session_name

Function name: session_name()

Applicable version: PHP 4, PHP 5, PHP 7

Function Description: The session_name() function is used to get or set the name of the current session.

usage:

1. Get the name of the current session:

    $name = session_name(); echo $name; // 输出当前会话的名称

2. Set the name of the current session:

    session_name("new_session_name");

Example:

1. Get the name of the current session:

    session_start(); $name = session_name(); echo $name; // 输出当前会话的名称，例如：PHPSESSID

2. Set the name of the current session:

    session_name("my_session"); session_start(); $name = session_name(); echo $name; // 输出设置后的会话名称，例如：my_session

Notes:

• Before calling the session_name() function, you need to make sure that the session_start() function has been called to ensure that the session has started.
• Session names can only contain letters, numbers, and underscores and must start with letters.
• Session names are case-sensitive, but in some cases, there may be differences depending on the server's configuration.