PHP array_udiff_uassoc() Function

Last Updated : 17 Mar 2025

The array_udiff_uassoc( ) function is an inbuilt function of PHP. The array_udiff_uassoc( ) function compares two or more arrays in two user-made functions, and returns an array containing the elements from the first array. This function was introduced in PHP 5.0.

Syntax

Parameters

Parameter	Description	Required/Optional
array1	Array to compare from.	compulsory
array2	Array to compare against.	compulsory
array3	More arrays to compare against.	Optional
Value_compare_function	User-defined function to compare the array values.	compulsory
Key_compare_function	User-defined function to compare the array keys.	compulsory

Return Values

The array_udiff_uassoc( ) function returns an array containing all the values from array1 that are not present in any of the other arguments.

Example 1

Output:

Array
(
    [c] => vivo
)

Example 2

Output:

Array
(
    [c] =>virat
)

Example 3

Output:

Array
(
    [c] =>ndtv
)

Example 4

Output:

Array
(
    [m] => C 
    [n] => Java
    [o] => C#
    [y] => python
)

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