About the processing of multi-threading in PHP

The following is about the PHP multithreading problem, php pthreads extension and curl_multi_init function, when you encounter such problems will not be solved, see how others are solved.

Windows install PHP Real multi-threaded extension pthreads tutorial

Extension Address: http://docs.php.net/manual/zh/book.pthreads.php
Precautions
php5.3 or more, and is a thread-safe version. The compilers used by Apache and PHP must be consistent.
Thread-safe version is phpinfo () to view thread safety as enabled.
You can see the compiler that is used by phpinfo () to view the compiler item. my: MSVC9 (Visual C + + 2008).
Use environment
32-bit Windows XP Sp3,wampserver2.2d (PHP5.3.10-VC9 + apache2.2.21-vc9).
First, download pthreads extension
Download Address: Http://windows.php.net/downloads/pecl/releases/pthreads
According to my environment, I downloaded the pthreads-2.0.8-5.3-ts-vc9-x86.
2.0.8 represents the version of Pthreads.
5.3 Represents the version of PHP.
TS indicates that PHP wants a thread-safe version.
Vc9 means that PHP is compiled by the Visual C + + 2008 compiler.
The x86 represents a 32-bit

Second, install pthreads extension
Copy the Php_pthreads.dll to the directory bin\php\ext\ below. (I path D:\wamp\bin\php\php5.3.10\ext)
Copy the PthreadVC2.dll to the directory bin\php\ below. (I path D:\wamp\bin\php\php5.3.10)
Copy the PthreadVC2.dll to the directory C:\windows\system32 below.
Open php config file php.ini. Add Extension=php_pthreads.dll to the back.
Tips! The Windows system needs to include the path of the PthreadVC2.dll into the PATH environment variable. My Computer---> Right---> Properties---> Advanced---> Environment variables---> System variables---> Find---> Edit---> Named path At the end of the variable value, add the full path to the PthreadVC2.dll (my C:\WINDOWS\system32\pthreadVC2.dll).
Third, test pthreads extension

Class AsyncOperation extends \thread {public    function __construct ($arg) {        $this->arg = $arg;    }    Public Function Run () {        if ($this->arg) {            printf ("Hello%s\n", $this->arg);        }    }} $thread = new AsyncOperation ("World"), if ($thread->start ())    $thread->join (); >

Running the above code appears Hello world, indicating that the pthreads extension was successfully installed!

Attach a Thinkphp3.2.2 simple example

<?phpnamespace Home\controller;class Test extends \thread {public $url;        public $result;    Public function __construct ($url) {$this->url = $url; Public Function Run () {if ($this->url) {$this->result = model_http_curl_get ($this->u        RL);      }}}function Model_http_curl_get ($url) {$curl = Curl_init ();      curl_setopt ($curl, Curlopt_url, $url);      curl_setopt ($curl, Curlopt_returntransfer, 1);      curl_setopt ($curl, Curlopt_timeout, 5); curl_setopt ($curl, Curlopt_useragent, ' mozilla/4.0 (compatible; MSIE 7.0;      Windows NT 5.2) ');      $result = curl_exec ($curl);      Curl_close ($curl);  return $result; }for ($i = 0; $i < $i + +) {$urls [] = ' http://www.baidu.com/s?wd= '. Rand (10000, 20000);    /* Multithreaded Speed Test */$t = Microtime (True); foreach ($urls as $key = = $url) {$workers [$key] = new test ($url); $workers [$key]->start ();} foreach ($workers as $key = + $worker) {while ($workers [$key]->isrunNing ()) {usleep (100);    } if ($workers [$key]->join ()) {Dump ($workers [$key]->result); }} $e = Microtime (true); echo "Multithreading Time:". ($e-$t). "  Seconds <br> "; /* Single-threaded speed Test */$t = Microtime (True); foreach ($urls as $key = = $url) {dump (Model_http_curl_get ($url));} $e = Microtime (true); echo "For loop time:". ($e-$t). " Seconds <br> ";

The test results are as follows:

Multithreading time: 2.83717107772827 seconds
For loop time: 10.9415860176086 seconds

Curl_multi_init ()

