Change the color of an SVG image file

function RecolorImage($ImageSvgFile, $ImageColor)
    {
    $FileContents = file_get_contents($ImageSvgFile);
    $doc = new DOMDocument();
    $dom->preserveWhiteSpace = False;
    $doc->loadXML($FileContents) or die('Failed to load SVG file ' . $ImageSvgFile . ' as XML.  It probably contains malformed data.');
    $SvgTags = $doc->getElementsByTagName("svg");
    if (preg_match('/^([0-9a-f]{1,2}){3}$/i', $ImageColor) == false)
        {
        die('Invalid color: ' . $ImageColor);
        }
    //Look at each element in the XML and add or replace it's Fill attribute to change the color.
    $AllTags = $doc->getElementsByTagName("path");
    foreach ($AllTags as $ATag)
        {
        $VectorColor = $ATag->getAttribute('fill');
        if (strtoupper($VectorColor) != '#FFFFFF')
            {
            //This vector is not white, so change it's color.
            $ATag->setAttribute('fill', '#' . $ImageColor);
            $FileContents = $doc->saveXML($doc);
            }
        }
    Return $FileContents;
    }