对URL进行加密,解密源代码，也可以当做其他加密或解密使用

示例代码

<?php
$Cache = new ESApi();
$json = $Cache->encoded_url($_REQUEST['txt'],$_REQUEST['key']);
echo json_encode($json,JSON_PRETTY_PRINT|JSON_UNESCAPED_UNICODE);

class ESApi{
    //编码
    public function encoded_url($txt, $key = ''){
        $txt = $txt . $key;
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
        $nh = rand(0, 64);
        $ch = $chars[$nh];
        $mdKey = md5($key . $ch);
        $mdKey = substr($mdKey, $nh % 8, $nh % 8 + 7);
        $txt = base64_encode($txt);
        $tmp = '';
        $i = 0;
        $j = 0;
        $k = 0;
        for ($i = 0; $i < strlen($txt); $i++) {
            $k = $k == strlen($mdKey) ? 0 : $k;
            $j = ($nh + strpos($chars, $txt[$i]) + ord($mdKey[$k++])) % 64;
            $tmp .= $chars[$j];
        }
        return urlencode(base64_encode($ch . $tmp));
    }
    //解码
    public function decode_url($txt, $key = ''){
        $txt = base64_decode(urldecode($txt));
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-=+";
        $ch = $txt[0];
 if(!empty($txt)){
 $nh = strpos($chars, $ch);
 }else{
 $nh = $ch;
 }
        $mdKey = md5($key . $ch);
        $mdKey = substr($mdKey, $nh % 8, $nh % 8 + 7);
        $txt = substr($txt, 1);
        $tmp = '';
        $i = 0;
        $j = 0;
        $k = 0;
        for ($i = 0; $i < strlen($txt); $i++) {
            $k = $k == strlen($mdKey) ? 0 : $k;
            $j = strpos($chars, $txt[$i]) - $nh - ord($mdKey[$k++]);
            while ($j < 0) {
                $j += 64;
            }
            $tmp .= $chars[$j];
        }
        return trim(base64_decode($tmp), $key);
    }
}