(PHP 4, PHP 5, PHP 7)
session_encode — Encodes the current session data as a session encoded string
session_encode ( ) : string|false
session_encode() returns a serialized string of the contents of the current session data stored in the $_SESSION superglobal.
By default, the serialization method used is internal to PHP, and is not the same as serialize(). The serialization method can be set using session.serialize_handler.
Returns the contents of the current session encoded, or false on failure.
Must call session_start() before using session_encode().
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https://www.php.net/manual/en/function.session-encode.php