用PHP获取img src [英] Get img src with PHP

问题描述

 < img border =0我想在这个例子中将SRC属性变成一个变量： src =/ images / image.jpgalt =Imagewidth =100height =100/> 
  

例如 - 我想获得一个变量 $ foo = /images/image.jpg。
重要！ src属性将是动态的，所以它不能被硬编码。
有没有什么快捷的方法可以做到这一点？

谢谢！

编辑：The图像将成为一个巨大的字符串的一部分，基本上是新闻报道的内容。所以图像只是其中的一部分。

编辑2：这个字符串中会有更多的图像，我只想得到第一个图像的src。这可能吗？

解决方案

使用HTML解析器，如 DOMDocument ，然后使用 DOMXpath 评估您要查找的值：

  $ html ='< img id =12border =0src =/ images / image.jpg
 alt =Imagewidth =100height =100/>'; 
 
 $ doc = new DOMDocument（）; 
 $ doc-> loadHTML（$ html）; 
 $ xpath = new DOMXPath（$ doc）; 
 $ src = $ xpath-> evaluate（string（// img / @ src））; ＃/images/image.jpg
  

或者对于那些真正需要节省空间的人：

  $ xpath = new DOMXPath（@DOMDocument :: loadHTML（$ html））; 
 $ src = $ xpath-> evaluate（string（// img / @ src））; 
  

对于单线队员来说：

  $ src =（string）reset（simplexml_import_dom（DOMDocument :: loadHTML（$ html）） - > xpath（// img / @ src））; 
  

I would like to get the SRC attribute into a variable in this example:

<img border="0" src="/images/image.jpg" alt="Image" width="100" height="100" />

So for example - I would like to get a variable $foo = "/images/image.jpg". Important! The src attribute will be dynamic, so it mustn't be hardcoded. Is there any quick and easy way to do this?

Thanks!

EDIT: The image will be a part of a huge string that is basically the content of a news story. So the image is just a part of that.

EDIT2: There will be more images in this string, and I would only want to get the src of the first one. Is this possible?

解决方案

Use a HTML parser like DOMDocument and then evaluate the value you're looking for with DOMXpath:

$html = '<img id="12" border="0" src="/images/image.jpg"
         alt="Image" width="100" height="100" />';

$doc = new DOMDocument();
$doc->loadHTML($html);
$xpath = new DOMXPath($doc);
$src = $xpath->evaluate("string(//img/@src)"); # "/images/image.jpg"

Or for those who really need to save space:

$xpath = new DOMXPath(@DOMDocument::loadHTML($html));
$src = $xpath->evaluate("string(//img/@src)");

And for the one-liners out there:

$src = (string) reset(simplexml_import_dom(DOMDocument::loadHTML($html))->xpath("//img/@src"));

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