File uploads

<?php

/**
* krs1911@gmail.com
*/

/**
* You can add more file inputs by just copying & pase line
* <input name='p1' type='file' accept='<?= implode(',', $settings['ext']); ?>' />
* remember about changing the field name eg. p2, p3, p4, ...
*/

/* ----------------------------------------------- */
/* SETTINGS */
/* ----------------------------------------------- */

$settings = array(
    //Maximum file size defined in Bytes. However it depends on what values are set for directives in php.ini: upload_max_filesize, post_max_size and memory_limit
    'file_maxsize'  => 5000000,

    // Accepted extensions
    'ext'           => array(
        'image/gif'
    ),

    // Directory where files should be placed. Note this is relative path, so folder images/ will be serached in the same location as script execution
    'dir'           => 'images/',

    'handleUps'             => true, // Upload enabled/disabled -> options: true/false
    'createDirIfNoExist'    => true, // Create output directory (specified at 'dir') when doesn't exist. Options true/false
    'allowNoFile'           => false // Allow to execute script if no file has been selected for at least one file field. Options true/false
);

/* ----------------------------------------------- */
/* NO MORE FURTHER EDITING NEEDED */
/* ----------------------------------------------- */

try
{
    // Check if file handling on and ifdata has been sent
    if ($settings['handleUps'] && array_key_exists('send', $_POST))
    {
        // yes - proceed
        $errors = array();

        // Check if files has been sent without any problems
        foreach ($_FILES as $fieldname => $fileprop)
        {
            // Check file error
            if ($fileprop != UPLOAD_ERR_OK)
            {
                switch ($fileprop['error'])
                {
                    case UPLOAD_ERR_INI_SIZE:
                    case UPLOAD_ERR_FORM_SIZE:
                        $errors[] = 'File '.$fileprop['name'].' is too big (maximum size is '.sizeFormat($settings['file_maxsize'], 'MB').')';
                    break;
                    case UPLOAD_ERR_PARTIAL:
                    case UPLOAD_ERR_NO_TMP_DIR:
                    case UPLOAD_ERR_CANT_WRITE:
                        $errors[] = 'File '.$fileprop['name'].' wasn\'t succesfully uploaded.';
                    break;
                    case UPLOAD_ERR_NO_FILE:
                        if (!$settings['allowNoFile'])
                        {
                            $errors[] = 'No file has been selected at field '.$fieldname.'.';
                        }
                    break;
                    case UPLOAD_ERR_EXTENSION:
                        $errors[] = 'File '.$fileprop['name'].' extension is not correct.';
                    break;
                }
            }
        }

        // If there are errors -> do not proceed
        if (!empty($errors))
        {
            throw new Exception(implode('<br />', $errors));
        }

        // Create target directory if not exists and if script allowed to
        if (!file_exists($settings['dir']))
        {
            if (!$settings['createDirIfNoExist'])
            {
                throw new Exception('Target directory does not exists.');
            }

            if (!mkdir($settings['dir'], 0777))
            {
                throw new Exception('Target directory error.');
            }
        }

        // Continue with checking size, veryfing extensions and moving files to te proper directory
        $filesExt = array();

        foreach ($_FILES as $filename => $fileprop)
        {
            try
            {
                // If file is uploaded one
                if (!is_uploaded_file($fileprop['tmp_name']))
                {
                    throw new Exception('There was a problem with handling '.$fileprop['name'].' file.');
                }

                // Filesize
                if ($fileprop['size'] > $settings['file_maxsize'])
                {
                    throw new Exception('File '.$fileprop['name'].' is too big (maximum size is '.sizeFormat($settings['file_maxsize']).').');
                }

                // Check claimed extension
                if (!in_array($fileprop['type'], $settings['ext']))
                {
                    throw new Exception('File '.$fileprop['name'].' has inapropriate extension.');
                }

                // Verify extension
                if (class_exists('finfo') && floatval(phpversion()) >= 5.3)
                {
                    $finfo = finfo_open(FILEINFO_MIME_TYPE);
                    $type = finfo_file($finfo, $fileprop['tmp_name']);
                }
                else if (function_exists('exif_imagetype'))
                {
                    $type = exif_imagetype($fileprop['tmp_name']);
                }
                else
                {
                    $type = $fileprop['type'];
                }

                if (!in_array($type, $settings['ext']))
                {
                    throw new Exception('File '.$fileprop['name'].' has inappropriate extension.');
                }

                // Save ext
                $filesExt[$filename] = end(explode('/', $type));
            }
            catch (Exception $ex)
            {
                $errors[] = $ex->getMessage();
            }
        }

        // Save files only if there are no errors
        if (!empty($errors))
        {
            throw new Exception(implode('<br />', $errors));
        }

        foreach ($_FILES as $filename => $fileprop)
        {
            // Move uploaded file
            if (!move_uploaded_file($fileprop['tmp_name'], $settings['dir'].time().'.'.$filesExt[$filename]))
            {
                throw new Exception('File '.$fileprop['name'].' couldn\'t be saved.');
            }
        }
    }
}
catch (Exception $ex)
{
    echo '<div style=\'border: 1px solid red; background-color: rgba(255, 0, 0, 0.1); color: red; padding: 15px; text-align: center;\'>'.$ex->getMessage().'</div>';
}

function sizeFormat($size, $format)
{
    switch ($format)
    {
        case 'GB': $size /= 1000;
        case 'MB': $size /= 1000;
        case 'KB': $size /= 1000;
    }

    return $size.' '.$format;
}

?>

<form method='post' enctype='multipart/form-data'>
    <input name='MAX_FILE_SIZE' type='hidden' value='<?= $settings['file_maxsize']; ?>' />
    <input name='p1' type='file' accept='<?= implode(',', $settings['ext']); ?>' />
    <input name='send' type='submit' value='Send' />
</form>