When reading EXIF information from the 'WINXP' group, you may need to change used encoding from the default "ISO-8859-15" to "UTF-8". This can be done in php.ini or in your code:
<?php
ini_set('exif.encode_unicode', 'UTF-8');
$exif = exif_read_data('TEST.JPG', 0, true);
echo $exif['WINXP']['Title'];
?>
Useful documentation about EXIF:
http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
See also comments next to XPTitle and XPAuthor.