lib/FileWrapper.php
protected function setFileProperties(): void
    {
        if (is_null($this->path)) {
            throw \AWonderPHP\FileWrapper\NullPropertyException::propertyIsNull('path');
        }
        date_default_timezone_set('UTC');
        $this->filesize = filesize($this->path);
        $this->timestamp = filemtime($this->path);
        $this->lastmod = preg_replace('/\+0000$/', 'GMT', date('r', $this->timestamp));
        $inode = fileinode($this->path);
        // The f4a24ef etc strings - my understand in that
        //  because of caching proxies, the Etag needs to be
        //  different for different types of transfer encoding
        //  (e.g. brotli, gzip, deflate) or content could be
        //  delivered to a client that the client can not
        //  decompress.
        // This class assumes only text files will potentially
        //  be further compressed when serving.
        $etagEnd = 'f4a24ef';
        if ($this->istext) {
            if (ini_get('zlib.output_compression')) {
                $accept = 'identity';
                if ($this->minify) {
                    $etagEnd = '3d';
                } else {
                    $etagEnd = '4c';
                }
                if (isset($this->REQHEADERS['accept-encoding'])) {
                    $T = trim(strtolower($this->REQHEADERS['accept-encoding']));
                    if (strpos($T, 'gzip') !== false) {
                        $accept = 'gzip';
                    } elseif (strpos($T, 'deflate') !== false) {
                        $accept = 'deflate';
                    }
                }
                switch ($accept) {
                    case 'gzip':
                        $etagEnd .= '7aa23';
                        break;
                    case 'deflate':
                        $etagEnd .= '98db4';
                        break;
                    default:
                        $etagEnd .= 'c41ca';
                }
            }
        }
        $this->etag = sprintf("%x-%x-%x-%s", $inode, $this->filesize, $this->timestamp, $etagEnd);
        try {
            $this->checkFullFile();
        } catch (\ErrorException $e) {
            error_log($e->getMessage());
            $this->internalError = true;
            return;
        }
    }
protected function setFileProperties(): void
    {
        if (is_null($this->path)) {
            throw \AWonderPHP\FileWrapper\NullPropertyException::propertyIsNull('path');
        }
        date_default_timezone_set('UTC');
        $this->filesize = filesize($this->path);
        $this->timestamp = filemtime($this->path);
        $this->lastmod = preg_replace('/\+0000$/', 'GMT', date('r', $this->timestamp));
        $inode = fileinode($this->path);
        // The f4a24ef etc strings - my understand in that
        //  because of caching proxies, the Etag needs to be
        //  different for different types of transfer encoding
        //  (e.g. brotli, gzip, deflate) or content could be
        //  delivered to a client that the client can not
        //  decompress.
        // This class assumes only text files will potentially
        //  be further compressed when serving.
        $etagEnd = 'f4a24ef';
        if ($this->istext) {
            if (ini_get('zlib.output_compression')) {
                $accept = 'identity';
                if ($this->minify) {
                    $etagEnd = '3d';
                } else {
                    $etagEnd = '4c';
                }
                if (isset($this->REQHEADERS['accept-encoding'])) {
                    $T = trim(strtolower($this->REQHEADERS['accept-encoding']));
                    if (strpos($T, 'gzip') !== false) {
                        $accept = 'gzip';
                    } elseif (strpos($T, 'deflate') !== false) {
                        $accept = 'deflate';
                    }
                }
                switch ($accept) {
                    case 'gzip':
                        $etagEnd .= '7aa23';
                        break;
                    case 'deflate':
                        $etagEnd .= '98db4';
                        break;
                    default:
                        $etagEnd .= 'c41ca';
                }
            }
        }
        $this->etag = sprintf("%x-%x-%x-%s", $inode, $this->filesize, $this->timestamp, $etagEnd);
        try {
            $this->checkFullFile();
        } catch (\ErrorException $e) {
            error_log($e->getMessage());
            $this->internalError = true;
            return;
        }
    }
Sets class properties needed to generate a unique Etag and to serve the file.

@return void