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# strip_tags

(PHP 3>= 3.0.8, PHP 4 , PHP 5)

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.

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

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

示範 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

切記!
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.

strip_tags() has been binary safe since PHP 5.0.0

See also htmlspecialchars().

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