Php blocking browser program data is still increasing

There is still a strange situation today when php closes the browser program data. a program that inserts data into the database closes the php program, and there are still records in the database. The php program does not use the ignore_user_abort function. Is it because mysql has a cache function, that is, there are too many query statements that are too late to be executed and put in the queue? even if php is disabled, php will still increase the number of closed browser program data?
Today, a strange situation occurs: a program that inserts data into the database closes the php program, and there are still records in the database.
The php program does not use the ignore_user_abort function.
Does mysql still execute SQL statements in the queue even if php is disabled because it has too many query statements and cannot be executed?

------ Solution --------------------
Php and mysql are two independent systems that do not interfere with each other.
Whenever php sends a request to mysql, mysql will respond to the request and return data.