页面重定向、页面回退、禁止表单外部提交、获取设备类型

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页面重定向：

function jumpurl($url,$msg='')
{
    if(empty($msg)) {
        header("Location: " . $url);
    }else{

        echo  "<script> ";
        echo "alert('$msg');";
        echo  "window.location.href = '$url';";
        echo " </script>";
        exit;
    }
}

页面回退：

function gourl($iAlert,$iPage,$history='',$target="window")
{
    if ($iAlert != "") {
        echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
        echo '<script language="javascript">alert("'.$iAlert.'")</script>';
    }
    if ($iPage != "") {
        echo '<script language="javascript">'.$target.'.location.href = "'.$iPage.'";</script>';
        exit;
    }
    if ($history != "") {
        echo '<script language="javascript">history.go('.$history.');</script>';
        exit;
    }
}

禁止表单外部提交：

function chkfrompath()
{
    /*
    禁止表单外部提交
    */
    $domain = $_SERVER['SERVER_NAME'];
    $frompath = strtolower(@$_SERVER['HTTP_REFERER']);
    preg_match("/\/\/(.*)\/指定域名信息等\//",$frompath,$arr);
    $frompathdomain = $arr[1];
 	if($frompathdomain!=$domain)
 	{
 		gourl('禁止表单外部提交。','logout.php','','top');
 	}
}

获取设备类型：

function returndev(){
    $agent = strtolower($_SERVER['HTTP_USER_AGENT']);
    $dev = '';
    $dev=($dev == '' && strpos($agent, 'iphone')) ? 'iphone' : '';
    $dev=($dev == '' && strpos($agent, 'ipad')) ? 'ipad' : '';
    $dev=($dev == '' && strpos($agent, 'android')) ? 'android' : '';
    $dev=($dev == '')?'pc' : $dev;
    return $dev;
}