php 正则获取图片url

    /**
     * 获取图片url
     * @param $content
     * @return bool
     */
    public static function getImageUrl($content){
        preg_match_all("/(src)=[\"|\"| ]{0,}(http:\/\/(.*)\.(gif|jpg|jpeg|bmp|png|JPEG|GIF|PNG))[\"|\"| ]{0,}/isU", $content, $match);
        if(isset($match[2]) && !empty($match[2])){
            return $match[2];
        }
        return false;
    }