How can PHP functions be utilized to efficiently manage user lists in a chat application?

To efficiently manage user lists in a chat application using PHP functions, we can create functions to add users to the list, remove users from the list, and retrieve the list of users. By encapsulating these operations in functions, we can easily maintain and manipulate the user list throughout the chat application. 

// Function to add a user to the list
function addUserToList($user, &$userList) {
    $userList[] = $user;
}

// Function to remove a user from the list
function removeUserFromList($user, &$userList) {
    $key = array_search($user, $userList);
    if ($key !== false) {
        unset($userList[$key]);
    }
}

// Function to retrieve the list of users
function getUsersList($userList) {
    return $userList;
}

// Example usage
$userList = [];
addUserToList("User1", $userList);
addUserToList("User2", $userList);
removeUserFromList("User1", $userList);
$users = getUsersList($userList);
print_r($users);

Keywords

PHP functions user lists chat application efficiency management

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