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<h1 class="refname">exif_imagetype</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">exif_imagetype</span> — <span class="dc-title">Determine the type of an image</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.exif-imagetype-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>exif_imagetype</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>exif_imagetype()</strong></span> reads the first bytes of an image and
checks its signature.
</p>
<p class="para">
<span class="function"><strong>exif_imagetype()</strong></span> can be used to avoid calls to other
<a href="ref.exif.html" class="link">exif</a> functions with unsupported file types
or in conjunction with <var class="varname"><var class="varname"><a href="reserved.variables.server.html" class="classname">$_SERVER['HTTP_ACCEPT']</a></var></var> to check
whether or not the viewer is able to see a specific image in the browser.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.exif-imagetype-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">filename</code></em></span>
<dd>
<span class="simpara">
The image being checked.
</span>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.exif-imagetype-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
When a correct signature is found, the appropriate constant value will be
returned otherwise the return value is <strong><code>FALSE</code></strong>. The return value is the
same value that <span class="function"><a href="function.getimagesize.html" class="function">getimagesize()</a></span> returns in index 2 but
<span class="function"><strong>exif_imagetype()</strong></span> is much faster.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
<span class="function"><strong>exif_imagetype()</strong></span> will emit an <strong><code>E_NOTICE</code></strong>
and return <strong><code>FALSE</code></strong> if it is unable to read enough bytes from the file to
determine the image type.
</p>
</p></blockquote>
</div>
<div class="refsect1 changelog" id="refsect1-function.exif-imagetype-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>5.3.0</td>
<td>
Added icon support.
</td>
</tr>
<tr>
<td>4.3.2</td>
<td>
Support for <acronym title="Japan Picture">JPC</acronym>, <acronym title="JPEG-2000">JP2</acronym>,
<acronym>JPX</acronym>, <acronym title="Joint Bilevel Image Experts Group">JB2</acronym>,
<acronym title="X Bitmap">XBM</acronym>, and <acronym title="Wireless Bitmap">WBMP</acronym>
</td>
</tr>
<tr>
<td>4.3.0</td>
<td>Support for <acronym>SWC</acronym></td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 constants" id="refsect1-function.exif-imagetype-constants">
<h3 class="title">Predefined Constants</h3>
<p class="para">
The following constants are defined, and represent possible
<span class="function"><strong>exif_imagetype()</strong></span> return values:
<table class="doctable table">
<caption><strong>Imagetype Constants</strong></caption>
<thead>
<tr>
<th>Value</th>
<th>Constant</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>1</td>
<td><strong><code>IMAGETYPE_GIF</code></strong></td>
</tr>
<tr>
<td>2</td>
<td><strong><code>IMAGETYPE_JPEG</code></strong></td>
</tr>
<tr>
<td>3</td>
<td><strong><code>IMAGETYPE_PNG</code></strong></td>
</tr>
<tr>
<td>4</td>
<td><strong><code>IMAGETYPE_SWF</code></strong></td>
</tr>
<tr>
<td>5</td>
<td><strong><code>IMAGETYPE_PSD</code></strong></td>
</tr>
<tr>
<td>6</td>
<td><strong><code>IMAGETYPE_BMP</code></strong></td>
</tr>
<tr>
<td>7</td>
<td><strong><code>IMAGETYPE_TIFF_II</code></strong> (intel byte order)</td>
</tr>
<tr>
<td>8</td>
<td>
<strong><code>IMAGETYPE_TIFF_MM</code></strong> (motorola byte order)
</td>
</tr>
<tr>
<td>9</td>
<td><strong><code>IMAGETYPE_JPC</code></strong></td>
</tr>
<tr>
<td>10</td>
<td><strong><code>IMAGETYPE_JP2</code></strong></td>
</tr>
<tr>
<td>11</td>
<td><strong><code>IMAGETYPE_JPX</code></strong></td>
</tr>
<tr>
<td>12</td>
<td><strong><code>IMAGETYPE_JB2</code></strong></td>
</tr>
<tr>
<td>13</td>
<td><strong><code>IMAGETYPE_SWC</code></strong></td>
</tr>
<tr>
<td>14</td>
<td><strong><code>IMAGETYPE_IFF</code></strong></td>
</tr>
<tr>
<td>15</td>
<td><strong><code>IMAGETYPE_WBMP</code></strong></td>
</tr>
<tr>
<td>16</td>
<td><strong><code>IMAGETYPE_XBM</code></strong></td>
</tr>
<tr>
<td>17</td>
<td><strong><code>IMAGETYPE_ICO</code></strong></td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.exif-imagetype-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3162">
<p><strong>Example #1 <span class="function"><strong>exif_imagetype()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">exif_imagetype</span><span style="color: #007700">(</span><span style="color: #DD0000">'image.gif'</span><span style="color: #007700">) != </span><span style="color: #0000BB">IMAGETYPE_GIF</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'The picture is not a gif'</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.exif-imagetype-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.image-type-to-mime-type.html" class="function" rel="rdfs-seeAlso">image_type_to_mime_type()</a> - Get Mime-Type for image-type returned by getimagesize,
exif_read_data, exif_thumbnail, exif_imagetype</span></li>
<li class="member"> <span class="function"><a href="function.getimagesize.html" class="function" rel="rdfs-seeAlso">getimagesize()</a> - Get the size of an image</span></li>
</ul>
</p>
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