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First use session_start() to open the session, then use session_id() and other session functions.

Supplement: This answer is not comprehensive, please read the comments

session_start returns false to prove that the session call failed. It is recommended to turn on error_reporting (E_ALL) to see if there is an error. In addition, you can use session_status() to check the status of the current session

Did you pass a value to $post['session_id']?
I tried it. If the session_id() function passes null, and then calls the session_start function, a warning error will be reported, which will not affect subsequent code execution..