image upload test for php via post

fileupload_debug.php

<?php

function return_bytes($val) {
    $val = trim($val);
    $last = strtolower($val[strlen($val)-1]);
    switch($last) {
        // The 'G' modifier is available since PHP 5.1.0
        case 'g':
            $val *= 1024;
        case 'm':
            $val *= 1024;
        case 'k':
            $val *= 1024;
    }

    return $val;
}

$debug = array(
    'error' => '',
    'data' => array()
);

if ($_SERVER['REQUEST_METHOD'] === 'POST') {

    if (is_uploaded_file($_FILES['image_upload']['tmp_name'])) {
        $debug['data']['files'] = $_FILES;
        if ($_FILES["image_upload"]["error"] == UPLOAD_ERR_OK) {
        $info = getimagesize($_FILES['image_upload']['tmp_name']);
            if ($info === FALSE) {
                $debug['error'] = "Unable to determine image type of uploaded file";
            } else {
                $debug['data']['image'] = $info;
            }
        } else {
            $debug['error'] = "upload has an error";
        }
    } else {
        $debug['error'] = "is not uploaded file";
    }

    $debug['data']['config'] = array(
        ini_get('post_max_size'),
        ini_get('upload_max_filesize'),
    );
}

?>

<pre><?php print_r($debug) ?></pre>

<form enctype="multipart/form-data" action="" method="POST">
    <input type="hidden" name="MAX_FILE_SIZE" value="<?php echo return_bytes(ini_get('post_max_size')); ?>" />
    <input name="image_upload" type="file" />
    <input type="submit" value="send" />
</form>