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PHP Manual

strip_tags

(PHP 3>= 3.0.8, PHP 4 )

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 HTML and PHP tags stripped from a given str. It uses the same tag stripping state machine as the fgetss() function.

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

Note: allowable_tags was added in PHP 3.0.13 and PHP 4.0b3. Since PHP 4.3.0, HTML comments are also stripped.

Warning

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

Example 1. strip_tags() example

 <?php
$text = '
<p>Test paragraph.</p>
<!-- Comment -->
Other text';

echo strip_tags($text);

echo "\n\n-------\n";

// allow <p>
echo strip_tags($text, '<p>');
?>

The above example will output:

Test paragraph.  Other text  -------  <p>Test paragraph.</p>  Other text

Warning

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.