<?phpecho date ("Y-m-d h:m:s", Time ()), echo "", Echo Floor (Microtime () *1000), echo "<br>", $mtime = Explode ("", Microtime ()); $mtime = $mtime [1]. ($mtime [0] * +); $mtime 2 = Explode (".", $mtime); $mtime = $mtime 2[0]; Echo $mtime, echo "<br>", $urls =array (' http://www.a.com ', ' http://www.b.com ', ' http://www.c.com ', ' http:// Www.d.com ', ' http://www.e.com '); Print_r (Async_get_url ($urls)); [0]=>example1,[1]=>example2echo "<br>", Echo date ("Y-m-d h:m:s", Time ()), echo "", Echo Floor (Microtime () *1000); echo "<br>", $mtime _ = Explode ("", Microtime ()); $mtime _ = $mtime _[1]. ($mtime _[0] * +), $mtime 2_ = Explode (".", $mtime _); $mtime _ = $mtime 2_[0]; echo $mtime _;echo "<br>", Echo $mtime _-$mtime, function Async_get_url ($url _array, $wait _usec = 0) {if (!is_array ($ Url_array)) return false; $wait _usec = Intval ($wait _usec); $data = Array (); $handle = Array (); $running = 0; $mh = curl_multi_i NIT (); Multi Curl handler$i = 0;foreach ($url _array as $url) {$ch = Curl_init (); curl_setopT ($ch, Curlopt_url, $url); curl_setopt ($ch, Curlopt_returntransfer, 1); Return don ' t printcurl_setopt ($ch, Curlopt_timeout, 30); curl_setopt ($ch, Curlopt_useragent, ' mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) ');  curl_setopt ($ch, curlopt_followlocation, 1); 302 redirectcurl_setopt ($ch, Curlopt_maxredirs, 7);  Curl_multi_add_handle ($MH, $ch); Put curl resource in multi curl handler $handle [$i + +] = $ch;}  /* Execute */do {curl_multi_exec ($MH, $running), if ($wait _usec > 0)/* How long each connect will take/usleep ($wait _usec); 250000 = 0.25 sec} while ($running > 0);/* Read data */foreach ($handle as $i = = $ch) {$content = Curl_multi_getcon  Tent ($ch); $data [$i] = (Curl_errno ($ch) = = 0)?  $content: false;}  /* Remove handle*/foreach ($handle as $ch) {Curl_multi_remove_handle ($MH, $ch);  } curl_multi_close ($MH);  return $data;} ?>

About Curl_multi_init ()

In general, when you think about using Curl_multi_init (), the goal is to request multiple URLs at the same time, instead of one in turn, or curl_init ().

However, in the use of Curl_multi, you may encounter high CPU consumption, the page suspended animation and other phenomena, you can see how to solve the Curl_multi cause the Web page suspended animation problem

The steps for using Curl_multi are summarized as follows:

First step: Call Curl_multi_init
Step two: Loop call Curl_multi_add_handle
It is important to note that the second parameter of Curl_multi_add_handle is a sub-handle from Curl_init.
Step three: Continue calling Curl_multi_exec
Fourth step: Loop call Curl_multi_getcontent as needed to get results
Fifth step: Call Curl_multi_remove_handle, and call curl_close for each word handle
Sixth step: Call Curl_multi_close

Explanation of function functions:

Curl_multi_init ()
Initializes a curl batch handle resource.

Curl_multi_add_handle ()
Adds a separate curl handle resource to the Curl batch session. The Curl_multi_add_handle () function has two parameters, the first parameter represents a curl batch handle resource, and the second parameter represents a separate curl handle resource.

Curl_multi_exec ()
Parsing a curl batch handle, the Curl_multi_exec () function has two parameters, the first parameter represents a batch handle resource, and the second parameter is a reference value parameter that represents the number of individual curl handle resources remaining to be processed.

Curl_multi_remove_handle ()
Removes a handle resource from the Curl batch handle resource, the Curl_multi_remove_handle () function has two parameters, the first parameter represents a curl batch handle resource, and the second parameter represents a separate curl handle resource.

Curl_multi_close ()
Closes a batch handle resource.

Curl_multi_getcontent ()
Returns the text stream of the obtained output, in the case of a curlopt_returntransfer set.

Curl_multi_info_read ()
Gets the related transport information for the currently resolved curl.

This article PHP multi-threaded issues to share, I hope to be helpful to everyone, if there are questions you can express comments or suggestions. Later small series will also share a lot of articles on this kind, please pay attention to.