PHP的foreach

<?php    $url = array("百度"=>"www.baidu.com",                    "谷歌"=>"www.google.com",                    "必应"=>"www.bing.com");    foreach($url as $link){        echo $link."<br><br>";    }        $flag = "www.baidu.com";    $bool_flag = false;        foreach($url as $link){        if($flag == $link)        {            echo "Yes,the array contain Baidu<br>";        }                if($link == "www.google.com")        {            $bool_flag = true;        }    }        if($bool_flag == true)    {        echo "contain google.com<br>";    }else{        echo "doesn't contain the google.com<br>";    }?>