php-doc-en/reference/exif/constants.xml

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<appendix xml:id="exif.constants" xmlns="http://docbook.org/ns/docbook">
 &reftitle.constants;
 &extension.constants;
 <para>
  <variablelist>
   <varlistentry xml:id="constant.exif-use-mbstring">
    <term>
     <constant>EXIF_USE_MBSTRING</constant> 
     (<type>int</type>)
    </term>
    <listitem>
     <simpara>
      This constant has a value of <literal>1</literal> if the
      <link linkend="ref.mbstring">mbstring</link> is enabled, otherwise
      it has a value of <literal>0</literal>.
     </simpara>
    </listitem>
   </varlistentry>
  </variablelist>
 </para>
 <para>
  The <function>exif_imagetype</function> lists several related built-in
  constants.
 </para>
</appendix>
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