strip_tags
(PHP 4, PHP 5, PHP 7)
strip_tags — Strip HTML and PHP tags from a string
Description
$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>');
?>
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
$text = '<p>Test paragraph.</p><!-- Comment --> <a href="https://www.gaudry.be/en/php-rf-#fragment">Other text</a>';
echo strip_tags($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_tagsparameter.
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-strip-tags.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
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