PHP合併數組後如何刪除重複項？

Merging and Removing Duplicates in Arrays in PHP

Merging two arrays can be a common task in PHP. However, what if you want to remove duplicate values after merging? This is exactly what the following question addresses.

Question:

The user has two arrays with objects as values. They want to merge these arrays and remove any duplicate values using array_merge(). However, the array_merge() function doesn't remove duplicates. How can this be achieved?

Answer:

To merge two arrays and remove duplicate values, you can use the following PHP function:

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

Here's how it works:

1. array_merge(): This function takes two arrays as arguments and merges them into a single array. However, it preserves duplicate values.
2. array_unique(): This function takes an array as an argument and returns a new array with duplicate values removed. It uses strict comparison by default (SORT_REGULAR).

By combining these two functions, you can effectively merge two arrays and eliminate any duplicate values. The SORT_REGULAR argument in array_unique() ensures that comparisons are made based on values, rather than by reference.

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