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。
function ranger($url){ $headers = array( "Range: bytes=0-32768" ); $curl = curl_init($url); curl_setopt($curl, CURLOPT_HTTPHEADER, $headers); curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); return curl_exec($curl); curl_close($curl);}//curl设置require dirname(__FILE__) . '/simple_html_dom.php'; //采用simple_html_dom.php分析HTML nod$url = 'http://www.huffingtonpost.com/';$html = file_get_html($url);if($html->find('img')){ foreach($html->find('img') as $element) { $raw = ranger($element->src); $im = @imagecreatefromstring($raw); $width = @imagesx($im); $height = @imagesy($im); if($width>=200||$height>=200){ echo $element;//得出长大于大于200，宽大于等于200的图片 } }}http://s.huffpost.com/images/v/logos/v4/tagline.gifhttp://s.huffpost.com/images/v/logos/v4/homepage.gif?v9http://i.huffpost.com/gen/559399/thumbs/r-OLBERMANN-huge.jpghttp://s.huffpost.com/images/facebook_promo_connect.png?3http://images.huffingtonpost.com/2012-04-04-michaeljfoxmarlo2SECOND.jpghttp://images.huffingtonpost.com/2012-04-05-Screenshot20120405at9.40.24AM.jpghttp://i.huffpost.com/gen/557914/thumbs/s-SCORSESE-large300.jpg
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我觉得，让客户端加载的方案是可行的，
客户端再将符合要求的图片信息提交给服务器，服务器端再验证一次后保存。。。
另外32768是怎么得来的？1-200不够吗
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学习！ 是用PHP获取图片url后直接读取图片的头信息吗？
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pinterest那个pin功能创意很好,而且技术很简单，就是书签一串js代码，然后你点这个书签就相当于往当前页面文档append入一个js文件，这个js文件怎么写，就很简单了，主要就是遍历document.getElementsByTagName('img')
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138个照片并发，是不是就消耗了138个连接数
对
是否需要修改php.ini，增加连接数
否，连接是向外的，如果要改，也是对方改
CPU和内存开销如何
这个不太好测试
又，关于使用 js 判断的问题，由于他们没有给出代码，无法测试
自己写了两个方案都不理想，也就作罢了
用JS并发和直接PHP并发，2者从资源消耗角度来比，哪个会更少
资源消耗角度来比 都一样，都要完整的加载图片
不过前者是消耗客户端资源，后者是消耗服务器端资源
另外浏览器的机制不很了解，是否真的是并发也未可知
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这段代码在我这里大约 1.8秒，不计算 file_get_html ( $url ) 时间
$res [] = $url ;//$temp;
这样就是网络地址了
他是保存为本地文件后用 getimagesize 获取尺寸的
他应该是通过 curl 并发的，这个机制我不太了解
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但是 if(in_array($absUrl, $visited))continue; 这行报错。 Warning: in_array() expects parameter 2 to be array, null。
他的代码中并没有你说的出错的代码
应该是 file_get_html 在报错吧
file_get_html 使用 file_get_contents 读取 url 成功率较低
经常要刷两三次才可独到数据
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JS可以通过获取图片的头部信息，而直接获取到图片的高度，
这种方式比用图片加载完成以后在获取他的搞定效率至少快10倍以上，
之前记得有在一个播客里面看到过这么个帖子来着，
没收藏，这一时半会的找不到了，郁闷啊~
[解决办法]
刚注册了http://pinterest.com。 它的做法就是用客户端来加载
点击Add 选择Pin ，贴上网址 http://www.huffingtonpost.com/
在chrome的Network中可以看到有一个请求
GET /pin/create/find_images/?url=http%253A%2F%2Fwww.huffingtonpost.com HTTP/1.1
返回的信息是一个json对象：
images: [http://s.huffpost.com/images/v/logos/v4/homepage.gif?v9,…]0: "http://s.huffpost.com/images/v/logos/v4/homepage.gif?v9"1: "http://s.huffpost.com/images/v/logos/v4/tagline.gif"2: "http://s.huffpost.com/images/splash/t_mini-a.png"3: "http://s.huffpost.com/images/splash/t_mini-a.png"4: "http://s.huffpost.com/images/splash/t_mini-a.png"5: "http://s.huffpost.com/images/splash/t_mini-a.png"6: "http://s.huffpost.com/images/splash/t_mini-a.png"7: "http://s.huffpost.com/images/splash/t_mini-a.png"8: "http://s.huffpost.com/images/splash/t_mini-a.png"9: "http://s.huffpost.com/images/splash/t_mini-a.png"10: "http://s.huffpost.com/images/splash/t_mini-a.png"11: "http://s.huffpost.com/images/splash/t_mini-a.png"12: "http://s.huffpost.com/images/splash/t_mini-a.png"13: "http://s.huffpost.com/images/splash/t_mini-a.png"14: "http://s.huffpost.com/images/splash/t_mini-a.png"15: "http://s.huffpost.com/images/splash/t_mini-a.png"16: "http://s.huffpost.com/images/splash/t_mini-a.png"17: "http://i.huffpost.com/gen/560770/thumbs/r-GSA-LAS-VEGAS-VIDEO-huge.jpg"18: "http://s.huffpost.com/images/webslice12x12.png"19: "http://s.huffpost.com/images/v/blog_column.png"20: "http://s.huffpost.com/contributors/gary-hart/headshot.jpg"21: "http://www.huffingtonpost.com/images/trans.gif"22: "http://www.huffingtonpost.com/images/trans.gif"23: "http://www.huffingtonpost.com/images/trans.gif"24: "http://images.huffingtonpost.com/2012-04-06-campbellguitar.jpg"25: "http://www.huffingtonpost.com/images/trans.gif"26: "http://www.huffingtonpost.com/images/trans.gif"27: "http://www.huffingtonpost.com/images/trans.gif"28: "http://www.huffingtonpost.com/images/trans.gif"29: "http://www.huffingtonpost.com/images/trans.gif"30: "http://www.huffingtonpost.com/images/trans.gif"31: "http://images.huffingtonpost.com/2012-04-06-Screenshot20120406at7.09.17PM.jpg"32: "http://www.huffingtonpost.com/images/trans.gif"33: "http://www.huffingtonpost.com/images/trans.gif"34: 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