<?php

$urls = array(

    'http://www.baidu.com',

    'http://www.qq.com',

    'http://www.sina.com',

    'http://www.163.com',

    'http://www.sohu.com'

);

$ch = curl_init();

$timeout = 5;

$max = 0;

$max_url = '';

foreach ($urls as $url) {

    curl_setopt($ch, CURLOPT_URL, $url);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);

    $start = microtime(true);

    curl_exec($ch);

    $end = microtime(true);

    $time = $end - $start;

    if ($time > $max) {

        $max = $time;

        $max_url = $url;

    }

}

curl_close($ch);

header("Location: $max_url");

?>