php 在字符串中查找 HTML 标签
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/18800807/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Finding HTML tags in string
提问by Sven van Zoelen
I know this question is around SO, but I can't find the right one and I still suck in Regex :/
我知道这个问题是关于 SO 的，但是我找不到合适的问题，而且我仍然在使用正则表达式：/
I have an stringand that string is valid HTML. Now I want to find all the tags with an certain nameand attribute.
我有一个string，该字符串是有效的 HTML。现在我想找到所有带有某个name和的标签attribute。
I tried this regex (i.e. div with type): /(<div type="my_special_type" src="(.*?)<\/div>)/.
我想这正则表达式（即格型）/(<div type="my_special_type" src="(.*?)<\/div>)/。
Example string:
示例字符串：
<div>Do not match me</div>
<div type="special_type" src="bla"> match me</div>
<a>not me</a>
<div src="blaw" type="special_type" > match me too</div>
If I use preg_match then I only get <div type="special_type" src="bla"> match me</div>what is logical because the other one has the attributes in a different order.
如果我使用 preg_match 那么我只会得到<div type="special_type" src="bla"> match me</div>合乎逻辑的东西，因为另一个具有不同顺序的属性。
What regex do I need to get the following arraywhen using preg_matchon the example string?:
在示例字符串上array使用时，我需要什么正则表达式来获得以下内容preg_match？：
array(0 => '<div type="special_type" src="bla"> match me</div>',
1 => '<div src="blaw" type="special_type" > match me too</div>')
回答by hek2mgl
A general advice: Dont use regex to parse HTMLIt will get messy if the HTML changes..
一般建议：不要使用正则表达式来解析 HTML如果 HTML 更改，它会变得混乱..
Use DOMDocumentinstead:
使用DOMDocument来代替：
$str = <<<EOF
<div>Do not match me</div>
<div type="special_type" src="bla"> match me</div>
<a>not me</a>
<div src="blaw" type="special_type" > match me too</div>
EOF;
$doc = new DOMDocument();
$doc->loadHTML($str);
$selector = new DOMXPath($doc);
$result = $selector->query('//div[@type="special_type"]');
// loop through all found items
foreach($result as $node) {
echo $node->getAttribute('src');
}
回答by Kilise
As hek2msql said, you better use DOMDocument
正如 hek2msql 所说，你最好使用 DOMDocument
$html = '
<div>Do not match me</div>
<div type="special_type" src="bla"> match me</div>
<a>not me</a>
<div src="blaw" type="special_type" > match me too</div>';
$matches = get_matched($html);
function get_matched($html){
$matched = array();
$dom = new DOMDocument();
@$dom->loadHtml($html);
$length = $dom->getElementsByTagName('div')->length;
for($i=0;$i<$length;$i++){
$type = $dom->getElementsByTagName("div")->item($i)->getAttribute("type");
if($type != 'special_type')
continue;
$matched[] = $dom->getElementsByTagName("div")->item($i)->getAttribute('src');
// or $matched[] = $dom->getElementsByTagName("div")->item($i)->nodeValue;
}
return $matched;
}
