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BERHASIL DIUBAH!

EDITING: tambah_qris.php

<?php
if ($c['level'] == "superadmin") {

if (isset($_POST['upload'])) {

$allowed_ext = array('png','jpg','jpeg','gif');

$nama_file   = $_FILES['file']['name'];
        $tmp_file    = $_FILES['file']['tmp_name'];
        $ukuran_file = $_FILES['file']['size'];

$status = 'active';

// cek file dipilih
        if ($nama_file == "") {
            echo "<script>alert('Pilih gambar terlebih dahulu!'); window.location='?page=qris';</script>";
            exit;
        }

// ambil ekstensi
        $ext = strtolower(pathinfo($nama_file, PATHINFO_EXTENSION));

// validasi ekstensi
        if (!in_array($ext, $allowed_ext)) {
            echo "<script>alert('Format harus PNG, JPG, JPEG, GIF'); window.location='?page=qris';</script>";
            exit;
        }

// validasi ukuran (max 2MB)
        if ($ukuran_file > 2000000) {
            echo "<script>alert('Ukuran file terlalu besar! Max 2MB'); window.location='?page=qris';</script>";
            exit;
        }

// buat nama unik
        $nama_baru = uniqid('qris_') . '.' . $ext;

// upload file
        if (move_uploaded_file($tmp_file, '../../uploads/qris/' . $nama_baru)) {

// simpan ke database (WAJIB pakai nama kolom)
            $query = mysqli_query($koneksi, "INSERT INTO tb_qris (gambar, status) VALUES ('$nama_baru', '$status')");

if ($query) {
                echo "<script>alert('Berhasil menambahkan gambar'); window.location='?page=qris';</script>";
            } else {
                echo "<script>alert('Gagal simpan ke database'); window.location='?page=qris';</script>";
            }

} else {
            echo "<script>alert('Upload file gagal'); window.location='?page=qris';</script>";
        }
    }

} else {
    echo "<script>window.location='?page=dashboard';</script>";
}
?>