如果白名单 IP 不存在，PHP 检查 cookie(得到T_ELSEIF解析错误） - PHP check for cookie if whitelisted IP does not exist (getting T_ELSEIF parse error)

PHP check for cookie if whitelisted IP does not exist (getting T_ELSEIF parse error)

我根本不是PHP开发人员，这是一个主题提供的脚本，用于限制对白名单IP地址的访问。我希望修改它，以便如果存在白名单 IP，它会加载 WordPress（就像现在一样），否则如果数组中不存在该 IP，它会检查 cookie。如果 cookie 存在（passedSecurityTT），则显示 WordPress，最后，如果两者都不存在 - 重定向到/login.php。

    <?php
    $whitelist = array('111.222.333.444', '111.222.333.445');
    if (in_array($_SERVER['REMOTE_ADDR'], $whitelist)) {
    define('WP_USE_THEMES', true);
    /** Loads the WordPress Environment and Template */
    require('./wp-blog-header.php');
    } else {
        //Action for all other IP Addresses
        echo 'You are not authorized here.'; 
        echo "<br />IP Address: ".$_SERVER['REMOTE_ADDR'];
        exit;
    }
elseif (!isset($_COOKIE['passedSecurityTT'])) {
    define('WP_USE_THEMES', true);
    /** Loads the WordPress Environment and Template */
    require('./wp-blog-header.php');
    } else {
        //Action for all other IP Addresses
        echo 'You are not authorized here.'; 
        echo "<br />IP Address: ".$_SERVER['REMOTE_ADDR'];
        exit;
    }

else {
header('Location: /login.php');
}

但是我在第 16 行收到错误：解析错误：语法错误，第 16 行/home/public_html/index.php 中的意外T_ELSEIF

谁能帮忙？还认为我应该以某种方式将其包装在一个函数中，因为它是重复的......

define('WP_USE_THEMES', true);
    /** Loads the WordPress Environment and Template */
    require('./wp-blog-header.php');
    } else {
        //Action for all other IP Addresses
        echo 'You are not authorized here.'; 
        echo "<br />IP Address: ".$_SERVER['REMOTE_ADDR'];
        exit;
    }

<?php
$whitelist = array('111.222.333.444', '111.222.333.445');
// check if remote address is in whitelist OR if cookie exists(this is not the best security practice! @FIXME
if (in_array($_SERVER['REMOTE_ADDR'], $whitelist) || isset($_COOKIE['passedSecurityTT'])) ) {
    define('WP_USE_THEMES', true);
    /** Loads the WordPress Environment and Template */
    require('./wp-blog-header.php');
} else {
    header('Location: /login.php');
}

else后不能有elseif：

<?php
$whitelist = array('111.222.333.444', '111.222.333.445');
if (in_array($_SERVER['REMOTE_ADDR'], $whitelist)) {
    define('WP_USE_THEMES', true);
     /** Loads the WordPress Environment and Template */
    require('./wp-blog-header.php');
} else {
    //Action for all other IP Addresses
    echo 'You are not authorized here.'; 
    echo "<br />IP Address: ".$_SERVER['REMOTE_ADDR'];   
    header('Location: /login.php');
    exit;
}