How to auto empty table on specified time - php

Question

I need to remove all records in my table when time is 23.59, I have the following query:
function delChat() {
$date = date('H:i');
$this->db->where(dimasukkan, '23:59');
$this->db->delete('chat');
}
but nothing happens

Answer 1

Please be aware that I don't know PHP, so I can't provide working code. However, I'll try to help out.
First, your question is ambiguous. Do you mean that you want to remove all records from the table every day when it is 23:59 h, or do you mean that you must remove every record whose timestamp is 23:59 h?
If you want to empty the table every day when it is 23:59 h, a cron job would be the right thing (as some comments already propose).
The cron job could be used on Linux / Unix systems; an alternative to that would be at. Under Windows, you could use the task scheduler for regularly running your job.
In every case, please be aware that you actually can't predict how long the operation will take. Possibly it will still run when it is already 00:00 h, or even 00:01 h the next day, which will eventually get you into trouble.
If you want to delete every row whose timestamp or date column is 23:59 h, your code has some problems:
Your where statement is wrong. You are comparing a normal variable to a constant here. I have no clue what PHP / MySQL are doing in such cases, but it certainly is not what you expect. If you want to compare e.g. a date column to that constant, you would have to it that way: ... where('date', '23:59').
Almost certainly, your date column or timestamp does not contain the date / time in the format needed. Hence, if you want to compare hour:minute to your date or timestamp column, you would first have to extract the hour and the minute from it and concatenate that to the format needed (or perhaps MySQL already provides an appropriate function for that), and then compare the result to your string constant.