How to merge arrays without duplicates in php

This article introduces the relevant knowledge of "how php does not go to heavy merge arrays". In the actual case operation process, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

Operating environment of this tutorial: Windows 7 system, PHP 7.1 version, DELL G3 computer

Generally, when we perform array merge operations, we will use the "+" operator or the array_merge() function to achieve this. However, when two or more array elements have the same key name, both methods overwrite the other elements with the last element (i.e., de-duplicate, leaving only one element).

How do you want to hit the array merge operation, and do not go to the heavy, retain so duplicate key?

PHP provides a function called array_merge_recursive(). This function does not override keys when dealing with two or more array elements with the same key name, but recursively combines multiple values with the same key name into an array.

Syntax: array_merge_recursive(array1, array2, array3...)

Let's take a look at it in detail through the following example:

Output:

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