PHP array_udiff_assoc() Function

Example

Compare the keys and values of two arrays (using a built-in function to compare the keys and a user-defined function to compare the values) and return the differences:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","b"=>"blue","c"=>"green");

$result=array_udiff_assoc($a1,$a2,"myfunction");
print_r($result);
?>

Try it Yourself »

Definition and Usage

The array_udiff_assoc() function compares the keys and values of two or more arrays, and returns the differences.

Note: This function uses a built-in function to compare the keys, and a user-defined function to compare the values!

This function compares the keys and values of two (or more) arrays, and return an array that contains the entries from array1 that are not present in array2 or array3, etc.

Syntax

array_udiff_assoc(array1, array2, array3, ..., myfunction)

Parameter Values

Parameter	Description
array1	Required. The array to compare from
array2	Required. An array to compare against
array3,...	Optional. More arrays to compare against
myfunction	Required. A string that define a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument

Technical Details

Return Value:	Returns an array containing the entries from array1 that are not present in any of the other arrays
PHP Version:	5+

❮ PHP Array Reference