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(PHP 5 >= 5.4.0, PHP 7, PHP 8)
session_status — 返回当前会话状态
此函数没有参数。
PHP_SESSION_DISABLED 会话是被禁用的。
PHP_SESSION_NONE 会话是启用的，但不存在当前会话。
PHP_SESSION_ACTIVE 会话是启用的，而且存在当前会话。
