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<div class="refnamediv">
<h1 class="refname">strip_tags</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">strip_tags</span> — <span class="dc-title">Strip HTML and PHP tags from a string</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.strip-tags-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>strip_tags</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$allowable_tags</code></span>
] )</div>
<p class="para rdfs-comment">
This function tries to return a string with all NULL bytes, HTML and PHP tags stripped
from a given <em><code class="parameter">str</code></em>. It uses the same tag stripping
state machine as the <span class="function"><a href="function.fgetss.html" class="function">fgetss()</a></span> function.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.strip-tags-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">str</code></em></span>
<dd>
<p class="para">
The input string.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">allowable_tags</code></em></span>
<dd>
<p class="para">
You can use the optional second parameter to specify tags which should
not be stripped.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
HTML comments and PHP tags are also stripped. This is hardcoded and
can not be changed with <em><code class="parameter">allowable_tags</code></em>.
</p>
</p></blockquote>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
This parameter should not contain whitespace.
<span class="function"><strong>strip_tags()</strong></span> sees a tag as a case-insensitive
string between <em><</em> and the first whitespace or
<em>></em>. It means that
<em>strip_tags("<br/>", "<br>")</em> returns an
empty string.
</p>
</p></blockquote>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.strip-tags-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the stripped string.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.strip-tags-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.0.0</td>
<td>
<span class="function"><strong>strip_tags()</strong></span> is now binary safe.
</td>
</tr>
<tr>
<td>4.3.0</td>
<td>
HTML comments are now always stripped.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.strip-tags-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-4886">
<p><strong>Example #1 <span class="function"><strong>strip_tags()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$text </span><span style="color: #007700">= </span><span style="color: #DD0000">'<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">strip_tags</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Allow <p> and <a><br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">strip_tags</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #DD0000">'<p><a>'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Test paragraph. Other text
<p>Test paragraph.</p> <a href="#fragment">Other text</a>
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 notes" id="refsect1-function.strip-tags-notes">
<h3 class="title">Notes</h3>
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">
Because <span class="function"><strong>strip_tags()</strong></span> does not actually validate the
HTML, partial or broken tags can result in the removal of more
text/data than expected.
</p>
</div>
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">
This function does not modify any attributes on the tags that you allow
using <em><code class="parameter">allowable_tags</code></em>, including the
<em>style</em> and <em>onmouseover</em> attributes
that a mischievous user may abuse when posting text that will be shown
to other users.
</p>
</div>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
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
<em><code class="parameter">allowable_tags</code></em> parameter.
</p>
</p></blockquote>
</div>
<div class="refsect1 seealso" id="refsect1-function.strip-tags-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.htmlspecialchars.html" class="function" rel="rdfs-seeAlso">htmlspecialchars()</a> - Convert special characters to HTML entities</span></li>
</ul>
</p>
</div>
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