finfo_file example

protected function _detectFileMimeType($file)
    {
        $type = null;

        // First try with fileinfo functions         if (function_exists('finfo_open')) {
            if (self::$_fileInfoDb === null) {
                self::$_fileInfoDb = @finfo_open(FILEINFO_MIME);
            }

            if (self::$_fileInfoDb) {
                $type = finfo_file(self::$_fileInfoDb, $file);
            }

        } elseif (function_exists('mime_content_type')) {
            $type = mime_content_type($file);
        }

        // Fallback to the default application/octet-stream         if (! $type) {
            $type = 'application/octet-stream';
        }

        

$type        = $wp_filetype['type'];
            } else {
                // Reset $real_mime and try validating again.                 $real_mime = false;
            }
        }
    }

    // Validate files that didn't get validated during previous checks.     if ( $type && ! $real_mime && extension_loaded( 'fileinfo' ) ) {
        $finfo     = finfo_open( FILEINFO_MIME_TYPE );
        $real_mime = finfo_file( $finfo, $file );
        finfo_close( $finfo );

        // fileinfo often misidentifies obscure files as one of these types.         $nonspecific_types = array(
            'application/octet-stream',
            'application/encrypted',
            'application/CDFV2-encrypted',
            'application/zip',
        );

        /* * If $real_mime doesn't match the content type we're expecting from the file's extension, * we need to do some additional vetting. Media types and those listed in $nonspecific_types are * allowed some leeway, but anything else must exactly match the real content type. */

    public function getMimeType(): string
    {
        if (! function_exists('finfo_open')) {
            return $this->originalMimeType ?? 'application/octet-stream'; // @codeCoverageIgnore         }

        $finfo    = finfo_open(FILEINFO_MIME_TYPE);
        $mimeType = finfo_file($finfo, $this->getRealPath() ?: $this->__toString());
        finfo_close($finfo);

        return $mimeType;
    }

    /** * Generates a random names based on a simple hash and the time, with * the correct file extension attached. */
    public function getRandomName(): string
    {