Web Reference: The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored. Array operators are operators that are used on arrays. Who would have guessed? The first operator that we'll look at is the + operator. In PHP, array operators are used to compare and combine arrays. These operators are useful for a variety of tasks, like merging two arrays, testing if two arrays are equal and finding whether they have the same order and data types.
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