Updating Mysqli database with all file names from the upload form - php

Question

I found this code and it all works file uploads to the correct folder that is fine.
image - is main image that works it inserts one image name into the database field.
but when i try to insert all the names of the files uploaded in images field it only inserts the last file name.
$imageDirectory = "img/cars/" . $resultget->id . "";
$newDirName = generateRandomString(10);
$targetDir = $imageDirectory."/";
if (!file_exists($targetDir)) {
mkdir($targetDir, 0777, true);
} else {
$targetDir = $imageDirectory."/";
}
// Count total files
$fileCount = count($_FILES['the_file']['name']);
// Iterate through the files
for($i = 0; $i < $fileCount; $i++){
$target_dir = $imageDirectory."/";
$target_file = $target_dir . basename($_FILES["the_file"]["name"][$i]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
// Check if image file is a actual image or fake image
$check = getimagesize($_FILES["the_file"]["tmp_name"][$i]);
if($check !== false) {
//echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
$errorTxt = "File is not an image.";
$uploadOk = 0;
}
// Check if file already exists
if (file_exists($target_file)) {
$errorTxt = "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
// if ($_FILES["new_young"]["size"] > 500000) {
// $errorTxt = "Sorry, your file is too large.";
// $uploadOk = 0;
// }
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
$errorTxt = "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
$temp = explode(".", $_FILES["the_file"]["name"][$i]);
$newfilename = str_replace( '.', '', strval( microtime( true ) ) ) . '.' . end( $temp );
$target_file = $target_dir . $newfilename;
if (file_exists($target_file)) {
$errorTxt = "Sorry, file already exists.";
$uploadOk = 0;
}
if ($uploadOk == 0) {
// if everything is ok, try to upload file
echo $errorTxt;
} else {
if (move_uploaded_file($_FILES["the_file"]["tmp_name"][$i], $target_file )) {
$checking = $resultget->images;
$checkimage = $resultget->image;
if(empty($checkimage)) {
$sqlimage = "UPDATE individual_cars SET image = '$newfilename' WHERE id = '$image_id'";
mysqli_query($mysqli, $sqlimage) or die(mysqli_error($mysqli));
}
foreach (array($newfilename) as $filename) {
if(empty($checking)) {
echo implode(',', $filename);
$sqlimage = "UPDATE individual_cars SET images = '" . implode(',', $filename) . "' WHERE id = '" . $resultget->id . "'";
mysqli_query($mysqli, $sqlimage) or die(mysqli_error($mysqli));
} else {
echo implode(',', $filename);
$sqlimage = "UPDATE individual_cars SET images = '," . implode(',', $filename) . "' WHERE id = '" . $resultget->id . "'";
mysqli_query($mysqli, $sqlimage) or die(mysqli_error($mysqli));
}
}
} else {
$errorTxt = "Sorry, there was an error uploading your file.";
}
}
}
Im checking images if empty because if a file name is already in that field i want it to continue so like this
example: 12345.png is already in there so if its not empty i want 12345.png, 54321.png and so on.
but its only inserting the last image name
sorry this is my first time posting.