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public function getAvailableLetter(){
$params = $this -> getState('params');
if($params -> get('use_filter_first_letter',0)){
if($letters = $params -> get('tz_letters','a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z')){
$letters = explode(',',$letters);
$arr = null;
$filters = array();
if($catids = $params -> get('catid')){
$filters['catid'] = $catids;
}
if($featured = $this -> getState('filter.featured')){
$filters['featured'] = $featured;
}
if($tagId = $this -> getState('filter.tagId')){
$filters['tagId'] = $tagId;
}
if($userId = $this -> getState('filter.userId')){
$filters['userId'] = $userId;
}
if($year = $this -> getState('filter.year')){
$filters['year'] = $year;
}
if($month = $this -> getState('filter.month')){
$filters['month'] = $month;
}
$lettersArt = TZ_Portfolio_PlusContentHelper::getLetters($filters);
foreach($letters as $i => &$letter){
$letter = trim($letter);
$letterKey = ord($letter);
$arr[$i] = false;
if(in_array($letterKey, $lettersArt)){
$arr[$i] = true;
}
}
return $arr;
}
}
return false;
if(in_array($letterKey, $lettersArt)){
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