05-10-2012
Remove all HTML, scripts and styles?
Hi all,
How might I go about writing a program that will read all input as an HTML file, and subsequently strip all HTML, embedded scripts and style sheets from its input, leaving only text as the output?
I am a beginner, so the simpler, the better.
Thanks for any advice
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LEARN ABOUT PHP
strip_tags
STRIP_TAGS(3) 1 STRIP_TAGS(3)
strip_tags - Strip HTML and PHP tags from a string
SYNOPSIS
string strip_tags (string $str, [string $allowable_tags])
DESCRIPTION
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(3) function.
PARAMETERS
o $str
- The input string.
o $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
This parameter should not contain whitespace. strip_tags(3) sees a tag as a case-insensitive string between < and the first
whitespace or >.
Note
In PHP 5.3.4 and later, you will also need to include the self-closing XHTML tag to strip these from $str. For example, to
strip both <br> and <br/>, you should use:
<?php
strip_tags($input, '<br><br/>');
?>
RETURN VALUES
Returns the stripped string.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.4 | |
| | |
| | strip_tags(3) no longer strips self-closing XHTML |
| | tags unless the self-closing XHTML tag is also |
| | given in $allowable_tags. |
| | |
| 5.0.0 | |
| | |
| | strip_tags(3) is now binary safe. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
strip_tags(3) example
<?php
$text = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>';
echo strip_tags($text);
echo "
";
// 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
Warning
Because strip_tags(3) does not actually validate the HTML, partial or broken tags can result in the removal of more text/data than
expected.
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.
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(3).
PHP Documentation Group STRIP_TAGS(3)