关于php curl异步并发请求http【PHP教程】

概述关于php curl异步并发请求http

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先来看下同步的代码以及请求时间。

$start_time=date("h:i:sa");for ($i=0; $i <100 ; $i++) { 	$urls[]="http://www.downxia.com/downinfo/2315".$i.".HTML";	GetTitle(geturl("http://www.downxia.com/downinfo/2315".$i.".HTML"));}function geturl($url){               $ch = curl_init();        curl_setopt($ch, CURLOPT_URL, $url);        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);                $output = curl_exec($ch);        curl_close($ch);        return $output;}function GetTitle($output){	preg_match('/<Title>.*<\\/Title>/i',$output,$matches);	var_dump($matches[0]);}$end_time=date("h:i:sa");echo '开始时间是：'.$start_time;echo '结束时间是：'.$end_time;

最下面可以看到时间花了27秒。

接下来看下PHP curl 异步并发请求http的代码以及花费时间。

$start_time=date("h:i:sa");$urls=[];for ($i=0; $i <100 ; $i++) { 	$urls[]="http://www.downxia.com/downinfo/2315".$i.".HTML";}var_dump($urls);// GetTitle('klasjdkla<Title>313asds12</Title>');rolling_curl($urls,'GetTitle');function GetTitle($output){	preg_match('/<Title>.*<\\/Title>/i',$output,$matches);	var_dump($matches[0]);}$end_time=date("h:i:sa");echo '开始时间是：'.$start_time;echo '结束时间是：'.$end_time;function rolling_curl($urls, $callback, $custom_options = null){//多个url访问    // make sure the rolling window isn't greater than the # of urls    $rolling_window = 5;    $rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;    $master   = curl_multi_init();    $curl_arr = array();    // add additional curl options here    $std_options = array(        CURLOPT_RETURNTRANSFER => true,        CURLOPT_FolLOWLOCATION => true,        CURLOPT_MAXREDirs      => 5        );    $options = ($custom_options) ? ($std_options + $custom_options) : $std_options;    // start the first batch of requests    for ($i = 0; $i < $rolling_window; $i++) {        $ch                   = curl_init();        $options[CURLOPT_URL] = $urls[$i];        curl_setopt_array($ch, $options);        curl_multi_add_handle($master, $ch);    }    do {        while (($execrun = curl_multi_exec($master, $running)) == CURLM_CALL_MulTI_PERFORM);        if ($execrun != CURLM_OK) {            break;        }        // a request was just completed -- find out which one        while ($done = curl_multi_info_read($master)) {            $info = curl_getinfo($done['handle']);            if ($info['http_code'] == 200) {                $output = curl_multi_getcontent($done['handle']);                // request successful.  process output using the callback function.                $callback($output);                // start a new request (it's important to do this before removing the old one)                $ch                   = curl_init();                $options[CURLOPT_URL] = $urls[$i++]; // increment i                curl_setopt_array($ch, $options);                curl_multi_add_handle($master, $ch);                // remove the curl handle that just completed                curl_multi_remove_handle($master, $done['handle']);            } else {                // request Failed.  add error handling.            }        }    } while ($running);    curl_multi_close($master);    return true;}

才花了3秒？实际上我感觉应该是花了5秒，因为启动比同步要慢，开始的时候卡了2秒。

http请求效率，毋庸置疑是异步远远高于同步。

核心请求代码如下：（这是老外写的，有点小问题，最后的提示undefined offset）

function rolling_curl($urls, $callback, $custom_options = null){//多个url访问    // make sure the rolling window isn't greater than the # of urls    $rolling_window = 5;    $rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;    $master   = curl_multi_init();    $curl_arr = array();    // add additional curl options here    $std_options = array(        CURLOPT_RETURNTRANSFER => true,        CURLOPT_FolLOWLOCATION => true,        CURLOPT_MAXREDirs      => 5        );    $options = ($custom_options) ? ($std_options + $custom_options) : $std_options;    // start the first batch of requests    for ($i = 0; $i < $rolling_window; $i++) {        $ch                   = curl_init();        $options[CURLOPT_URL] = $urls[$i];        curl_setopt_array($ch, $options);        curl_multi_add_handle($master, $ch);    }    do {        while (($execrun = curl_multi_exec($master, $running)) == CURLM_CALL_MulTI_PERFORM);        if ($execrun != CURLM_OK) {            break;        }        // a request was just completed -- find out which one        while ($done = curl_multi_info_read($master)) {            $info = curl_getinfo($done['handle']);            if ($info['http_code'] == 200) {                $output = curl_multi_getcontent($done['handle']);                // request successful.  process output using the callback function.                $callback($output);                // start a new request (it's important to do this before removing the old one)                $ch                   = curl_init();                $options[CURLOPT_URL] = $urls[$i++]; // increment i                curl_setopt_array($ch, $options);                curl_multi_add_handle($master, $ch);                // remove the curl handle that just completed                curl_multi_remove_handle($master, $done['handle']);            } else {                // request Failed.  add error handling.            }        }    } while ($running);    curl_multi_close($master);    return true;}

修改一下。只要在新增url的时候加个判断就好了。// 当$i等于$urls数组大小时不用再增加了。

function rolling_curl($urls, $callback, $custom_options = null){//多个url访问    // make sure the rolling window isn't greater than the # of urls    $rolling_window = 5;    $rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;    $master   = curl_multi_init();    $curl_arr = array();    // add additional curl options here    $std_options = array(        CURLOPT_RETURNTRANSFER => true,        CURLOPT_FolLOWLOCATION => true,        CURLOPT_MAXREDirs      => 5        );    $options = ($custom_options) ? ($std_options + $custom_options) : $std_options;    // start the first batch of requests    for ($i = 0; $i < $rolling_window; $i++) {        $ch                   = curl_init();        $options[CURLOPT_URL] = $urls[$i];        curl_setopt_array($ch, $options);        curl_multi_add_handle($master, $ch);    }    do {        while (($execrun = curl_multi_exec($master, $running)) == CURLM_CALL_MulTI_PERFORM);        if ($execrun != CURLM_OK) {            break;        }        // a request was just completed -- find out which one        while ($done = curl_multi_info_read($master)) {            $info = curl_getinfo($done['handle']);            if ($info['http_code'] == 200) {                $output = curl_multi_getcontent($done['handle']);                // request successful.  process output using the callback function.                $callback($output);                // start a new request (it's important to do this before removing the old one)                // 当$i等于$urls数组大小时不用再增加了                if($i<sizeof($urls)){                    $ch                   = curl_init();                    $options[CURLOPT_URL] = $urls[$i++]; // increment i                    curl_setopt_array($ch, $options);                    curl_multi_add_handle($master, $ch);                }                // remove the curl handle that just completed                curl_multi_remove_handle($master, $done['handle']);            } else {                // request Failed.  add error handling.            }        }    } while ($running);    curl_multi_close($master);    return true;}

以上，结束。记录一下，以免自己忘记。 总结

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