正则表达式HTML操作

Question

是什么，才能有以下结果正则表达式的表达式，内任何 HTML TD任何形象？

来自：

<td width="7" height="50" nowrap> 
<img src="/images/img_1.png" width="7" height="50" alt="" /> 
</td> 

到：

<td width="7" height="50" nowrap background="/images/img_1.png"></td> 

Answer 1

这是不好的做法，使用正则表达式来解析HTML。相反，使用PHP中提供的专门用于解析HTML的工具，即DomDocument [doc]。

// create a new DomDocument object 
$doc = new DOMDocument(); 

// load the HTML into the DomDocument object (this would be your source HTML) 
$doc->loadHTML(' 
    <table> 
     <tr> 
      <td width="7" height="50" nowrap> 
       <img src="/images/img_1.png" width="7" height="50" alt="" /> 
      </td> 
     </tr> 
    </table> 
'); 

//Loop through each <td> tag in the dom 
foreach($doc->getElementsByTagName('td') as $cell) { 
    // grab any images in this cell 
    $images = $cell->getElementsByTagName('img'); 
    if ($images->length >= 1) { // if an image is found 
     $image = $images->item(0); 
     // add the 'background' property to the cell, use the 'src' property 
     $cell->setAttribute('background', $image->getAttribute('src')); 
     // remove the image 
     $cell->removeChild($image); 
    } 
} 
echo $doc->saveHTML(); 

看到它在行动：http://codepad.viper-7.com/x9ooyp

文档

• DomDocument - http://php.net/manual/en/class.domdocument.php
• DomElement - http://www.php.net/manual/en/class.domelement.php
• DomElement::getAttribute - http://www.php.net/manual/en/domelement.getattribute.php
• DOMElement::setAttribute - http://www.php.net/manual/en/domelement.setattribute.php
• DomDocument::loadHTMLFile - [！小马他来] http://www.php.net/manual/en/domdocument.loadhtmlfile.php