php - SQL Fatal Error with non-objects -


i have been stuck on problem few days , can't seems work out! trying delete blog entry title posted form through sql , have tried 2 ways, both fail , give following outputs/errors:

test inputstring(10) "test input" fatal error: call member function bind_param() on non-object in 'filepath' on line 163

this code including other way have tried: 

$delentry = $_post['postentry'];  echo $delentry;  //$query2 = "delete blog title =\"" . $delentry . "\""; //echo $query2; //$result2 = mysqli_query($mysqli, $query2);  //if (!$result2) { //die('invalid query: ' . mysql_error()); //}  $stmt2 = $mysqli->prepare("delete blog title = ?"); var_dump($delentry); $stmt2->bind_param('s', $delentry); $stmt2->execute();  $stmt2->close(); //header("location: listall.php");   exit;

line 163 is:

$stmt2->bind_param('s', $delentry);

any appreciated, thanks!

thanks link @qirel none of solutions have worked, have closed previous forms of $mysqli, attempted enable pdoexceptions telling me cannot done on non-objects , have checked "delete blog title = "test input"" work database. stuck, more appreciated


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