通过WEB服务器来实现PHP多线程功能,当然,对多线程有深入理解的人都知道通过WEB服务器实现的多线程只能模仿多线程的一些效果,并不是真正意义上的多线程.
但不管怎么样,它还是能满足我们的一些需要的,在需要类似多线程的功能方面还是可以采用这个类,代码如下:
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class thread {
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var $hooks = array();
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var $args = array();
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function thread() {
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}
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function addthread($func)
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{
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$args = array_slice(func_get_args(), 1);
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$this->hooks[] = $func;
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$this->args[] = $args;
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return true;
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}
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function runthread()
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{
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if(isset($_GET['flag']))
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{
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$flag = intval($_GET['flag']);
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}
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if($flag || $flag === 0)
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{
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call_user_func_array($this->hooks[$flag], $this->args[$flag]);
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}
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else
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{
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for($i = 0, $size = count($this->hooks); $i < $size; $i++)
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{
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$fp=fsockopen($_SERVER['HTTP_HOST'],$_SERVER['SERVER_PORT']);
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if($fp)
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{
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$out = "GET {$_SERVER['PHP_SELF']}?flag=$i HTTP/1.1rn";
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$out .= "Host: {$_SERVER['HTTP_HOST']}rn";
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$out .= "Connection: Closernrn";
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fputs($fp,$out);
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fclose($fp);
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}
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}
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}
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}
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}
使用方法,代码如下:
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$thread = new thread();
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$thread->addthread('func1','info1');
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$thread->addthread('func2','info2');
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$thread->addthread('func3','info3');
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$thread->runthread();
说明:
addthread() 是添加线程函数,第一个参数是函数名,之后的参数(可选)为传递给指定函数的参数.
runthread() 是执行线程的函数.
PHP实例:利用curl实现多线程下载图片
其实是php利用curl实现的一个多线程类,有了这个类,我们也可利用该类执行多线程任务了,代码如下:
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class curl_multi{
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private $url_list=array();
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private $curl_setopt=array(
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'CURLOPT_RETURNTRANSFER' => 1,
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'CURLOPT_HEADER' => 0,
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'CURLOPT_NOBODY' => 0,
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'CURLOPT_FOLLOWLOCATION' => 0,
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'CURLOPT_TIMEOUT' => 6
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);
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function __construct($seconds=30){
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set_time_limit($seconds);
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}
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public function setUrlList($list=array()){
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$this->url_list=$list;
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}
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public function setOpt($cutPot){
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$this->curl_setopt=$cutPot+$this->curl_setopt;
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}
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public function execute(){
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$mh=curl_multi_init();
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foreach($this->url_list as $i=>$url){
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$conn[$i]=curl_init($url);
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foreach($this->curl_setopt as $key => $val){
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curl_setopt($conn[$i],preg_replace('/(CURLOPT_w{1,})/ie','$0',$key),$val);
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}
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curl_multi_add_handle($mh,$conn[$i]);
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}
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$active=false;
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do{
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$mrc=curl_multi_exec($mh,$active);
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}while($mrc == CURLM_CALL_MULTI_PERFORM);
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while($active and $mrc == CURLM_OK){
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if(curl_multi_select($mh) != -1){
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do{
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$mrc=curl_multi_exec($mh,$active);
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}while($mrc == CURLM_CALL_MULTI_PERFORM);
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}
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}
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$res=array();
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foreach($this->url_list as $i => $url){
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$res[$i]=curl_multi_getcontent($conn[$i]);
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curl_close($conn[$i]);
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curl_multi_remove_handle($mh,$conn[$i]);
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}
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curl_multi_close($mh);
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return $res;
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}
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}
php使用多线程下载类示例,下载远程图片,代码如下:
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$curl_mul=new curl_multi();
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$curl_mul->setUrlList(array('http://www.vcphp.com/img/logo.jpg','http://www.vcphp.com/img/logo.jpg','http://www.vcphp.com/img/logo.jpg'));
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$a=$curl_mul->execute();
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$i=1;
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foreach($a as $v){
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$filename=$i.'.gif';
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$fp2=@fopen($filename,'a');
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fwrite($fp2,$v);
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fclose($fp2);
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$i++;
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}
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