Use curl concurrency to improve page access speed_PHP tutorial

In our daily programs, it is inevitable to access several interfaces at the same time. When we usually use curl to access, it is usually a single and sequential access. If there are 3 interfaces, each interface takes time 500 milliseconds, then our three interfaces will take 1500 milliseconds. This problem is too troublesome and seriously affects the page access speed. Is it possible to increase the speed by concurrent access? Today I will briefly talk about using curl concurrency to improve page access speed.
I hope you can give me more guidance.
1. Old curl access method and time-consuming statistics

function curl_fetch($url, $timeout=3){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $data = curl_exec($ch);
    $errno = curl_errno($ch);
    if ($errno>0) {
        $data = false;
    }
    curl_close($ch);
    return $data;
}
function microtime_float()
{
   list($usec, $sec) = explode(" ", microtime());
   return ((float)$usec + (float)$sec);
}
$url_arr=array(
     "taobao"=>"http://www.taobao.com",
     "sohu"=>"http://www.sohu.com",
     "sina"=>"http://www.sina.com.cn",
     );
 $time_start = microtime_float();
 $data=array();
 foreach ($url_arr as $key=>$val)
 {
     $data[$key]=curl_fetch($val);
 }
 $time_end = microtime_float();
 $time = $time_end - $time_start;
 echo "耗时:{$time}";
?>

　

Time consumption: 0.614 seconds
2. Curl concurrent access method and time-consuming statistics

<?php
function curl_multi_fetch($urlarr=array()){
    $result=$res=$ch=array();
    $nch = 0;
    $mh = curl_multi_init();
    foreach ($urlarr as $nk => $url) {
        $timeout=2;
        $ch[$nch] = curl_init();
        curl_setopt_array($ch[$nch], array(
        CURLOPT_URL => $url,
        CURLOPT_HEADER => false,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => $timeout,
        ));
        curl_multi_add_handle($mh, $ch[$nch]);
        ++$nch;
    }
    /* wait for performing request */
    do {
        $mrc = curl_multi_exec($mh, $running);
    } while (CURLM_CALL_MULTI_PERFORM == $mrc);
 
    while ($running && $mrc == CURLM_OK) {
        // wait for network
        if (curl_multi_select($mh, 0.5) > -1) {
            // pull in new data;
            do {
                $mrc = curl_multi_exec($mh, $running);
            } while (CURLM_CALL_MULTI_PERFORM == $mrc);
        }
    }
 
    if ($mrc != CURLM_OK) {
        error_log("CURL Data Error");
    }
 
    /* get data */
    $nch = 0;
    foreach ($urlarr as $moudle=>$node) {
        if (($err = curl_error($ch[$nch])) == '') {
            $res[$nch]=curl_multi_getcontent($ch[$nch]);
            $result[$moudle]=$res[$nch];
        }
        else
        {
            error_log("curl error");
        }
        curl_multi_remove_handle($mh,$ch[$nch]);
        curl_close($ch[$nch]);
        ++$nch;
    }
    curl_multi_close($mh);
    return  $result;
}
$url_arr=array(
     "taobao"=>"http://www.taobao.com",
     "sohu"=>"http://www.sohu.com",
     "sina"=>"http://www.sina.com.cn",
     );
function microtime_float()
{
   list($usec, $sec) = explode(" ", microtime());
   return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
$data=curl_multi_fetch($url_arr);
$time_end = microtime_float();
$time = $time_end - $time_start;
 echo "耗时:{$time}";
?>

Output result array('taobao'=>result,'sina'=>result,'baidu'=>result)　;

​

Time consuming: 0.316 seconds
The time of accessing the back-end interface for the entire page of Handsome Bar is saved in half
3. Curl related parameters
From: http://cn2.php .net/manual/en/ref.curl.php
curl_close — Close a cURL session
curl_copy_handle — Copy a cURL handle along with all of its preferences
curl_errno — Return the last error number
curl_error — Return a string containing the last error for the current session
curl_exec — Perform a cURL session
curl_getinfo — Get information regarding a specific transfer
curl_init — Initialize a cURL session
curl_multi_add_handle — Add a normal cURL handle to a cURL multi handle
curl_multi_close — Close a set of cURL handles
curl_multi_exec — Run the sub-connections of the current cURL handle
curl_multi_getcontent — Return the content of a cURL handle if CURLOPT_RETURNTRANSFER is set
curl_multi_info_read — Get information about the current transfers
curl_multi_init — Returns a new cURL multi handle
curl_multi_remove_handle — Remove a multi handle from a set of cURL handles
curl_multi_select — Wait for activity on any curl_multi connection
curl_setopt_array — Set multiple options for a cURL transfer
curl_setopt — Set an option for a cURL transfer
curl_version — Gets cURL version information

Original address: http://www.searchtb.com/2010 /12/using-multicurl-to-improve-performance.html?spm=0.0.0.0.onjnnY

http://www.bkjia.com/PHPjc/749284.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/749284.htmlTechArticleIn our usual programs, it is inevitable to access several interfaces at the same time. When we usually use curl to access , generally a single, sequential access, if there are 3 interfaces, each...