Tjek linie i tekstfil imod database

$indhold = file('dinfil.txt');
$ids = join(',',$indhold);
$res = mysql_query("SELECT * FROM din_table WHERE id IN ($ids)");

$indhold = file('dinfil.txt');
for($i = 0; $i < count($indhold); $i++){
  $res = mysql_query("SELECT * FROM din_table WHERE id = '".$indhold[$i]."' LIMIT 1");
  if(mysql_num_rows($res) == 1){
    echo $indhold[$i] . ' fandtes<br />';
  }else{
    echo $indhold[$i] . ' fandtes ikke<br />';
  }
}