php script not running to finish point

[narutofan]

Hi,

i'm currently facing a problem of php script not running to the finish point of the script. the code actually tries to find tags preceded either with  "!" or "@" and if it doesn't match it outputs user input data in to a update query at the end and this is where the script isn't behaving properly it tries to match the tags but it is not updating in to DB i don't know where i'm going wrong.The code might be long but that is all there is to it.

include_once '../includes/dbconfig.inc.php';
if(strlen(htmlentities($_POST['data']))<1){
    echo "Data empty!";
    exit();
}


#clean all the post vars that will interact with the DB.
#ideal for search results page
$u_id=(int)$_POST['id'];
$type=htmlentities($_POST['type']);
$account_name= htmlentities($_SESSION['uname']);
$data= htmlentities($_POST['data']);
$tit= htmlentities($_POST['title']);
$sess_id=(int)$_SESSION['id'];
$title=  stripslashes($tit);

$sql="select count(user_id) from user where uname=:account_name and activated='1' limit 1";
$stmth=$conn->prepare($sql);
$stmth->bindparam(":account_name",$account_name);
$stmth->execute();
$row=$stmth->rowCount();
                    if ($row<1) {
                        echo "Account doesn't exist";
                        exit();
                        }
                        $dat=  explode(" ", $data);//names are exploded in to array 
                       $data1="";          
                 foreach($dat as $d){
                    if(strpos($d ,'!') !== FALSE ){
                 $d_p=""; 
            $i=0;
            $tag="";
                     $d2=count($dat);
                     while ($i<$d2) {
                      
                         $d_w=$dat[$i];
                  
                            $regex="/!+([a-zA-z0-9._-]+)/";
                            $regex1="/(?:\s|^)![A-Za-z0-9\-\.\_]+(?:\s|$)/";
                    $d1=preg_match_all($regex, $dat[$i],$output_preg,PREG_PATTERN_ORDER);
                  
                        
                       function check_regex($data){
                           if ($data=="/(?:\s|^)![A-Za-z0-9\-\.\_]+(?:\s|$)/")
                           {
                               return $data;
                           }
                           
                           }
                   
                     $i++;
                       $d_p= array_column($dat,$output_preg[0][0],$regex1);
                       
                       $d_f= preg_grep($regex1, $d_p);
                   $d_c= array_count_values($d_f);
                   //print_r($d_c);
                   foreach ($d_c as $d2) {
                     
                       if ($d2>=2) {
                          $tag=1;
                           
                       } 
                   }
                  
                     }
                    
                     if($tag==1){
                        echo 1;
                        exit();
                    } else {
                        echo 0;
                    }
                     
                   
                     }
                                  
                  elseif (strpos($d ,'@') !== FALSE) {
                         $d1=str_replace("@", "", $d);
                         
                         //check if the user exists
                     $stmt=  $conn->prepare("select count(uname) from user where uname=:d1 and activated='1'");
                     $stmt->bindValue(":d1",$d1);
                     $stmt->execute();
                   
                     $count=$stmt->rowCount();
                   
                     if($count>0){
                         $data1=str_replace("@$d1", "<a href='home.php?u={$d1}'>@$d1</a>", $data);
                        
                                          $app = "Status post";
		$note = $_SESSION['uname'].' Mentioned you in a Post: <br /><a href="home.php?u='.$_SESSION['uname'].'">'.$_SESSION['uname'].'&#39;s Profile</a><br><hr>';
                $stmth=  $conn->prepare("insert into notifications (username, initiator, app, note, date_time,user_id_n) values(:friend,:session,:app,:note,now(),:sess_id)");
                    $stmth->bindparam(":friend",$d1);
                    $stmth->bindparam(":session",$_SESSION['uname']);
                    $stmth->bindparam(":sess_id",$sess_id);
                    $stmth->bindparam(":app",$app);
                    $stmth->bindparam(":note",$note);
                    $stmth->execute();                           
                 }
                 
                     }
 else {
    $data1=$data;
} 

                     }
                    
    #insert in to DB
    try { 
        $stmt=$conn->prepare("update updates set account_name=:account_name,author=:session, title=:title ,update_body=:data1,time=now() where update_id=:u_id");
            $stmt->bindparam(":account_name",$account_name);
            $stmt->bindparam(":session",$account_name);
            $stmt->bindparam(":title",$title);
            $stmt->bindparam(":data1",$data1);
             $stmt->bindparam(":u_id",$u_id);
            $stmt->execute();
        
            }catch (PDOException $ex) {
        echo $ex->getMessage();
}
            echo 2;

 

[narutofan]

and it is not catching any error at the end

[narutofan]

finally found the solution i deleted the check_regex function i intended it for array_filter function and now it works fine thanks for your patience all.