PHP将相对路径URL转换为绝对路径URL

/**
    * 将一个URL转换为完整URL
    * PHP将相对路径URL转换为绝对路径URL
    */
    function format_url($srcurl, $baseurl) {  
    $srcinfo = parse_url($srcurl);
    if(isset($srcinfo['scheme'])) {
        return $srcurl;
    }
    $baseinfo = parse_url($baseurl);
    $url = $baseinfo['scheme'].'://'.$baseinfo['host'];
    if(substr($srcinfo['path'], 0, 1) == '/') {
        $path = $srcinfo['path'];
    }else{
        $filename=  basename($baseinfo['path']);
        //兼容基础url是列表
        if(strpos($filename,".")===false){
            $path = dirname($baseinfo['path']).'/'.$filename.'/'.$srcinfo['path'];
        }else{
            $path = dirname($baseinfo['path']).'/'.$srcinfo['path'];
        }
         
    }
    $rst = array();
    $path_array = explode('/', $path);
    if(!$path_array[0]) {
        $rst[] = '';
    }
    foreach ($path_array AS $key => $dir) {
        if ($dir == '..') {
        if (end($rst) == '..') {
            $rst[] = '..';
        }elseif(!array_pop($rst)) {
            $rst[] = '..';
        }
        }elseif($dir && $dir != '.') {
        $rst[] = $dir;
        }
    }
    if(!end($path_array)) {
        $rst[] = '';
    }
    $url .= implode('/', $rst);
    return str_replace('\\', '/', $url);
    }