PHP array_udiff() Function

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

Note: This function uses a user-defined function to compare the values!

Returns an array containing the entries from array1 that are not present in any of the other arrays

Syntax

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

Example

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

$array1=array("a"=>"Cooper","b"=>"Samuel","c"=>"Lachlan");
$array2=array("a"=>"Lachlan","b"=>"James","e"=>"Lachlan");

$result=array_udiff($array1,$array2,"myfunctiondemo");
print_r($result);

Output

Array ( [a] => Cooper [b] => Samuel )