添加两个关联数组的最佳方法是什么，这样就不会重复写入重复值：`+`或`array_merge`？ [重复]

Question

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• + operator for array in PHP? 8 answers

What is the best way to add two associative arrays such that duplicate values are not over written : + or array_ merge ?

I was pretty sure that using + operator I can add two associative arrays such that duplicate values are not over written but this Answer is saying something different and so am not sure if it is really true.

I would really appreciate if you can share some lights on how can we add two associative arrays such that duplicate values are not over written.

Appreciate your time and responses.

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Answer 1

array_merge will combine the arrays such that no values are lost, provided the arrays have contiguous numeric keys. If you start mixing string keys, values with the same keys will be overwritten. If you treat your arrays as arrays and not maps, array_merge will do what you want.