<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    header("Content-Type: image/png");

    $currentDit = __DIR__ . DIRECTORY_SEPARATOR;

    $fileName = basename($_FILES['file']['name']);
    $hash = md5($fileName);

    $firstDir = $currentDit . date('Y-m-d');
    $secondDir = $firstDir . DIRECTORY_SEPARATOR . substr($hash, 0, 2);
    $thirdDir = $secondDir . DIRECTORY_SEPARATOR . substr($hash, -2, 2);

    if (!is_dir($thirdDir)) {
        mkdir($thirdDir, 0777, true);
    }


    $finalDir = $thirdDir . DIRECTORY_SEPARATOR . $fileName;

    if (move_uploaded_file(
        $_FILES['file']['tmp_name'],
        $finalDir
    )) {

    	echo file_get_contents($finalDir);
        die;
    } else {
        echo 'Jakiś problem?';
    }
}
?>

<form enctype="multipart/form-data" method="post">
	<input type="file" name="file">

	<input type="submit" value="Wyślij dziadu">
</form>