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字符匹配的问题

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Jun 23, 2016 pm 02:16 PM

请问怎么在一堆源码中匹配以下字符
img id="main-image" src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"

我主要是想获取到图片的地址，其中41Auzc7RBPL._SY300_(图片的文件名称是随机产生的，每次都不一样的)，
请问怎么获取到http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg

回复讨论(解决方案)

用正则处理最方便:

$str = '请问怎么在一堆源码中匹配以下字符img id="main-image" src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"';$p = '#img\s*id="main-image"\s*src="(http://ecx\.images-mazon\.com/images/I/.+\.(jpg|gif|jpeg|png))"#U';preg_match($p, $str, $result) && var_dump($result);

根据情况也可以解析为DOM：

$html = '<div><img  src="/static/imghwm/default1.png"  data-src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"  class="lazy"  id="main-image"  / alt="字符匹配的问题" ></div>';$doc = new DOMDocument();$doc->loadHTML($html);echo $doc->getElementById('main-image')->getAttribute('src');

经循环100000次测试，后者的速度是前者正则的7倍,而且随着测试源字符串的体积增大，差距将可能更大

41Auzc7RBPL._SY300_这个字符串是随机产生的，每次都不样，后面那个DOM直接用了这个字符串了，而文件名是不知道的

$str='img id="main-image" src="http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"';$p = |img id="main-image" src="(.*)"|iUs;preg_match($p, $str, $result);print_r($result);//如果你只需要对获取到的网址里那个图片名称那么你需要分割$ep=explode('/',$result[0]);echo $ep[5];

学习一下，我就会正则来处理，二楼果断高手

preg_match正则取就好了~实在不会字符串分割都可以的吧

学习一下 PHP解析DOM 之前没注意到这个方法

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