问题
I use DOMxpath to remove html tags that have empty text node but to keep <br/>
tags,
$xpath = new DOMXPath($dom);
while(($nodeList = $xpath->query('//*[not(text()) and not(node()) and not(self::br)]')) && $nodeList->length > 0)
{
foreach ($nodeList as $node)
{
$node->parentNode->removeChild($node);
}
}
it works perfectly until I came across another problem,
$content = '<p><br/><br/><br/><br/></p>';
How do remove this kind of messy <br/>
and<p>
? which means I don't want to allow <br/>
alone with <p>
but I allow <br/>
with proper text like this only,
$content = '<p>first break <br/> second break <br/> the last line</p>';
Is that possible?
Or is it better with a regular expression?
I tried something like this,
$nodeList = $xpath->query("//p[text()=<br\s*\/?>\s*]");
foreach($nodeList as $node)
{
$node->parentNode->removeChild($node);
}
but it return this error,
Warning: DOMXPath::query() [domxpath.query]: Invalid expression in...
回答1:
You can select the unwanted p using XPath:
"//p[count(*)=count(br) and br and normalize-space(.)='']"
Note to select empty-text nodes shouldn't you better use (?):
"//*[normalize-space(.)='' and not(self::br)]"
This will select any element (but br) whithout text nodes, nodes like:
<p><b/><i/></p>
or
<p> <br/> <br/>
</p>
included.
回答2:
I have almost same situation, i use:
$document->loadHTML(str_replace('<br>', urlencode('<br>'), $string_or_file));
And use urlencode()
to change it back for display or inserting to database.
Its work for me.
回答3:
You could get rid of them all by simply checking to see that the only things within a paragraph are spaces and <br />
tags: preg_replace("\<p\>(\s|\<br\s*\/\>)*\<\/p\>","",$content);
Broken down:
\<p\> # Match for <p>
( # Beginning of a group
\s # Match a space character
| # or...
\<br\s*\/\> # match a <br /> tag, with any number (including 0) spaces between the <br and />
)* # Match this whole group (spaces or <br /> tags) 0 or more times.
\<\/p\> # Match for </p>
I will mention, however, that unless your HTML is well-formatted (one-line, no strange spaces or paragraph classes, etc), you should not use regex to parse this. If it is, this regex should work just fine.
来源:https://stackoverflow.com/questions/6837892/remove-pbr-p-with-domxpath-or-regex