How to remove duplicate values ​​in php

In PHP, you can use the "array_unique()" function to remove duplicate values. The function of this function is that when the values ​​​​of several array elements are equal, only the first element is retained, and the other elements are deleted. The syntax is "array_unique(array)".

php remove duplicate values

array_unique() function definition and usage

## The #array_unique() function is used to remove duplicate values ​​from an array. If two or more array values ​​are the same, only the first value is retained and the other values ​​are removed.

Note: The retained array will retain the key type of the first array item.

Syntax

Parameters

array required. Specifies an array.

sortingtype Optional. Specifies the sorting type. Possible values:

SORT_STRING - Default. Treat each item as a string.

SORT_REGULAR - Sort each item in regular order (Standard ASCII, does not change type).

SORT_NUMERIC - Treat each item as a number.

SORT_LOCALE_STRING - Treat each item as a string, based on the current locale (can be changed via setlocale()).

Example:

When the values ​​of several array elements are equal, only the first element is retained, and the other elements are deleted.

The key names in the returned array remain unchanged.

Output:

Recommended: "

PHP Tutorial"

The above is the detailed content of How to remove duplicate values ​​in php. For more information, please follow other related articles on the PHP Chinese website!