怎么使用token

<br /><?php<br />define('KEY', '#^DKHSD&*F'); // 定义密钥<br /><br />$id = '123';<br />$token = genToken($id);<br /><br />echo 'id encrypt token='.$token.'<br>';<br />echo 'token decrypt id='.checkToken($token);<br /><br />// 创建token<br />function genToken($id){<br />    $str = json_encode(array(time(),mt_rand(1000,9999),$id));<br />    return authcode($str, 'ENCODE', KEY);<br />}<br /><br />// 验证token<br />function checkToken($token){<br />    $str = authcode($token, 'DECODE', KEY);<br />    $result = json_decode($str);<br />    if(is_array($result)){<br />        return $result[2];<br />    }else{<br />        return 'decrypt fail';<br />    }<br />}<br /><br /><br />// 加密/解密方法<br />function authcode($string, $operation = 'DECODE', $key){<br /><br />    $ckey_length = 4;   // 随机密钥长度 取值 0-32;<br /><br />    $key = md5($key);<br />    $keya = md5(substr($key, 0, 16));<br />    $keyb = md5(substr($key, 16, 16));<br />    $keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';<br /><br />    $cryptkey = $keya.md5($keya.$keyc);<br />    $key_length = strlen($cryptkey);<br /><br />    $string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', 0).substr(md5($string.$keyb), 0, 16).$string;<br />    $string_length = strlen($string);<br /><br />    $result = '';<br />    $box = range(0, 255);<br /><br />    $rndkey = array();<br />    for($i = 0; $i <= 255; $i++) {<br />        $rndkey[$i] = ord($cryptkey[$i % $key_length]);<br />    }<br /><br />    for($j = $i = 0; $i < 256; $i++) {<br />        $j = ($j + $box[$i] + $rndkey[$i]) % 256;<br />        $tmp = $box[$i];<br />        $box[$i] = $box[$j];<br />        $box[$j] = $tmp;<br />    }<br /><br />    for($a = $j = $i = 0; $i < $string_length; $i++) {<br />        $a = ($a + 1) % 256;<br />        $j = ($j + $box[$a]) % 256;<br />        $tmp = $box[$a];<br />        $box[$a] = $box[$j];<br />        $box[$j] = $tmp;<br />        $result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));<br />    }<br /><br />    if($operation == 'DECODE') {<br />        if((substr($result, 0, 10) == 0 <br><font color='#FF8000'>------解决方案--------------------</font><br> substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {<br />            return substr($result, 26);<br />        } else {<br />            return '';<br />        }<br />    } else {<br />        return $keyc.str_replace('=', '', base64_encode($result));<br />    }<br /><br />}<br />?><br />