Php 查找会话数组中是否存在密钥

例如： 身份证号码：1 id 2 身份证号码：3

user_id=3的值，我不需要创建新会话

我想检查我的$\会话中是否存在该id。如果是这样，我不想创建新会话。我做错了什么？谢谢

使用数组[]='hello'；用于将元素添加到数组中，要读取它，不使用[]，而是使用元素的当前索引

    <?php
// i have multiple id and user_name in my SESSION, i don't want to create a new session if 5 exist.
    if($_SESSION['paneluser'][]['user_id'] != $user_id) {
        $_SESSION['paneluser'][] = array('user_id' => $user_id, 'user_name' => $user_name);
        }
    }
    ?>

---

这不是最吸引人的解决方案，但您可以尝试寻找：

   <?php
    // i have multiple id and user_name in my SESSION, i don't want to create a new session if 5 exist.
    if($_SESSION['paneluser']['user_id'] != $user_id) {
        $_SESSION['paneluser'] = array('user_id' => $user_id, 'user_name' => $user_name);
    }
    ?>

为什么继续而不中断？

$found = false;
foreach($_SESSION['paneluser'] as $user) {
    if($user['user_id'] == $user_id) { // look for the user ID in session array
        $found = true; // set your flag if its found
        break; // found what you want, no need to continue the loop
    }
}

if(!$found) { // if you didn't find it
    // create new entry
    $_SESSION['paneluser'][] = array('user_id' => $user_id, 'user_name' => $user_name);
}