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這篇文章主要介紹了PHP多線程之內(nèi)部多線程,實(shí)例分析了php多線程的使用技巧,具有一定參考借鑒價(jià)值,需要的朋友可以參考下

本文實(shí)例分析了PHP多線程之內(nèi)部多線程用法。分享給大家供大家參考。具體如下：

代碼如下:

<?php

class Http_MultiRequest

{

//要并行抓取的url 列表

private $urls = array();

//curl 的選項(xiàng)

private $options;

//構(gòu)造函數(shù)

function __construct($options = array())

{

$this->setOptions($options);

}

//設(shè)置url 列表

function setUrls($urls)

{

$this->urls = $urls;

return $this;

}

//設(shè)置選項(xiàng)

function setOptions($options)

{

$options[CURLOPT_RETURNTRANSFER] = 1;

if (isset($options['HTTP_POST']))

{

curl_setopt($ch, CURLOPT_POST, 1);

curl_setopt($ch, CURLOPT_POSTFIELDS, $options['HTTP_POST']);

unset($options['HTTP_POST']);

}

if (!isset($options[CURLOPT_USERAGENT]))

{

$options[CURLOPT_USERAGENT] = 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;)';

}

if (!isset($options[CURLOPT_FOLLOWLOCATION]))

{

$options[CURLOPT_FOLLOWLOCATION] = 1;

}

if (!isset($options[CURLOPT_HEADER]))

{

$options[CURLOPT_HEADER] = 0;

}

$this->options = $options;

}

//并行抓取所有的內(nèi)容

function exec()

{

if(empty($this->urls) || !is_array($this->urls))

{

return false;

}

$curl = $data = array();

$mh = curl_multi_init();

foreach($this->urls as $k => $v)

{

$curl[$k] = $this->addHandle($mh, $v);

}

$this->execMulitHandle($mh);

foreach($this->urls as $k => $v)

{

$data[$k] = curl_multi_getcontent($curl[$k]);

curl_multi_remove_handle($mh, $curl[$k]);

}

curl_multi_close($mh);

return $data;

}

//只抓取一個(gè)網(wǎng)頁的內(nèi)容。

function execOne($url)

{

if (empty($url)) {

return false;

}

$ch = curl_init($url);

$this->setOneOption($ch);

$content = curl_exec($ch);

curl_close($ch);

return $content;

}

//內(nèi)部函數(shù)，設(shè)置某個(gè)handle 的選項(xiàng)

private function setOneOption($ch)

{

curl_setopt_array($ch, $this->options);

}

//添加一個(gè)新的并行抓取 handle

private function addHandle($mh, $url)

{

$ch = curl_init($url);

$this->setOneOption($ch);

curl_multi_add_handle($mh, $ch);

return $ch;

}

//并行執(zhí)行(這樣的寫法是一個(gè)常見的錯(cuò)誤，我這里還是采用這樣的寫法，這個(gè)寫法

//下載一個(gè)小文件都可能導(dǎo)致cup占用100%, 并且，這個(gè)循環(huán)會(huì)運(yùn)行10萬次以上

//這是一個(gè)典型的不懂原理產(chǎn)生的錯(cuò)誤。這個(gè)錯(cuò)誤在PHP官方的文檔上都相當(dāng)?shù)某Ｒ姟＃?/P>

private function execMulitHandle($mh)

{

$running = null;

do {

curl_multi_exec($mh, $running);

} while ($running > 0);

}

}

/*下面是上面的類的一個(gè)測(cè)試的例子：*/

$urls = array("", );

$m = new Http_MultiRequest();

$t = microtime(true);

$m->setUrls($urls);

//parallel fetch（并行抓?。?

$data = $m->exec();

$parallel_time = microtime(true) - $t;

echo $parallel_time . "\n";

$t = microtime(true);

//serial fetch（串行抓?。?

foreach ($urls as $url)

{

$data[] = $m->execOne($url);

}

$serial_time = microtime(true) - $t;

echo $serial_time . "\n";

希望本文所述對(duì)大家的php程序設(shè)計(jì)有所幫助。

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