What is the significance of the array NOT IDENTICAL operator ( !== ) in PHP?

The array NOT IDENTICAL operator (!==) in PHP is significant because it provides a strict comparison between two arrays. This means it checks not only the values contained in the arrays but also their data types and structure. When using this operator, if two arrays are not the same in terms of both the arrangement of elements and the types of those elements, the result will be true.

For example, if one array contains integer values and the other contains string representations of those values, they will not be considered identical due to the difference in types. Similarly, if two arrays have the same values but in a different order or key structure, they will also return true when compared with the NOT IDENTICAL operator. This makes it a valuable tool for ensuring that two arrays are truly distinct in all defined aspects, providing a more thorough comparison than merely checking the values alone.