Graph::Fetch PHP Method

    public function Fetch($header = TRUE, $defer_javascript = TRUE)
    {
        $content = '';
        if ($header) {
            $content .= '<?xml version="1.0"';
            // encoding comes before standalone
            if (strlen($this->encoding) > 0) {
                $content .= " encoding=\"{$this->encoding}\"";
            }
            // '>' is with \n so as not to confuse syntax highlighting
            $content .= " standalone=\"no\"?" . ">\n";
            if ($this->doctype) {
                $content .= '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" ' . '"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">' . "\n";
            }
        }
        // set the precision - PHP default is 14 digits!
        $old_precision = ini_set('precision', $this->precision);
        // display title and description if available
        $heading = '';
        if ($this->title) {
            $heading .= $this->Element('title', NULL, NULL, $this->title);
        }
        if ($this->description) {
            $heading .= $this->Element('desc', NULL, NULL, $this->description);
        }
        try {
            $this->CheckValues($this->values);
            // get the body content from the subclass
            $body = $this->DrawGraph();
        } catch (Exception $e) {
            $body = $this->ErrorText($e->getMessage());
        }
        $svg = array('width' => $this->width, 'height' => $this->height, 'version' => '1.1', 'xmlns:xlink' => 'http://www.w3.org/1999/xlink');
        if (!$defer_javascript) {
            $js = $this->FetchJavascript();
            if ($js != '') {
                $heading .= $js;
                $onload = Graph::$javascript->GetOnload();
                if ($onload != '') {
                    $svg['onload'] = $onload;
                }
            }
        }
        // insert any gradients that are used
        foreach ($this->gradients as $key => $gradient_id) {
            $this->defs[] = $this->MakeLinearGradient($gradient_id, $this->colours[$key]);
        }
        // show defs and body content
        $heading .= $this->Element('defs', NULL, NULL, implode('', $this->defs));
        if ($this->namespace) {
            $svg['xmlns:svg'] = "http://www.w3.org/2000/svg";
        } else {
            $svg['xmlns'] = "http://www.w3.org/2000/svg";
        }
        // add any extra namespaces
        foreach ($this->namespaces as $ns => $url) {
            $svg['xmlns:' . $ns] = $url;
        }
        // display version string
        if ($this->show_version) {
            $text = array('x' => $this->pad_left, 'y' => $this->height - 3);
            $style = array('font-family' => 'monospace', 'font-size' => '12px', 'font-weight' => 'bold');
            $body .= $this->ContrastText($text['x'], $text['y'], SVGGRAPH_VERSION, 'blue', 'white', $style);
        }
        $content .= $this->Element('svg', $svg, NULL, $heading . $body);
        // replace PHP's precision
        ini_set('precision', $old_precision);
        return $content;
    }