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PHP Functions Online


(PHP 4, PHP 5)

strip_tagsStrip HTML and PHP tags from a string

string strip_tags(string $str[, string $allowable_tags])

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Preview #

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Description #

string strip_tags ( string $str [, string $allowable_tags ] )

This function tries to return a string with all NULL bytes, HTML and PHP tags stripped from a given str. It uses the same tag stripping state machine as the fgetss() function.

Parameters #


The input string.


You can use the optional second parameter to specify tags which should not be stripped.


HTML comments and PHP tags are also stripped. This is hardcoded and can not be changed with allowable_tags.


This parameter should not contain whitespace. strip_tags() sees a tag as a case-insensitive string between < and the first whitespace or >. It means that strip_tags("<br/>", "<br>") returns an empty string.

Return Values #

Returns the stripped string.

Examples #

Example #1 strip_tags() example

'<p>Test paragraph.</p><!-- Comment --> <a href="">Other text</a>';

// Allow <p> and <a>
echo strip_tags($text'<p><a>');

The above example will output:

Test paragraph. Other text
<p>Test paragraph.</p> <a href="#fragment">Other text</a>

Changelog #

Version Description
5.0.0 strip_tags() is now binary safe.
4.3.0 HTML comments are now always stripped.

Notes #


Because strip_tags() does not actually validate the HTML, partial or broken tags can result in the removal of more text/data than expected.


This function does not modify any attributes on the tags that you allow using allowable_tags, including the style and onmouseover attributes that a mischievous user may abuse when posting text that will be shown to other users.


Tag names within the input HTML that are greater than 1023 bytes in length will be treated as though they are invalid, regardless of the allowable_tags parameter.

See Also #