PHP CRUD - File Array Update

Question

Updating an file array

I have a PHP Crud, and one section has file uploads. There are different file inputs for various documents with different 'names' and they have their separate columns in the database.

One section of those file upload fields requires that the input fields are added dynamically. And it works, the files are being saved to the database.

Here is the code for adding the files to the database:

if(isset($_FILES['contract_array'])){
    $name_array = $_FILES['contract_array']['name'];
    $tmp_name_array = $_FILES['contract_array']['tmp_name'];
    $type_array = $_FILES['contract_array']['type'];
    $size_array = $_FILES['contract_array']['size'];
    $error_array = $_FILES['contract_array']['error'];

    $ucontract=  "";

    for($i = 0; $i < count($tmp_name_array); $i++){

        $name_array[$i] = str_replace(' ', '_', $name . "-contract-" . $name_array[$i]);

        if(move_uploaded_file($tmp_name_array[$i], "upload_contract/".$name_array[$i])){
            $uontract.=$name_array[$i].",";

        } else {
               echo "move_uploaded_file function failed for ".$name_array[$i]."<br>";
        }
    }
}


if(!isset($errMSG))
{
    $stmt = $DB_con->prepare('INSERT INTO Table(userContract)VALUES(:ucontract)');
    $stmt->bindParam(':ucontract',$ucontract);
    $stmt->execute();

This works perfect. I add files from the contract_array[] input in an array to the database, and I can also retrieve them (view) on the index page.

However, the problem is when I try to update a profile. When I change the profile picture, or any other document, the update works fine. But I can't update these sections, with the contract_array[]

This is the update code for profile image (which works):

if(isset($_POST['btn_save_updates']))
{
$imgFile = $_FILES['user_image']['name'];
$tmp_dir = $_FILES['user_image']['tmp_name'];
$imgSize = $_FILES['user_image']['size'];

if($imgFile)
{
        $upload_dir = 'user_images/'; // upload directory
        $imgExt = strtolower(pathinfo($imgFile,PATHINFO_EXTENSION)); // get image extension
        $valid_extensions = array('jpeg', 'jpg', 'png', 'gif'); // valid extensions
        $userpic = $name . "-image-" . rand(1000,1000000).".".$imgExt;
        if(in_array($imgExt, $valid_extensions))
        {
            if($imgSize < 5000000)
            {

                move_uploaded_file($tmp_dir,$upload_dir.$userpic);
            }
            else
            {
                $errMSG = "Sorry, your file is too large it should be less then 5MB";
            }
        }
        else
        {
            $errMSG = "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
        }
    }
    else
    {
        // if no image selected the old image remain as it is.
        $userpic = $edit_row['userPic']; // old image from database
    }  

Now when I want to update the Contract 2 file from contract_array[], it doesn't update. Other things I try, delete all file values, and I'm left with no records at all. Here is the code for updating the contract_array:

        if($name_array)
        {

        $name_array = $_FILES['contract_array']['name'];
        $tmp_name_array = $_FILES['contract_array']['tmp_name'];
        $type_array = $_FILES['contract_array']['type'];
        $size_array = $_FILES['contract_array']['size'];
        $error_array = $_FILES['contract_array']['error'];

        $ucontract=  "";

        for($i = 0; $i < count($tmp_name_array); $i++){

            $name_array[$i] = str_replace(' ', '_', $name . "-contract-new" . $name_array[$i]);

            if(move_uploaded_file($tmp_name_array[$i], "upload_contract/".$name_array[$i])){

                $uucontract.=$name_array[$i].",";
            } else {
                echo "move_uploaded_file function failed for ".$name_array[$i]."<br>";
            }
        }
    }
    else
    {
    // if no image selected the old image remain as it is.
    $ucontract = $edit_row['userContract']; // old image from database
}