Resource ID space overflow: Better approach to incremental resource id assignment #19253

61
62 file_put_contents("/dev/shm/somefile.txt", $data, LOCK_EX);
63 

PHP Fatal error:  Resource ID space overflow in cache.class.php on line 62

No errors.
I understand that file_put_contents() creates a temporary file resource on each run and probably it's reaching  PHP_INT_MAX to cause this fatal error.
There is only one function get_resource_id() to guess and deal with this issue. Workaround is to keep file handles active during execution.

A)
PHP can handle this by resetting it back to 0 and adding a check to compare it to existing active resources(to avoid conflict) If this is not feasible, I could propose following:
1) In addition to get_resource_id(), we need **get_all_resource_ids**() : Return all active variables with resource ids
2) **resource_id_update**(existing, new) to move active variables to a specific range,
3) **resource_id_range** (0, PHP_INT_MAX) : This would reset back to start when max is reached.

With these extra methods, long running processes can allocate their active resources to a range and let dynamic resource id allocation out of conflict.

B) Another simpler approach could be: Assuming program creates all permanent resources for that run session after a few seconds, program can call a new method: resource_set_dynamic(). This method should record current+1 resource id in memory as "start point" and whenever overflow is due, it can reset it back to start point. This would avoid conflict with permanent resources which would be already created.

C) Checking against existing IDs could be another approach but this may have some impact on performance.

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