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php curl_multi multi-threaded query example

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Jul 06, 2016 pm 01:34 PM

curlmultinbsptime

php curl_multi multi-threading examples are not used often, but if php uses multi-threading, we will use php curl_multi. Let's look at an example.

PHP itself does not have multi-threading and can be implemented with the help of extensions. However, the curl_multi* function implements the function of multi-threaded access to website data.

The steps are summarized as follows:

Step 1: Call curl_multi_init
Step 2: Call curl_multi_add_handle
in a loop What needs to be noted in this step is that the second parameter of curl_multi_add_handle is the subhandle from curl_init.
Step 3: Continue to call curl_multi_exec
Step 4: Call curl_multi_getcontent in a loop as needed to obtain the results
Step 5: Call curl_multi_remove_handle and call curl_close

for each word handle Step 6: Call curl_multi_close

代码如下

复制代码

$t=getTime();
$total=10;
for($i=0;$i $url_arr[] = "http://www.111cn.net /test";
}

$mh = curl_multi_init();
foreach ($url_arr as $i => $url) {
$conn[$i] = curl_init($url);
curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,1); // 设置返回页面输出内容
curl_multi_add_handle ($mh,$conn[$i]); // 添加线程
}
#----------------执行线程----------------
do {
$mrc = curl_multi_exec($mh,$active);
}while ($mrc == CURLM_CALL_MULTI_PERFORM);

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

foreach ($url_arr as $i => $url) {
$res[$i]=curl_multi_getcontent($conn[$i]);//得到页面输入内容
curl_multi_remove_handle($mh, $conn[$i]);
curl_close($conn[$i]);
}
curl_multi_close($mh);

foreach($res as $k=>$v){
$k=str_pad($k,2,0);
echo "$k => $v
";
}

runTime($t);
#----------- calculate time function-------------
function getTime(){
$TIME=explode(" ",microtime());
$TIME=$TIME[1].substr($TIME[0],1);
return $TIME;
}
function runTime($t,$l=3){
$dif=getTime()-$t;
echo ' '.number_format($dif,$l);
}
?>

The code is as follows

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