Remove from string

Question

I have the following that I need removed from string in loop.

<comment>Some comment here</comment>

The result is from a database so the the content inside the comment tag is different.
Thanks for the help.

Figured it out. The following seems to do the trick.

echo preg_replace('~\<comment>.*?\</comment>~', '', $blog->comment);

So you want to remove the <comment> tags? Are there any other HTML tags in this string? — gen_Eric
– gen_Eric, Commented Jan 12, 2012 at 17:07
Seems like XML to me, so DOM & getELementsByTagName should work pretty much out of the box... — Wrikken
– Wrikken, Commented Jan 12, 2012 at 17:17
Thanks for the reply. Yes I would like to remove both the <comment> and the text inside it. — john tully
– john tully, Commented Jan 12, 2012 at 18:32

gen_Eric · Accepted Answer · 2012-01-12 19:59:19Z

1

This may be overkill, but you can use DOMDocument to parse the string as HTML, then remove the tags.

$str = 'Test 123 <comment>Some comment here</comment> abc 456';
$dom = new DOMDocument;
// Wrap $str in a div, so we can easily extract the HTML from the DOMDocument
@$dom->loadHTML("<div id='string'>$str</div>");  // It yells about <comment> not being valid
$comments = $dom->getElementsByTagName('comment');
foreach($comments as $c){
   $c->parentNode->removeChild($c);
}
$domXPath = new DOMXPath($dom);
// $dom->getElementById requires the HTML be valid, and it's not here
// $dom->saveHTML() adds a DOCTYPE and HTML tag, which we don't need
echo $domXPath->query('//div[@id="string"]')->item(0)->nodeValue; // "Test 123  abc 456"

DEMO: http://codepad.org/wfzsmpAW

edited Jan 12, 2012 at 19:59

answered Jan 12, 2012 at 19:53

gen_Eric

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Michael Berkowski · Accepted Answer · 2012-01-12 17:16:02Z

1

If this is only a matter of removing the <comment /> tag, a simple preg_replace() or a str_replace() will do:

$input = "<comment>Some comment here</comment>";

// Probably the best method str_replace()
echo str_replace(array("<comment>","</comment>"), "", $input);
// some comment here

// Or by regular expression...    
echo preg_replace("/<\/?comment>/", "", $input);
// some comment here

Or if there are other tags in there and you want to strip out all but a few, use strip_tags() with its optional second parameter to specify allowable tags.

echo strip_tags($input, "<a><p><other_allowed_tag>");

answered Jan 12, 2012 at 17:16

Michael Berkowski

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1 Comment

john tully Over a year ago

Thanks for the reply. I would like to remove the comment tags and also the text inside.

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