PHP判断数组内容是否都为一样的值

<code><span>//比较是不是所有的二比学生都投的优秀</span><span>$shabi</span>=<span>false</span>;
        <span>foreach</span>(<span>$err</span><span>as</span><span>$err_k</span> => <span>$err_v</span>){
            <span>if</span>(<span>$err_v</span>==<span>'1'</span>){
                <span>$shabi</span>=<span>true</span>;
            }<span>else</span>{
                <span>$shabi</span>=<span>false</span>;
                <span>break</span>;
            }
        }
        <span>if</span>(<span>$shabi</span>==<span>true</span>){
            <span>echo</span><span>"不能都是优秀哦"</span>;
            }</code>