(PHP 4, PHP 5)
strip_tags — Strip HTML and PHP tags from a 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.
  
strThe input string.
allowable_tagsYou 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
str. For example, to allow both <br> and <br/>, you should use:<?php
strip_tags($input, '<br>');
?>
Returns the stripped string.
| Version | Description | 
|---|---|
| 5.3.4 | strip_tags() ignores self-closing XHTML
        tags in allowable_tags. | 
| 5.0.0 | strip_tags() is now binary safe. | 
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>
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.