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

<?xml version="1.0" encoding="iso-8859-1"?>
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<reference id="ref.exif">
 <title>Exif Functions</title>
 <titleabbrev>Exif</titleabbrev>

 <partintro>
   <section id="exif.intro">
    &reftitle.intro;
    <para>
     With the exif extension you are able to work with image meta data.  For
     example, you may use exif functions to read meta data of pictures taken 
     from digital cameras by working with information stored in the headers of 
     the <acronym>JPEG</acronym> and <acronym>TIFF</acronym> images.
    </para>
   </section>

   <section id="exif.requirements">
    &reftitle.required;
    <para>
     Your PHP must be compiled in with <literal>--enable-exif</literal>.  
     PHP does not require any additional library for the exif module. Windows
     users must also have the <link linkend="ref.mbstring"> mbstring</link>
     extension enabled.
    </para>
   </section>

   &reference.exif.configure;

   &reference.exif.ini;

   <section id="exif.resources">
    &reftitle.resources;
    &no.resource;
   </section>

   &reference.exif.constants;

 </partintro>

 &reference.exif.functions;

 </reference>
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