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BERHASIL DIUBAH!

EDITING: proses_edit_qris.php

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

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

$id = $_POST['id'];

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

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

// cek apakah 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, $ekstensi_diperbolehkan)) {
            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;
        }

// ambil gambar lama
        $get = mysqli_query($koneksi, "SELECT gambar FROM tb_qris WHERE id='$id'");
        $data = mysqli_fetch_assoc($get);

// hapus file lama jika ada
        if ($data && file_exists("../../uploads/qris/".$data['gambar'])) {
            unlink("../../uploads/qris/".$data['gambar']);
        }

// buat nama file baru (ANTI TABRAK)
        $nama_baru = uniqid('qris_') . '.' . $ext;

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

// update database
            $update = mysqli_query($koneksi, "UPDATE tb_qris SET gambar='$nama_baru', status='active' WHERE id='$id'");

if ($update) {
                echo "<script>alert('Berhasil mengubah gambar'); window.location='?page=qris';</script>";
            } else {
                echo "<script>alert('Gagal update 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>";
}
?>