How to Merge Arrays and Remove Duplicates in PHP?

Merge Arrays and Remove Duplicates in PHP

When working with arrays in PHP, it is often necessary to merge two or more arrays into a single array. However, this process can result in duplicate values if the arrays contain overlapping elements. To address this issue, it is desirable to not only merge the arrays but also remove duplicate values from the resulting array.

One way to achieve this is by using the following code:

$array1 = ...; // Array 1
$array2 = ...; // Array 2

$mergedArray = array_unique(array_merge($array1, $array2), SORT_REGULAR);

Here's how this code works:

• The array_merge() function merges the two arrays $array1 and $array2 into a new array.
• The array_unique() function is then applied to the merged array. This function removes duplicate values, leaving only unique elements in the array.
• The SORT_REGULAR flag ensures that the array is sorted using the standard comparison operator (==). This means that objects with the same property values but different references will be considered duplicates and removed.

By utilizing this approach, you can effectively merge two arrays while ensuring that the resulting array contains only unique elements. This can be particularly useful when working with large datasets and combining arrays from multiple sources.

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