How to Merge Arrays and Eliminate Duplicates in PHP?

Merging Arrays and Eliminating Duplicates in PHP

In PHP, you may encounter the need to merge two or more arrays while ensuring that duplicate values are removed. This article addresses this issue.

To merge two arrays and remove duplicate entries, you can utilize the array_merge() and array_unique() functions. Here's how it works:

1. Merging Arrays: Use array_merge() to combine the two input arrays into a single array. For example:

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

2. Removing Duplicates: After merging the arrays, employ array_unique() on the merged array to eliminate duplicate values. array_unique() accepts the merged array as an input and returns an array with unique values.

To perform both actions in one step, you can use the following syntax:

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

3. Customization: The SORT_REGULAR flag in the array_unique() function ensures that values are compared using traditional comparison rules. If you need to compare values using a custom sorting method, you can specify a comparator function as the second parameter of array_unique().

By following these steps, you can effectively merge two arrays and remove duplicate values, resulting in a unique and consolidated array.

The above is the detailed content of How to Merge Arrays and Eliminate Duplicates in PHP?. For more information, please follow other related articles on the PHP Chinese website!