I&#39;m trying to put together a function that receives a file path, identifies what it is, sets the appropriate headers, and serves it just like Apache would.

The reason I am doing this is because I need to use PHP to process some information about the request before serving the file.

**Speed is critical**

**virtual() isn&#39;t an option**

**Must work in a shared hosting environment where the user has no control of the web server (Apache/nginx, etc)**


Here&#39;s what I&#39;ve got so far:

    File::output($path);

    &lt;?php
    class File {
    static function output($path) {
        // Check if the file exists
        if(!File::exists($path)) {
            header(&#39;HTTP/1.0 404 Not Found&#39;);
            exit();
        }

        // Set the content-type header
        header(&#39;Content-Type: &#39;.File::mimeType($path));

        // Handle caching
        $fileModificationTime = gmdate(&#39;D, d M Y H:i:s&#39;, File::modificationTime($path)).&#39; GMT&#39;;
        $headers = getallheaders();
        if(isset($headers[&#39;If-Modified-Since&#39;]) &amp;&amp; $headers[&#39;If-Modified-Since&#39;] == $fileModificationTime) {
            header(&#39;HTTP/1.1 304 Not Modified&#39;);
            exit();
        }
        header(&#39;Last-Modified: &#39;.$fileModificationTime);

        // Read the file
        readfile($path);

        exit();
    }

    static function mimeType($path) {
        preg_match(&quot;|\.([a-z0-9]{2,4})$|i&quot;, $path, $fileSuffix);

        switch(strtolower($fileSuffix[1])) {
            case &#39;js&#39; :
                return &#39;application/x-javascript&#39;;
            case &#39;json&#39; :
                return &#39;application/json&#39;;
            case &#39;jpg&#39; :
            case &#39;jpeg&#39; :
            case &#39;jpe&#39; :
                return &#39;image/jpg&#39;;
            case &#39;png&#39; :
            case &#39;gif&#39; :
            case &#39;bmp&#39; :
            case &#39;tiff&#39; :
                return &#39;image/&#39;.strtolower($fileSuffix[1]);
            case &#39;css&#39; :
                return &#39;text/css&#39;;
            case &#39;xml&#39; :
                return &#39;application/xml&#39;;
            case &#39;doc&#39; :
            case &#39;docx&#39; :
                return &#39;application/msword&#39;;
            case &#39;xls&#39; :
            case &#39;xlt&#39; :
            case &#39;xlm&#39; :
            case &#39;xld&#39; :
            case &#39;xla&#39; :
            case &#39;xlc&#39; :
            case &#39;xlw&#39; :
            case &#39;xll&#39; :
                return &#39;application/vnd.ms-excel&#39;;
            case &#39;ppt&#39; :
            case &#39;pps&#39; :
                return &#39;application/vnd.ms-powerpoint&#39;;
            case &#39;rtf&#39; :
                return &#39;application/rtf&#39;;
            case &#39;pdf&#39; :
                return &#39;application/pdf&#39;;
            case &#39;html&#39; :
            case &#39;htm&#39; :
            case &#39;php&#39; :
                return &#39;text/html&#39;;
            case &#39;txt&#39; :
                return &#39;text/plain&#39;;
            case &#39;mpeg&#39; :
            case &#39;mpg&#39; :
            case &#39;mpe&#39; :
                return &#39;video/mpeg&#39;;
            case &#39;mp3&#39; :
                return &#39;audio/mpeg3&#39;;
            case &#39;wav&#39; :
                return &#39;audio/wav&#39;;
            case &#39;aiff&#39; :
            case &#39;aif&#39; :
                return &#39;audio/aiff&#39;;
            case &#39;avi&#39; :
                return &#39;video/msvideo&#39;;
            case &#39;wmv&#39; :
                return &#39;video/x-ms-wmv&#39;;
            case &#39;mov&#39; :
                return &#39;video/quicktime&#39;;
            case &#39;zip&#39; :
                return &#39;application/zip&#39;;
            case &#39;tar&#39; :
                return &#39;application/x-tar&#39;;
            case &#39;swf&#39; :
                return &#39;application/x-shockwave-flash&#39;;
            default :
                if(function_exists(&#39;mime_content_type&#39;)) {
                    $fileSuffix = mime_content_type($path);
                }
                return &#39;unknown/&#39; . trim($fileSuffix[0], &#39;.&#39;);
        }
    }
    }
    ?&gt;


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Fastest Way to Serve a File Using PHP