PHP array_udiff() Function

Last Updated : 17 Mar 2025

The array_udiff( ) function is an inbuilt function of PHP. The array_udiff( ) function is used to compute the difference of given arrays by using a callback function for data comparison. This function was introduced in PHP 5.1.0.

Syntax

Parameters

Parameter	Description	Is compulsory
array1	The first Array.	compulsory
array2	Array to compare against.	compulsory
array3,...	More arrays to compare against.	Optional
Value_compare_function	A string that define a callable comparison function.	compulsory

Return Values

The array_udiff( ) function returns an array containing the entries from array1 that are not present in any of the other arrays.

Important note:

User-defined function must returns an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument.

Example 1

Output:

Array
(
    [a] => A
    [b] => HTML
    [c] =>javatpoint
)

Example 2

Output:

Array
(
    [c] => ruby
)

Example 3

Output:

Array
(
    [d] => Java
    [r] => HTML
)

Example 4

Output:

Array
(
    [a] =>bengaluru
    [b] =>chennai
)

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