PHP 5.3 以上版本,使用pthreads PHP擴(kuò)展,可以使PHP真正地支持多線程。多線程在處理重復(fù)性的循環(huán)任務(wù),能夠大大縮短程序執(zhí)行時(shí)間。
大多數(shù)網(wǎng)站的性能瓶頸不在PHP
服務(wù)器上,因?yàn)樗梢院?jiǎn)單地通過(guò)橫向增加服務(wù)器或CPU核數(shù)來(lái)輕松應(yīng)對(duì)(對(duì)于各種
云主機(jī),增加vps或CPU核數(shù)就更方便了,直接以備份鏡像增加VPS,連操作系統(tǒng)、環(huán)境都不用安裝配置),而是在于MySQL數(shù)據(jù)庫(kù)。如果用 MySQL 數(shù)據(jù)庫(kù),一條聯(lián)合查詢(xún)的SQL,也許就可以處理完業(yè)務(wù)邏輯,但是,遇到大量并發(fā)請(qǐng)求,就歇菜了。如果用 NOSQL 數(shù)據(jù)庫(kù),也許需要十次查詢(xún),才能處理完同樣地業(yè)務(wù)邏輯,但每次查詢(xún)都比 MySQL 要快,十次循環(huán)NoSQL查詢(xún)也許比一次MySQL聯(lián)合查詢(xún)更快,應(yīng)對(duì)幾萬(wàn)次/秒的查詢(xún)完全沒(méi)問(wèn)題。如果加上PHP多線程,通過(guò)十個(gè)線程同時(shí)查詢(xún)NoSQL,返回結(jié)果匯總輸出,速度就要更快了。我們實(shí)際的APP產(chǎn)品中,調(diào)用一個(gè)通過(guò)用戶(hù)喜好實(shí)時(shí)推薦商品的PHP接口,PHP需要對(duì)BigSea NoSql數(shù)據(jù)庫(kù)發(fā)起500~1000次查詢(xún),來(lái)實(shí)時(shí)算出用戶(hù)的個(gè)性喜好商品數(shù)據(jù),PHP多線程的作用非常明顯。
PHP擴(kuò)展下載:https://github.com/krakjoe/pthreads
PHP手冊(cè)文檔:http://php.net/manual/zh/book.pthreads.php
1、擴(kuò)展的編譯安裝(Linux),編輯參數(shù) --enable-maintainer-zts 是必選項(xiàng):
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- cd /Data/tgz/php-5.5.1
- ./configure --prefix=/Data/apps/php --with-config-file-path=/Data/apps/php/etc --with-mysql=/Data/apps/mysql --with-mysqli=/Data/apps/mysql/bin/mysql_config --with-iconv-dir --with-freetype-dir=/Data/apps/libs --with-jpeg-dir=/Data/apps/libs --with-png-dir=/Data/apps/libs --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-fpm --enable-mbstring --with-mcrypt=/Data/apps/libs --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --enable-opcache --with-pdo-mysql --enable-maintainer-zts
- make clean
- make
- make install
-
- unzip pthreads-master.zip
- cd pthreads-master
- /Data/apps/php/bin/phpize
- ./configure --with-php-config=/Data/apps/php/bin/php-config
- make
- make install
-
- vi /Data/apps/php/etc/php.ini
- 添加extension = "pthreads.so"
2、給出一段PHP多線程、與For循環(huán),抓取百度搜索頁(yè)面的PHP代碼示例:
-
- class test_thread_run extends Thread
- {
- public $url;
- public $data;
-
- public function __construct($url)
- {
- $this->url = $url;
- }
-
- public function run()
- {
- if(($url = $this->url))
- {
- $this->data = model_http_curl_get($url);
- }
- }
- }
-
- function model_thread_result_get($urls_array)
- {
- foreach ($urls_array as $key => $value)
- {
- $thread_array[$key] = new test_thread_run($value["url"]);
- $thread_array[$key]->start();
- }
-
- foreach ($thread_array as $thread_array_key => $thread_array_value)
- {
- while($thread_array[$thread_array_key]->isRunning())
- {
- usleep(10);
- }
- if($thread_array[$thread_array_key]->join())
- {
- $variable_data[$thread_array_key] = $thread_array[$thread_array_key]->data;
- }
- }
- return $variable_data;
- }
-
- function model_http_curl_get($url,$userAgent="")
- {
- $userAgent = $userAgent ? $userAgent : 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)';
- $curl = curl_init();
- curl_setopt($curl, CURLOPT_URL, $url);
- curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
- curl_setopt($curl, CURLOPT_TIMEOUT, 5);
- curl_setopt($curl, CURLOPT_USERAGENT, $userAgent);
- $result = curl_exec($curl);
- curl_close($curl);
- return $result;
- }
-
- for ($i=0; $i < 100; $i++)
- {
- $urls_array[] = array("name" => "baidu", "url" => "http://www.baidu.com/s?wd=".mt_rand(10000,20000));
- }
-
- $t = microtime(true);
- $result = model_thread_result_get($urls_array);
- $e = microtime(true);
- echo "多線程:".($e-$t)."\n";
-
- $t = microtime(true);
- foreach ($urls_array as $key => $value)
- {
- $result_new[$key] = model_http_curl_get($value["url"]);
- }
- $e = microtime(true);
- echo "For循環(huán):".($e-$t)."\n";
- ?>
網(wǎng)頁(yè)題目:PHP多線程的使用
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