Include inline SVG code using PHP function

getSvgIcon.php

public static function getSvgIcon($path, $class = '', $svgClass = '') {
    $full_path = $path;
    if ( ! file_exists($path)) {
        return '<!-- SVG file not found; '.$path.' -->';
    }

    $svg_content = file_get_contents($path);

    $dom = new DOMDocument();
    $dom->loadXML($svg_content);

    // remove unwanted comments
    $xpath = new DOMXPath($dom);
    foreach ($xpath->query('//comment()') as $comment) {
        $comment->parentNode->removeChild($comment);
    }

    // add class to svg
    if ( ! empty($svgClass)) {
        foreach ($dom->getElementsByTagName('svg') as $element) {
            $element->setAttribute('class', $svgClass);
        }
    }

    // remove unwanted tags
    $title = $dom->getElementsByTagName('title');
    if ($title['length']) {
        $dom->documentElement->removeChild($title[0]);
    }
    $desc = $dom->getElementsByTagName('desc');
    if ($desc['length']) {
        $dom->documentElement->removeChild($desc[0]);
    }
    $defs = $dom->getElementsByTagName('defs');
    if ($defs['length']) {
        $dom->documentElement->removeChild($defs[0]);
    }

    // remove unwanted id attribute in g tag
    $g =  $dom->getElementsByTagName('g');
    foreach ($g as $el) {
        $el->removeAttribute('id');
    }
    $mask =  $dom->getElementsByTagName('mask');
    foreach ($mask as $el) {
        $el->removeAttribute('id');
    }
    $rect =  $dom->getElementsByTagName('rect');
    foreach ($rect as $el) {
        $el->removeAttribute('id');
    }
    $path =  $dom->getElementsByTagName('path');
    foreach ($path as $el) {
        $el->removeAttribute('id');
    }
    $circle =  $dom->getElementsByTagName('circle');
    foreach ($circle as $el) {
        $el->removeAttribute('id');
    }
    $use =  $dom->getElementsByTagName('use');
    foreach ($use as $el) {
        $el->removeAttribute('id');
    }
    $polygon =  $dom->getElementsByTagName('polygon');
    foreach ($polygon as $el) {
        $el->removeAttribute('id');
    }
    $ellipse =  $dom->getElementsByTagName('ellipse');
    foreach ($ellipse as $el) {
        $el->removeAttribute('id');
    }

    $string = $dom->saveXML($dom->documentElement);

    // remove empty lines
    $string = preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $string);

    $cls = array('svg-icon');

    if ( ! empty($class)) {
        $cls = array_merge($cls, explode(' ', $class));
    }

    return '<span class="' . implode(' ', $cls) . '"><!--begin::Svg Icon | path:' . $path . '-->' . $string . '<!--end::Svg Icon--></span>';
}