如何在PHP中使用preg添加html属性 [英] How to use preg in php to add html properties

问题描述

我正在寻找一个用php编写的脚本，该脚本可以扫描html文档，并根据发现的内容向元素添加新的标记.更具体地说，我要扫描文档，并针对每个元素搜索CSS标记"float:right/left"，如果找到它，则会添加align ="right/left"(基于找到的内容). 示例:

I'm looking to write a script in php that scans an html document and adds new markup to a element based on what it finds. More specifically, I was it to scan the document and for every element it searches for the CSS markup "float: right/left" and if it locates it, it adds align="right/left" (based on what it finds). Example:

<img alt="steve" src="../this/that" style="height: 12px; width: 14px; float: right"/>

成为

<img alt="steve" src="../this/that" align="right" style="height: 12px; width: 14px; float: right"/>

推荐答案

 $dom = new DOMDocument();
 $dom->loadHTML($htmlstring);
 $x = new DOMXPath($dom);
 foreach($x->query("//img[contains(@style,'float: right']") as $node) $node->setAttribute('align','right');
 foreach($x->query("//img[contains(@style,'float: left']") as $node) $node->setAttribute('align','left');

当"float:"和"正确"，有几种选择:

When there is no certainty of amount of space between 'float:' & 'right', there are several options:

1. 使用XPath 1.0://img[starts-with(normalize-space(substring-after(@style,'float:')),'right')]
2. 只需对//img[contains(@style,'float:']这样的浮点数进行简单检查，然后使用$node->getAttribute()检查之后的实际情况.
3. 将preg_match导入到equasion中(刚刚向我指出(感谢Gordon)，但是在这种情况下，imho是最不受欢迎的解决方案):

1. Use the XPath 1.0: //img[starts-with(normalize-space(substring-after(@style,'float:')),'right')]
2. Just do a simple check for float like //img[contains(@style,'float:'], and check with $node->getAttribute() what actually comes afterwards.
3. Import preg_match into the equasion (which was just recently pointed out to me (thanks Gordon), but in this case is imho the least favorite solution):

.

 $dom = new DOMDocument();
 $dom->loadHTML($htmlstring);
 $x = new DOMXPath($dom);
 $x->registerNamespace("php", "http://php.net/xpath");
 $x->registerPHPFunctions('preg_match');

 foreach($x->query("//img[php:functionString('preg_match','/float\s*:\s*right/',@style)]") as $node) $node->setAttribute('align','right');

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