PHP array function array_unique() removes duplicate values from the array

This time I will bring youphp arrayfunctionarray_unique() to remove duplicate values in the array, php array function array_unique() to remove duplicate values from the arrayWhat are the precautions? The following is a practical case, let’s take a look.

array_unique() function removes duplicate values from an array and returns the resulting array.
When the values of several array elements are equal, only the first element is retained, and the other elements aredeleted.

array_unique() Definition and Usage
array_unique() function removes duplicate values from an array and returns the resulting array.

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.

Syntax

array_unique(array)

Parameter Description
array Required. Specifies the input array.

Description
array_unique() first sorts the values asstrings, then only retains the first encountered key name for each value, and then ignores all subsequent key name.
This does not mean that the first occurrence of the same value in the unsorted array will be retained.

Tips andComments
Comments: The returned array will retain the key type of the first array element.

"Cat","b"=>"Dog","c"=>"Cat"); print_r(array_unique($a)); ?>

Output:

Array ( [a] => Cat [b] => Dog )

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

array_key_exists() function detailed steps to search array key names

Summary of how to use php array search function

The above is the detailed content of PHP array function array_unique() removes duplicate values from the array. For more information, please follow other related articles on the PHP Chinese website!