如何使用cURL与PHP同时打开多个URL？

概述这是我现在的代码： $SQL = mysql_query("SELECT url FROM urls") or die(mysql_error()); //Query the urls tablewhile($resultSet = mysql_fetch_array($SQL)){ //Put all the urls into one variable // 这是我现在的代码：

$sql = MysqL_query("SELECT url FROM urls") or dIE(MysqL_error()); //query the urls tablewhile($resultSet = MysqL_fetch_array($sql)){ //Put all the urls into one variable                // Now for some cURL to run it.            $ch = curl_init($resultSet['url']); //load the urls            curl_setopt($ch,CURLOPT_TIMEOUT,2); //No need to wait for it to load. Execute it and go.            curl_exec($ch); //Execute            curl_close($ch); //Close it off         } //While loop

我对cURL来说比较新.通过比较新的,我的意思是这是我第一次使用cURL.目前它加载一个2秒钟,然后加载下一个2秒,然后下一个.但是,我想同时加载所有这些.我确信它是可能的,我只是不确定如何.如果有人能指出我正确的方向,我会很感激.

解决方法 您以相同的方式设置每个cURL句柄,然后将它们添加到curl_multi_句柄.要查看的功能是curl_multi_ *功能 documented here.然而,根据我的经验,尝试一次加载太多的URL时出现问题(尽管我目前无法找到我的笔记),所以最后一次我使用curl_mutli_,我一次设置了一批5个URL.

编辑：这是一个缩减版本的代码,我使用curl_multi_：

编辑：稍微重写和许多添加的评论,希望会有所帮助.

// -- create all the indivIDual cURL handles and set their options$curl_handles = array();foreach ($urls as $url) {    $curl_handles[$url] = curl_init();    curl_setopt($curl_handles[$url],CURLOPT_URL,$url);    // set other curl options here}// -- start going through the cURL handles and running them$curl_multi_handle = curl_multi_init();$i = 0; // count where we are in the List so we can break up the runs into smaller blocks$block = array(); // to accumulate the curl_handles for each group we'll run simultaneouslyforeach ($curl_handles as $a_curl_handle) {    $i++; // increment the position-counter    // add the handle to the curl_multi_handle and to our tracking "block"    curl_multi_add_handle($curl_multi_handle,$a_curl_handle);    $block[] = $a_curl_handle;    // -- check to see if we've got a "full block" to run or if we're at the end of out List of handles    if (($i % BLOCK_SIZE == 0) or ($i == count($curl_handles))) {        // -- run the block        $running = NulL;        do {            // track the prevIoUs loop's number of handles still running so we can tell if it changes            $running_before = $running;            // run the block or check on the running block and get the number of sites still running in $running            curl_multi_exec($curl_multi_handle,$running);            // if the number of sites still running changed,print out a message with the number of sites that are still running.            if ($running != $running_before) {                echo("Waiting for $running sites to finish...\n");            }        } while ($running > 0);        // -- once the number still running is 0,curl_multi_ is done,so check the results        foreach ($block as $handle) {            // http response code            $code = curl_getinfo($handle,CURliNFO_http_CODE);            // cURL error number            $curl_errno = curl_errno($handle);            // cURL error message            $curl_error = curl_error($handle);            // output if there was an error            if ($curl_error) {                echo("    *** cURL error: ($curl_errno) $curl_error\n");            }            // remove the (used) handle from the curl_multi_handle            curl_multi_remove_handle($curl_multi_handle,$handle);        }        // reset the block to empty,since we've run its curl_handles        $block = array();    }}// close the curl_multi_handle once we're donecurl_multi_close($curl_multi_handle);

考虑到你不需要任何东西从URL,你可能不需要很多的东西,但这是我如何将请求块块BLOCK_SIZE,等待每个块运行,然后继续前进,并抓住来自cURL的错误.

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