最快的速度获取网页所有图片的长和宽。
不知道大家有没有玩过 http://pinterest.com ？注册后，它有一个 add a pin， 当你提交一个网站的URL后，按Find Images时，它可以查找你提交网页上所有图片的（并进行长和宽条件的筛选），整个过程一般在10秒左右。
最近想模仿它，做一个小功能组件。已经摒弃掉万恶的 getimagesize() （需要48.64秒），换用 imagecreatefromstring（）（还是需要26.13秒），和它10秒左右的成绩，简直是天壤之别。
要考虑 TCP 连接数，要做到服务器资源最省化，还要考虑执行时间最少化。求助万能的大虾们，如何继续优化代码？可以跑的更快些。
<br /><br />function ranger($url){<br /> $headers = array( "Range: bytes=0-32768" );<br /> $curl = curl_init($url);<br /> curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);<br /> curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);<br /> return curl_exec($curl);<br /> curl_close($curl);<br />}//curl设置<br /><br />require dirname(__FILE__) . '/simple_html_dom.php'; <br />//采用simple_html_dom.php分析HTML nod<br /><br />$url = 'http://www.huffingtonpost.com/';<br /><br />$html = file_get_html($url);<br />if($html->find('img')){<br /> foreach($html->find('img') as $element) {<br /> $raw = ranger($element->src);<br /> $im = @imagecreatefromstring($raw);<br /> $width = @imagesx($im);<br /> $height = @imagesy($im);<br /> if($width>=200||$height>=200){<br /> echo $element;//得出长大于大于200，宽大于等于200的图片<br /> }<br /> }<br />}<br /><br />http://s.huffpost.com/images/v/logos/v4/tagline.gif<br />http://s.huffpost.com/images/v/logos/v4/homepage.gif?v9<br />http://i.huffpost.com/gen/559399/thumbs/r-OLBERMANN-huge.jpg<br />http://s.huffpost.com/images/facebook_promo_connect.png?3<br />http://images.huffingtonpost.com/2012-04-04-michaeljfoxmarlo2SECOND.jpg<br />http://images.huffingtonpost.com/2012-04-05-Screenshot20120405at9.40.24AM.jpg<br />http://i.huffpost.com/gen/557914/thumbs/s-SCORSESE-large300.jpg<br />
foreach($html->find('img') as $element) {<br /> tenor("tenorcall.php?v=$element->src");<br /> }<br />}<br />function ranger($url){<br /> $headers = array( "Range: bytes=0-32768" );<br /> $curl = curl_init($url);<br /> curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);<br /> curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);<br /> return curl_exec($curl);<br /> curl_close($curl);<br />}//curl设置<br /><br /> $raw = ranger($_GET['v']);<br /> $im = @imagecreatefromstring($raw);<br /> $width = @imagesx($im);<br /> $height = @imagesy($im);<br /> if($width>=200<br><font color='#FF8000'>------解决思路----------------------</font><br>$height>=200){<br /> file_put_contents('tenorcall.txt', $_GET['v'].PHP_EOL, FILE_APPEND );//得出长大于大于200，宽大于等于200的图片<br /> }<br />/**<br /> * 函数 tenor<br /> * 功能 启动一个url，但不等待返回<br /> * 参数 $page，待执行的页面程序<br /> * 返回 无<br /> **/<br />if(! function_exists('tenor')):<br />function tenor($page) {<br /> $host = $_SERVER["HTTP_HOST"];<br /> $fp = fsockopen($host, 80, $errno, $errmsg);<br /> if(!$fp) {<br /> echo "$errstr ($errno)<br>\n";<br /> } else {<br /> fputs($fp,"GET /$page HTTP/1.0\nHost: $host\n\n");<br /> fclose($fp);<br /> }<br />}<br />endif;<br />images: [http://s.huffpost.com/images/v/logos/v4/homepage.gif?v9,…]<br />0: "http://s.huffpost.com/images/v/logos/v4/homepage.gif?v9"<br />1: "http://s.huffpost.com/images/v/logos/v4/tagline.gif"<br />2: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />3: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />4: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />5: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />6: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />7: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />8: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />9: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />10: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />11: "http://s.huffpost.com/images/splash/t_mini-a.png"<br />12: 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