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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
</p>
<p class="para">
<dl>
<dt id="constant.exif-use-mbstring">
<strong><code>EXIF_USE_MBSTRING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
This constant have a value of <em>1</em> if the
<a href="ref.mbstring.html" class="link">mbstring</a> is enabled, otherwise
the value is <em>0</em>.
</span>
</dd>
</dl>
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<p class="para">
The <span class="function"><a href="function.exif-imagetype.html" class="function">exif_imagetype()</a></span> lists several related built-in
constants.
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