[PHP-NOTES] note 130188 added to functions.first_class_callable_syntax

Also note that closures are not serializable. So if you are storing a reference to a callback in a variable that will be serialized for caching or any other purpose, do not switch to this syntax or your serialization will break.
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Manual Page -- https://php.net/manual/en/functions.first_class_callable_syntax.php
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