How to implode image file names into mysql database - php

Question

I am uploading multiple images to my sql database but my implode method isn't working...
if(isset($_POST['submit'])) {
$id = $_POST['id'];
for($i = 0; $i < count($_FILES['file_upload']['name']); $i++){
$filetmp = $_FILES['file_upload']['tmp_name'][$i];
$filename = basename($_FILES['file_upload']['name'][$i]);
$filetype = $_FILES['file_upload']['type'][$i];
$filepath = "../images/".$filename;
move_uploaded_file($filetmp,$filepath);
}
$mainfiles = implode(", ", $filename);
$sql = "INSERT INTO pictures2 (";
$sql .= "image, photograph_id";
$sql .= ") VALUES ('";
$sql .= $database->escape_character($mainfiles) ."', '";
$sql .= $id ."')";
$result = $database->query($sql);
if($result){
$session->message('<div class="success-msg">Pictures uploaded sucessfully.</div>');
}
}

Answer 1

$filename should be an array. You are passing string into implode function. Do something like this.
if(isset($_POST['submit'])) {
$id = $_POST['id'];
$filename= [];
for($i = 0; $i < count($_FILES['file_upload']['name']); $i++){
$filetmp = $_FILES['file_upload']['tmp_name'][$i];
$filename[] = basename($_FILES['file_upload']['name'][$i]);
$filetype = $_FILES['file_upload']['type'][$i];
$filepath = "../images/".$filename[$i];
move_uploaded_file($filetmp,$filepath);
}
$mainfiles = implode(", ", $filename);
$sql = "INSERT INTO pictures2 (";
$sql .= "image, photograph_id";
$sql .= ") VALUES ('";
$sql .= $database->escape_character($mainfiles) ."', '";
$sql .= $id ."')";
$result = $database->query($sql);
if($result){
$session->message('<div class="success-msg">Pictures uploaded sucessfully.</div>');
}
}
Hope this helps.

Answer 2

Made changes like this, I am considering $id is your photograph_id
if (isset($_POST['submit'])) {
$id = $_POST['id'];
for ($i = 0; $i < count($_FILES['file_upload']['name']); $i++) {
$filetmp = $_FILES['file_upload']['tmp_name'][$i];
$filename[] = [$id, basename($_FILES['file_upload']['name'][$i])]; // here changes
$filetype = $_FILES['file_upload']['type'][$i];
$filepath = "../images/" . $filename;
move_uploaded_file($filetmp, $filepath);
}
// I made changes at below code
$valueStr = array_map(function ($item) {
return "('" . implode("','", $item) . "'),"; // to convert into `,` separated values
}, $filename);
$mainfiles = rtrim(implode("", $valueStr), ','); // removing right training `,`
$sql = "INSERT INTO pictures2 (";
$sql .= "image, photograph_id";
$sql .= ") VALUES ('";
$sql .= $database->escape_character($mainfiles) . "', '";
$sql .= $id . "')";
$result = $database->query($sql);
if ($result) {
$session->message('<div class="success-msg">Pictures uploaded sucessfully.</div>');
}
}