PHP Array Addition

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Problem

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.

Options

exec is denied

rejudge feature is enabled

now post-mortem time, all source codes will be revealed

Sample input:_

[] + [4, 2, 1, 0, 3, 0, 6]
[3, 9, 1, 6] + [4, 1, 0, 1, 0, 4, 8]
[] + [6]
[2] + []
[5, 0, 3] + []
[8, 9, 4, 7, 6, 1] + []
[9, 9, 6, 6, 2] + [1, 6, 4, 1, 9, 3, 2, 4]
[] + [3, 1, 0, 4, 7, 6]
[6, 1, 0, 5, 7, 2, 3] + [2]
[5, 1, 5, 3, 6, 6] + [1, 1, 5, 1, 8, 7, 5, 6]
[8, 5, 6] + [0, 8, 2]
[7, 1, 7, 2, 4, 9, 2, 2, 8, 0] + [8, 2, 6, 1, 0, 4, 6]
[2, 5, 2, 1, 2, 7, 3, 6, 2] + [0, 5, 0]
[5] + [2, 8, 0, 2, 8, 5, 3, 0, 4, 7]
[] + []
[0, 6, 9, 0, 3, 0, 0, 3, 0] + [0, 2]
[0, 3, 1, 0, 0, 4, 0, 0, 0, 3] + [0, 5, 2, 3, 0, 4, 7, 3]
[9, 0, 7, 6, 4, 9, 4, 6, 1, 5] + [3, 3]
[8] + [7, 4, 2, 7, 9, 2, 1, 3]
[5, 9, 9, 0, 2, 3, 3, 0, 2] + [2]
[8, 1, 8, 1, 4, 7, 5, 2, 2, 3] + []
[4, 8, 2, 5, 1, 0, 4, 1] + [1, 1, 4, 6, 5, 4, 5, 5, 0]
[9, 0, 0] + [1, 7, 5]
[5, 2, 8] + [5, 2, 5, 5, 7, 7, 1, 6, 2]
[6, 2, 3, 0, 4, 4, 9] + []

Sample output:

[4, 2, 1, 0, 3, 0, 6]
[3, 9, 1, 6, 0, 4, 8]
[6]
[2]
[5, 0, 3]
[8, 9, 4, 7, 6, 1]
[9, 9, 6, 6, 2, 3, 2, 4]
[3, 1, 0, 4, 7, 6]
[6, 1, 0, 5, 7, 2, 3]
[5, 1, 5, 3, 6, 6, 5, 6]
[8, 5, 6]
[7, 1, 7, 2, 4, 9, 2, 2, 8, 0]
[2, 5, 2, 1, 2, 7, 3, 6, 2]
[5, 8, 0, 2, 8, 5, 3, 0, 4, 7]
[]
[0, 6, 9, 0, 3, 0, 0, 3, 0]
[0, 3, 1, 0, 0, 4, 0, 0, 0, 3]
[9, 0, 7, 6, 4, 9, 4, 6, 1, 5]
[8, 4, 2, 7, 9, 2, 1, 3]
[5, 9, 9, 0, 2, 3, 3, 0, 2]
[8, 1, 8, 1, 4, 7, 5, 2, 2, 3]
[4, 8, 2, 5, 1, 0, 4, 1, 0]
[9, 0, 0]
[5, 2, 8, 5, 7, 7, 1, 6, 2]
[6, 2, 3, 0, 4, 4, 9]

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