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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.

> 注意: `allowable_tags` was added in PHP 3.0.13 and PHP 4.0.0.

> Since PHP 4.3.0, HTML comments are also stripped. This is hardcoded and can not be changed with `allowable_tags`.

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

警告
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.

例 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>'); ?>`

上例将输出：

    Test paragraph. Other text
    <p>Test paragraph.</p> <a href="#fragment">Other text</a>

strip_tags() has been binary safe since PHP 5.0.0

See also htmlspecialchars().

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