php curl 批量请求

实例：

<?php

$ch = array();
$res = array();
$conn = array();

$urls = array(
    'baidu' => "http://www.baidu.com/",
    'cheyun' => "http://auto.jrj.com.cn/",
    'w3c' => "http://www.w3cschool.cc/",
);

// 创建批处理cURL句柄
$mh = curl_multi_init();

foreach ($urls as $i => $url) {
    // 创建一对cURL资源
    $conn[$i] = curl_init();
    // 设置URL和相应的选项
    curl_setopt($conn[$i], CURLOPT_URL, $url);
    curl_setopt($conn[$i], CURLOPT_HEADER, 0);
    curl_setopt($conn[$i], CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($conn[$i], CURLOPT_TIMEOUT, 10);
    //302跳转
    curl_setopt($conn[$i], CURLOPT_FOLLOWLOCATION, 1);

    // 增加句柄
    curl_multi_add_handle($mh, $conn[$i]);
}


$active = null;
//防卡死写法：执行批处理句柄
do {
    $mrc = curl_multi_exec($mh, $active);

} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($mh) != -1) {
        do {
            $mrc = curl_multi_exec($mh, $active);

        } while ($mrc == CURLM_CALL_MULTI_PERFORM);
    }
}

foreach ($urls as $i => $url) {
    //获取当前解析的cURL的相关传输信息
    $info = curl_multi_info_read($mh);

    //获取请求头信息
    $heards = curl_getinfo($conn[$i]);

    var_dump($heards);

    //获取输出的文本流
    $res[$i] = curl_multi_getcontent($conn[$i]);

    // 移除curl批处理句柄资源中的某个句柄资源
    curl_multi_remove_handle($mh, $conn[$i]);

    //关闭cURL会话
    curl_close($conn[$i]);
}

//关闭全部句柄
curl_multi_close($mh);

//var_dump($res);