add_shortcode("agt", "agt_shortcode");  
function agt_shortcode( $atts, $content = null ) {  
    return $content;  
} 
function fasttruncate($string, $length = 80, $etc = '',$break_words = false, $middle = false)
{
    if ($length == 0){
        return '';
    }
    if (strlen($string) > $length) {
        $length -= min($length, strlen($etc));
        if (!$break_words && !$middle) {
            $string = preg_replace('/\s+?(\S+)?$/', '', substr($string, 0, $length+1));
        }
        if(!$middle) {
            return substr($string, 0, $length) . $etc;
        } else {
            return substr($string, 0, $length/2) . $etc . substr($string, -$length/2);
        }
    } else {
        return $string;
    }
}
function tr_ucwords($deger) {
    $lower_arr = array("I"=>"ı","i"=>"İ");
    $deger = strtr($deger,$lower_arr);
    $deger = mb_convert_case($deger, MB_CASE_TITLE, "UTF-8");
    return $deger;
}
add_filter( 'wp_insert_post_data' , 'auto_generate_title' , '99', 2 );
function auto_generate_title( $data , $postarr ) 
{
    $kackarakter = 30;
    $ortalama1kelimekackarakter = 8;
    $title_of_post = ltrim($data['post_title']);
    $length_of_title = strlen($title_of_post);
    $postdata = ltrim($data['post_content']);
    if($length_of_title<1)
    {
        $matchPattern = "/\[agt\](.*?)\[\/agt\]/";
        preg_match_all($matchPattern, $postdata, $foundIt, PREG_PATTERN_ORDER);
        if (isset($foundIt[1][0])){
            $data['post_title'] =  $foundIt[1][0];
        }else{
            $metin = str_replace('.  ','.',$postdata);
            $metin = str_replace('. ','.',$metin);
            $metin = str_replace('.','. ',$metin);
            $sadecemetin = preg_replace("@[^a-z0-9\-_şıüğçöÖİŞĞÜÇ ]+@i","",$metin);
            $totalkarakter = @strlen($sadecemetin);
            $kelimebul = explode(' ', $sadecemetin);
            $totalkelime = @count($kelimebul);
            $kavg = ceil($kackarakter+3/$ortalama1kelimekackarakter);
            $maxrand = ($totalkelime - $kavg) - 1;
            $start = rand(0,$maxrand);
            $yenibaslik = array();
            for ($i=$start; $i <= ($start+($kavg)); $i++) { 
                $yenibaslik[] = $kelimebul[$i];
            }
            $yenibaslik = @implode(' ', $yenibaslik);
            $yenibaslik = trim(fasttruncate($yenibaslik,$kackarakter));
            $yenibaslik = tr_ucwords($yenibaslik); /* her kelimenin ilk karakterini büyük karakter yapar. */
            $data['post_title'] = $yenibaslik;
        }
    }
    return $data;
}