(PHP 5 >= 5.3.0, PHP 7)
gc_enabled — Returns status of the circular reference collector
gc_enabled ( ) : bool
Returns status of the circular reference collector.
This function has no parameters.
Returns true if the garbage collector is enabled, false otherwise.
Example #1 A gc_enabled() example
<?php if(gc_enabled()) gc_collect_cycles(); ?>
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https://www.php.net/manual/en/function.gc-enabled.php