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加密：

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function string_secret($string)
{
    $key = "yadgen";
 
    //密锁串，不能出现重复字符，内有A-Z,a-z,0-9,/,=,+,_,
    $lockstream = 'st=lDEFABCNOPyzghi_jQRST-UwxkVWXYZabcdef+IJK6/7nopqr89LMmGH012345uv';
    //随机找一个数字，并从密锁串中找到一个密锁值
    $lockLen = strlen($lockstream);
    $lockCount = rand(0,$lockLen-1);
    $randomLock = $lockstream[$lockCount];
    //结合随机密锁值生成MD5后的密码
    $password = md5($key.$randomLock);
    //开始对字符串加密
    $txtStream = base64_encode($string);
    $tmpStream = '';
    $i=0;$j=0;$k = 0;
    for ($i=0; $i<strlen($txtStream); $i++) {
        $k = ($k == strlen($password)) ? 0 : $k;
        $j = (strpos($lockstream,$txtStream[$i])+$lockCount+ord($password[$k]))%($lockLen);
        $tmpStream .= $lockstream[$j];
        $k++;
    }
    return $tmpStream.$randomLock;
}

解密：

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function secret_string($string)
{
    $key = "yadgen";
 
    //密锁串，不能出现重复字符，内有A-Z,a-z,0-9,/,=,+,_,
    $lockstream = 'st=lDEFABCNOPyzghi_jQRST-UwxkVWXYZabcdef+IJK6/7nopqr89LMmGH012345uv';
 
    $lockLen = strlen($lockstream);
    //获得字符串长度
    $txtLen = strlen($string);
    //截取随机密锁值
    $randomLock = $string[$txtLen - 1];
    //获得随机密码值的位置
    $lockCount = strpos($lockstream,$randomLock);
    //结合随机密锁值生成MD5后的密码
    $password = md5($key.$randomLock);
    //开始对字符串解密
    $txtStream = substr($string,0,$txtLen-1);
    $tmpStream = '';
    $i=0;$j=0;$k = 0;
    for($i=0; $i<strlen($txtStream); $i++){
        $k = ($k == strlen($password)) ? 0 : $k;
        $j = strpos($lockstream,$txtStream[$i]) - $lockCount - ord($password[$k]);
        while($j < 0){
            $j = $j + ($lockLen);
        }
        $tmpStream .= $lockstream[$j];
        $k++;
    }
    return base64_decode($tmpStream);
}

by ·0评论

Javascript 代码如下：

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function is_weixn(){
    var ua = navigator.userAgent.toLowerCase();
    if(ua.match(/MicroMessenger/i)=="micromessenger") {
        return true;
    } else {
        return false;
    }
}

PHP 代码如下：

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function is_weixin(){
    if ( strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false ) {
            return true;
    }  
    return false;
}

by ·0评论

代码如下：

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var u = navigator.userAgent, app = navigator.appVersion;
var is_Android = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //android终端或者uc浏览器
var is_iOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
alert(is_Android);
alert(is_iOS);