How does ibase_wait_event() work in php?

Question

PHP

On table 1 in firebird, there is a trigger of the "after insert" type, which updates the value in table 2, then performs a post_event
A separate php script is launched (in a cycle of 300 seconds, it is planned to create a daemon in the future), which, through ibase_wait_event(), waits for this event, when triggered, it requests the value from table 2. During the script, the trigger (located in the above-mentioned cycle) fires several times, in table 2 the value changes regularly, but each time php receives the value from table 2 corresponding to the first trigger. How to force php to get updated data?