strip_tags
strip_tags
(PHP 4, PHP 5, PHP 7)
strip_tags — Strip HTML and PHP tags from a string
Description
string strip_tags ( string $str [, string $allowable_tags ] )
This function tries to return a string with all NULL bytes, HTML and PHP tags stripped from a given str
. It uses the same tag stripping state machine as the fgetss() function.
Parameters
-
str
-
The input string.
-
allowable_tags
-
You can use the optional second parameter to specify tags which should not be stripped.
Note:
HTML comments and PHP tags are also stripped. This is hardcoded and can not be changed with
allowable_tags
.Note:
In PHP 5.3.4 and later, self-closing XHTML tags are ignored and only non-self-closing tags should be used in
allowable_tags
. For example, to allow both <br> and <br/>, you should use:<?php strip_tags($input, '<br>'); ?>
Return Values
Returns the stripped string.
Changelog
Version | Description |
---|---|
5.3.4 | strip_tags() ignores self-closing XHTML tags in allowable_tags . |
5.0.0 | strip_tags() is now binary safe. |
Examples
Example #1 strip_tags() example
<?php $text = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>'; echo strip_tags($text); echo "\n"; // 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>
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.
Note:
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
- htmlspecialchars() - Convert special characters to HTML entities
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.strip-tags.php