Trait for guessing mime types and extensions of files

GuessesMimeTypesAndExtentions.php

<?php

namespace App\Traits;
// composer require ralouphie/mimey
use Mimey;

trait GuessesMimeTypesAndExtentions
{
    /**
     * Guesses the mime type of a file based off of the extension in the file name
     * @param string $filename
     * @return mixed
     */
    protected function guessMimeTypeByExtension($filename)
    {
        if ( ! $filename)
        {
            return null;
        }
        $dotPos = strrpos($filename, '.');
        if ( ! $dotPos)
        {
            return null;
        }
        $extention = substr($filename, $dotPos + 1);
        $mimey = new Mimey\MimeTypes;
        return $mimey->getMimeType($extention);
    }

    /**
     * Guesses the extension of a file based off of the mime type given
     * @param string $mimeType
     * @return mixed
     */
    protected function guessExtensionByMimeType($mimeType)
    {
        if ( ! $mimeType)
        {
            return null;
        }
        $mimey = new Mimey\MimeTypes;
        return $mimey->getExtension($mimeType);
    }

    /**
     * Guesses the mime type of a file given the real path of the file in the system
     * @param string $filePath
     * @return mixed
     */
    protected function guessMimeTypeByFilePath($filePath)
    {
        if ( ! $filePath)
        {
            return null;
        }
        $finfo = finfo_open(FILEINFO_MIME_TYPE);
        $mimeType = finfo_file($finfo, $filePath);
        finfo_close($finfo);
        return $mimeType;
    }
}