[PHP] 透過 $_SERVER['HTTP_USER_AGENT'] 來判斷使用者是否使用IE

資料來源：PHP官網


<?php
function using_ie(){
    $u_agent = $_SERVER['HTTP_USER_AGENT'];
    $ub = False;
    if(preg_match('/MSIE/i',$u_agent))
    {
        $ub = True;
    }
    return $ub;
}

function ie_box() {
    if (using_ie()) {
        ?>
        <div class="iebox">
            This page is not designed for Intenet Explorer.  If you want to see this webpage as intended, please use a standards compliant browser, such as <a href="http://www.google.com/chrome">Google Chrome</a>.
        </div>
        <?php
    return;
    }
}
?>