$arraysAreEqual = ($a == $b);     // TRUE if $a and $b have the same key/value pairs.
$arraysAreEqual = ($a === $b);     // TRUE if $a and $b have the same key/value pairs 
                                //        in the same order and of the same types.
$arraysAreEqual = (array_diff($a, $b)==[] && array_diff($a, $b) == []);