自用加密方法

if(!function_exists('base64_encrypt')){
    function base64_encrypt($str){
        $key = 'abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $result = strtr(base64_encode($str), '+', '_');
        $result = strtr($result, '/', '\\');
        $max = strlen($result) - 2;
        if($max > strlen($key)){
            $max = strlen($key) - 1;
        }
        $index = rand(0, $max);
        $char = $key[$index];
        $result =  $char.substr(substr_replace($result, $char, $index, 0), 0);
        return $result;
    }
}

if(!function_exists('base64_decrypt')){
    function base64_decrypt($str){
        $key = 'abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $char = substr($str, 0, 1);
        $str = substr($str, 1);
        $index = strpos($key, $char);
        $str = substr($str, 0, $index).substr($str, $index + 1);
        $str = strtr($str, '_', '+');
        $str = strtr($str, '\\', '/');
        return base64_decode($str);
    }
}

 

 

注意事項：$key字符串不能出現重複字符 不然會致使解密失敗！