i got mysqli_error(). what is wrong and where should i repair my code

[iomit]

here is my php code

$conn=new PDO('mysql:host=xxx; dbname=xxx', 'xxxx', '') or die(mysql_error());
if(isset($_POST['submit'])!=""){
	
		
	$title = $_POST['title'];// file title
	$date = $_POST['date'];// file date
	$ref = $_POST['ref'];// file ref
	$from_to = $_POST['from_to'];// person incharge
	$details = $_POST['details'];// details
	$location = $_POST['location'];// file location
	$status = $_POST['status'];// file status	
	
  $name=$_FILES['photo']['name'];
  $size=$_FILES['photo']['size'];
  $type=$_FILES['photo']['type'];
  $temp=$_FILES['photo']['tmp_name'];
  move_uploaded_file($temp,"upload/".$name);
$query=$conn->query("INSERT INTO upload(title, date, ref, from_to, details, location, status, name)VALUES('$title', '$date', '$ref', '$from_to', '$details', '$location', '$status', $name)");
if($query){
header("location:index.php");
	}
else{
die(mysqli_error());
	}
}
?>

and here my html form. hope someone will help me.

			<form enctype="multipart/form-data" action="" name="form" method="post">

			
				<table class="table table-bordered table-responsive">
	
    <tr>
    	<td><label class="control-label">Title</label></td>
        <td><input class="form-control" type="text" name="title" placeholder="Title" required /></td>
    </tr>
    
    <tr>
    	<td><label class="control-label">Date</label></td>
        <td><input class="form-control" type="date" name="date" placeholder="Date" required /></td>
    </tr>
	
    <tr>
    	<td><label class="control-label">Ref Num</label></td>
        <td><input class="form-control" type="text" name="ref" placeholder="Ref Num" required /></td>
    </tr>
    <tr>
	
    	<td><label class="control-label">Person Incharge</label></td>
        <td><input class="form-control" type="text" name="from_to" placeholder="Person Incharge" required /></td>
    </tr>
    
    	<td><label class="control-label">Details</label></td>
        <td><textarea class="form-control" name="details" placeholder="Details" required ></textarea> </td>
    </tr>
    
    	<td><label class="control-label">Location</label></td>
        <td><p><select name="location" required >
			<option value="Local A">Local A</option>
			<option value="Local B">Local B</option>
			<option value="Local C">Local C</option>
</select></p></td>
    </tr>
    
    	<td><label class="control-label">Status</label></td>
        <td><p><select name="status" required >
			<option value="Active">Active</option>
			<option value="Semi-Active">Semi-Active</option>
			<option value="Inactive">Inactive</option>
</select></p></td>
    </tr>
    
    <tr>
        <td colspan="2">				Select File
					<input type="file" name="photo" id="photo" required />
					<input type="submit" name="submit" id="submit" value="Submit" />
			
        </td>
    </tr>
    
    </table>
	</form>

[Jacques1]

You're using three(!) incompatible database APIs at the same time, and none of them correctly. How could this possibly work?

 

Choose one, preferrably PDO, and learn how to use it.

[benanamen]

Additionally, depending on the name of a button to be submitted will completely fail in certain circumstances. You need to check the REQUEST METHOD.

if ($_SERVER['REQUEST_METHOD'] == 'POST')

Don't create variables for nothing

 

Stop outputting internal system errors to the user. That information is only good to hackers.