src/AssetsManager.php
private function detectMimeType($file)
    {
        $fileParts = explode('.', $file);
        $extension = array_pop($fileParts);
        $extension = strtolower($extension);

        if (array_key_exists($extension, $this->mimeTypes)) {
            return $this->mimeTypes[$extension];
        }

        if (function_exists('finfo_open')) {
            $finfo    = finfo_open(FILEINFO_MIME_TYPE);
            $mimeType = finfo_file($finfo, $file);
            finfo_close($finfo);

            return $mimeType;
        }

        return 'application/octet-stream';
    }
private function detectMimeType($file)
    {
        $fileParts = explode('.', $file);
        $extension = array_pop($fileParts);
        $extension = strtolower($extension);

        if (array_key_exists($extension, $this->mimeTypes)) {
            return $this->mimeTypes[$extension];
        }

        if (function_exists('finfo_open')) {
            $finfo    = finfo_open(FILEINFO_MIME_TYPE);
            $mimeType = finfo_file($finfo, $file);
            finfo_close($finfo);

            return $mimeType;
        }

        return 'application/octet-stream';
    }
private function detectMimeType ( $ file ) { $ fileParts = explode ( '.' , $ file ) ; $ extension = array_pop ( $ fileParts ) ; $ extension = strtolower ( $ extension ) ; if ( array_key_exists ( $ extension , $ this -> mimeTypes ) ) { return $ this -> mimeTypes [ $ extension ] ; } if ( function_exists ( 'finfo_open' ) ) { $ finfo = finfo_open ( FILEINFO_MIME_TYPE ) ; $ mimeType = finfo_file ( $ finfo , $ file ) ; finfo_close ( $ finfo ) ; return $ mimeType ; } return 'application/octet-stream' ; }
Detects file mime type from extension or using finfo_file if exists.

@param string $file the file to examine
@return string the mime type
Detects file mime type from extension or using finfo_file if exists .