file upload while edit row in database - php

Question

I am working on simple CRUD and I am facing difficulty with the "Edit section"
Long story short:
I have MySQL base with records, I am printing them on the front page, I have added two buttons for "Add new record" via <form and "Edit record" where I can edit any record.
The problem: in the "Add" section I can upload files during adding a new record.
here is the code for uploading a file in insert.php
// Include the database configuration file
include 'db.php';
$statusMsg = '';
// File upload path
$targetDir = "uploads/";
$fileName = basename($_FILES["file"]["name"]);
$targetFilePath = $targetDir . $fileName;
$fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);
if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])){
}
// Allow certain file formats
$allowTypes = array('jpg','png','jpeg','gif','pdf','doc','xlsx');
if(in_array($fileType, $allowTypes)){
}
// Upload file to server
if(move_uploaded_file($_FILES["file"]["tmp_name"], $targetFilePath)){
}
Via this one, I am uploading the file on the server and making the record into the database as the filename.
I would like to use the same way while editing records in order if the user wants to upload a file later, but when I use the same code I am getting
Warning: Undefined array key "file" in C:\xampp\htdocs\crud\edit.php on line 12
Warning: Trying to access array offset on value of type null in C:\xampp\htdocs\crud\edit.php on line 12
Here is my edit.php code:
<?php
// include database connection file
include_once("config.php");
// Check if form is submitted for user update, then redirect to homepage after update
if(isset($_POST['update']))
{
$id = $_POST['id'];
$toolnr=$_POST['toolnr'];
$status=$_POST['status'];
$toolname=$_POST['toolname'];
$serial=$_POST['serial'];
$usedat=$_POST['usedat'];
$owner=$_POST['owner'];
$calibrated=$_POST['calibrated'];
$nextcalibration=$_POST['nextcalibration'];
$vendors=$_POST['vendors'];
// update tools data
$result = mysqli_query($mysqli, "UPDATE tools SET toolnr='$toolnr',status='$status',toolname='$toolname',serial='$serial',usedat='$usedat',owner='$owner',calibrated='$calibrated',nextcalibration='$nextcalibration', vendors='$vendors', file_name = '$fileName' WHERE id=$id");
// Redirect to homepage to display updated tools in list
header("Location: index.php");
}
?>
<?php
// Display selected tool data based on id
// Getting id from url
$id = $_GET['id'];
// Fetech tool data based on id
$result = mysqli_query($mysqli, "SELECT * FROM tools WHERE id=$id");
while($user_data = mysqli_fetch_array($result))
{
$toolnr = $user_data['toolnr'];
$status = $user_data['status'];
$toolname = $user_data['toolname'];
$serial = $user_data['serial'];
$usedat = $user_data['usedat'];
$owner = $user_data['owner'];
$calibrated = $user_data['calibrated'];
$nextcalibration = $user_data['nextcalibration'];
$vendors = $user_data['vendors'];
}
?>
and here is the HTML pcs:
<tr>
<td>File upload:</td>
<td><input type="file" name="file" ></td>
</tr>
---- update ------
Here is the full edit.php code:
<?php
// include database connection file
include_once("config.php");
// Include the database configuration file
include 'db.php';
$statusMsg = '';
// File upload path
$targetDir = "uploads/";
$fileName = basename($_FILES["file"]["name"]);
$targetFilePath = $targetDir . $fileName;
$fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);
if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])){
}
// Allow certain file formats
$allowTypes = array('jpg','png','jpeg','gif','pdf','doc','xlsx');
if(in_array($fileType, $allowTypes)){
}
// Upload file to server
if(move_uploaded_file($_FILES["file"]["tmp_name"], $targetFilePath)){
}
// Check if form is submitted for tool update, then redirect to homepage after update
if(isset($_POST['update']))
{
$id = $_POST['id'];
$toolnr=$_POST['toolnr'];
$status=$_POST['status'];
$toolname=$_POST['toolname'];
$serial=$_POST['serial'];
$usedat=$_POST['usedat'];
$owner=$_POST['owner'];
$calibrated=$_POST['calibrated'];
$nextcalibration=$_POST['nextcalibration'];
$vendors=$_POST['vendors'];
// update tool data
$result = mysqli_query($mysqli, "UPDATE tools SET toolnr='$toolnr',status='$status',toolname='$toolname',serial='$serial',usedat='$usedat',owner='$owner',calibrated='$calibrated',nextcalibration='$nextcalibration', vendors='$vendors',file_name = '$fileName' WHERE id=$id");
// Redirect to homepage to display updated tool in list
header("Location: index.php");
}
?>
<?php
// Display selected tool data based on id
// Getting id from url
$id = $_GET['id'];
// Fetech tool data based on id
$result = mysqli_query($mysqli, "SELECT * FROM tools WHERE id=$id");
while($user_data = mysqli_fetch_array($result))
{
$toolnr = $user_data['toolnr'];
$status = $user_data['status'];
$toolname = $user_data['toolname'];
$serial = $user_data['serial'];
$usedat = $user_data['usedat'];
$owner = $user_data['owner'];
$calibrated = $user_data['calibrated'];
$nextcalibration = $user_data['nextcalibration'];
$vendors = $user_data['vendors'];
}
?>
Maybe I am working in the wrong way somehow...