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Analysis of methods for implementing multi-threading using foreach combined with curl in PHP
Analysis of methods for implementing multi-threading using foreach combined with curl in PHP
Dec 21, 2016 am 11:46 AM
The example in this article describes the method of using foreach combined with curl to achieve multi-threading in PHP. Share it with everyone for your reference, the details are as follows:
Multi-threading is not supported by PHP, but we can use foreach to pseudo-multi-thread, but this pseudo-multi-threading is not necessarily faster than single-threading. Specifically, Let’s look at an example.
When using the foreach statement to loop through image URLs and save all images locally through CURL, a problem arises that only one can be collected. Now we will combine foreach and CURL to make multiple URL requests. Summary below.
Method 1: Loop request
$sr=array(url_1,url_2,url_3);
foreach ($sr as $k=>$v) {
$curlPost=$v.'?f=傳入?yún)?shù)';
$ch = curl_init($curlPost) ;
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 獲取數(shù)據(jù)返回
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true) ; // 在啟用 CURLOPT_RETURNTRANSFER 時(shí)候?qū)@取數(shù)據(jù)返回
$data = curl_exec($ch) ;
echo $k.'##:'.$data.'<br>';
}
curl_close($ch);
What needs special attention in the above code is that curl_close must be placed outside the end of the foreach loop. If it is placed inside, the problem I mentioned above will appear. Multiple IMGURLs can only collect one URL.
Method 2: Multi-threaded loop
<?php
multi_threads_request($nodes){
$mh = curl_multi_init();
$curl_array = array();
foreach($nodes as $i => $url)
{
$curl_array[$i] = curl_init($url);
curl_setopt($curl_array[$i], CURLOPT_RETURNTRANSFER, true);
curl_multi_add_handle($mh, $curl_array[$i]);
}
$running = NULL;
do {
usleep(10000);
curl_multi_exec($mh,$running);
} while($running > 0);
$res = array();
foreach($nodes as $i => $url)
{
$res[$url] = curl_multi_getcontent($curl_array[$i]);
}
foreach($nodes as $i => $url){
curl_multi_remove_handle($mh, $curl_array[$i]);
}
curl_multi_close($mh);
return $res;
}
print_r(multi_threads_request(array(
'http://www.miracleart.cn',
'http://tools.php.cn',
));
Here we mainly use curl_multi_init() to implement multiple url requests, but because PHP itself does not support multi-threading , so the speed of pseudo-multithreading is not necessarily faster than that of single-threading.
I hope this article will be helpful to everyone in PHP programming.
For more analysis on the method of foreach combined with curl to achieve multi-threading in PHP, please pay attention to the PHP Chinese website!
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