PHP Reforce Search Engine

I have this Search option, where it looks for the Title and the Category Referent to the variable requested by the FORM.

//This could be Reference or Product Name
$name = mysqli_real_escape_string($con, sanitize($_GET['search']));

//this could be a specific category or Empty(used to reference number)
$category = mysqli_real_escape_string($con, sanitize($_GET['category']));
$x = 0; 
$q = str_replace(array("\\",";"), "", $name);  // remove ALL backslashes & remove ALL ";" -> for sql security: no (simple) injection of commands
$q = trim($q);
$search_exploded = explode(" ", $q);

foreach($search_exploded as $search_each ) { 

$x++; 

   if($x == 1) { 
         $wherearr[]= "ads_title LIKE '%$search_each%' AND category_id = '$category' AND ads_active = 1 AND ads_end = 0"; 
   } else {     
         $wherearr[]= "ads_title LIKE '%$search_each%' AND category_id = '$category' AND ads_active = 1 AND ads_end = 0"; 
   }

}

//$wherearr[] is used to create a new variable $construct to insert to SQL like "Select * from Where $construct"    

I want to able people to search also by product reference.

The goal is, when the person inserts the reference, it will automatically go to the product.

Add this field:

 $wherearr[]= "ads_reference LIKE '%$search_each%' AND ads_active = 1 AND ads_end = 0";

How can I do it using the form that I created before?