64的自定义实现(库或一组类/函数)
I need custom implementation (library or set of classes/functions) of Base32 or Base64 in PHP
函数返回的URL字符串安全
Function should return URL safe strings.
推荐答案
由于您没有访问的base64打造的功能,我建议你:
Since you don't have access to base64 build in function I suggest you this :
<?php
echo bencode("Gabriel Malca");
// R2FicmllbCBNYWxjYQ==
function bencode($string='') {
$binval = convert_binary_str($string);
$final = "";
$start = 0;
while ($start < strlen($binval)) {
if (strlen(substr($binval,$start)) < 6)
$binval .= str_repeat("0",6-strlen(substr($binval,$start)));
$tmp = bindec(substr($binval,$start,6));
if ($tmp < 26)
$final .= chr($tmp+65);
elseif ($tmp > 25 && $tmp < 52)
$final .= chr($tmp+71);
elseif ($tmp == 62)
$final .= "+";
elseif ($tmp == 63)
$final .= "/";
elseif (!$tmp)
$final .= "A";
else
$final .= chr($tmp-4);
$start += 6;
}
if (strlen($final)%4>0)
$final .= str_repeat("=",4-strlen($final)%4);
return $final;
}
function convert_binary_str($string) {
if (strlen($string)<=0) return;
$tmp = decbin(ord($string[0]));
$tmp = str_repeat("0",8-strlen($tmp)).$tmp;
return $tmp.convert_binary_str(substr($string,1));
}
?>
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