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# Required attributes 

$attr_gn       = 'urn:mace:dir:attribute-def:givenName';
$attr_sn       = 'urn:mace:dir:attribute-def:sn';
$attr_mail     = 'urn:mace:dir:attribute-def:mail';

# attributes to let through (ARP)
$requiredAttributes = array(
  'FirstName',
  'LastName',
  'Email'
);

if (isset($attributes) and ($attributes !== FALSE)) {
    if (!empty($attributes[$attr_mail][0])) {
        $subjectId = $attributes[$attr_mail][0];
    }
    if (!empty($attributes[$attr_gn])) {
        $attributes['FirstName'] = $attributes[$attr_gn];
    }
    if (!empty($attributes[$attr_sn])) {
        $attributes['LastName'] = $attributes[$attr_sn];
    }
    if (!empty($attributes[$attr_mail])) {
        $attributes['Email'] = $attributes[$attr_mail];
    }
}

# Remove all other attributes
foreach ($attributes as $k => $v) {
  if (!in_array($k, $requiredAttributes)) {
    unset($attributes[$k]);
  }
}