Php union:-
($a+$b) = Work as union means if same value then replace left variable to right variable(for keys that exit both array)
ex:-
Php Equality:-
Key value same but order different then print true.Key/Value pair different but order same then print false.
ex:-
Php Identity:-
In this Operators key/pair value same but order different then display false means order does not matter & when order same
ex:-
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