The method of using curl to implement multithreading in PHP _php techniques

The example of this article is about the way to implement multithreading in PHP with Curl. Share to everyone for your reference, specific as follows:

Multithreading is not supported by PHP, but we can use foreach to pseudo multithreading, but this pseudo-multithreading speed is not necessarily a single path to where to go, specifically to see an example.

In the use of the foreach statement loop picture URL, and through the curl of all the pictures to save the local function, there is only one problem can be collected, now the foreach and curl combined with multiple URL request method to summarize.

Method 1: Circular Request

$SR =array (url_1,url_2,url_3);
foreach ($sr as $k => $v) {
 $curlPost = $v. ' f= incoming parameters ';
 $ch = Curl_init ($curlPost);
 curl_setopt ($ch, Curlopt_returntransfer, true); Gets the data returns
 curl_setopt ($ch, Curlopt_binarytransfer, True),//////$DATA returns the fetch data when the Curlopt_returntransfer is enabled
 = Curl_ EXEC ($ch);
 echo $k. ' # #: '. $data. ' <br> ';
}
Curl_close ($ch);

The above code needs special attention is that curl_close must be placed in the end of the Foreach loop, if placed inside, it will appear I mentioned above the multiple imgurl, can only collect a URL problem.

Method 2: Multithreading loops

<?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 (
 ' http://www.jb51.net ',
 ' http://tools.jb51.net ',
));

Here the main use of curl_multi_init () to implement multiple URL requests, but because PHP itself does not support multithreading, so the pseudo-multithreaded speed is not necessarily faster than the single thread.

More about PHP Interested readers can view the site topics: "Php Curl Usage Summary", "PHP array" operation Skills Daquan, "PHP Sorting algorithm Summary", "PHP common traversal algorithm and skills summary", "PHP Data structure and algorithm tutorial", " PHP Programming algorithm Summary, "PHP Mathematical Calculation Skills Summary", "PHP Regular Expression Usage summary", "PHP operation and operator Usage Summary", "PHP string (String) Usage summary" and "PHP common database Operation skill Summary"

I hope this article will help you with the PHP program design.