Live search query using JS and PHP for QA forum

PHP Snippet 1:

foreach ($words as $keywords) { 
  echo $keywords.'<br>';
  $keyword = trim($keywords);
  if(strlen($keyword)>0){
    $sql="SELECT * FROM qa_posts WHERE title like '%".$keywords."%' OR content like '%".$keywords."%' OR tags like
    '%".$keywords."%' limit 10 "; 

  $q=mysqli_query($dbc,$sql);
  while($res=mysqli_fetch_array($q)){
   echo "<a href='".$res['slug']."'>".$res['title']."</a><br>";
  } 
 }
}