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PHP array_diff_uassoc() Function | Rookie Tutorial

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PHP array_diff_uassoc() Function

array_diff_uassoc() function compares the keys and values of two (or more) arrays and returns the difference.

Note: This function uses a user-defined callback function to compare the keys (the keys are used for comparison).

This function compares the keys and values of two (or more) arrays and returns an array containing all entries from array1 that are not present in any of the other arrays.

Syntax

array_diff_uassoc(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 defines a callable comparison function. The comparison function must return an integer < 0, = 0, or > 0 if the first argument is respectively less than, equal to, or greater than the second.

Technical Details

Return Value:	Returns an array containing all entries from array1 that are not present in any of the other arrays.
PHP Version:	5.0+

Example 1

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

<?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"=>"green","c"=>"blue");

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

Run Example »

Example 2

Compare three arrays, using a user-defined function to compare the keys:

<?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"=>"green","d"=>"blue");
$a3=array("e"=>"yellow","a"=>"red","d"=>"blue");

$result=array_diff_uassoc($a1,$a2,$a3,"myfunction");
print_r($result);
?>

Run Example »

Example 3

Using an anonymous function (available in PHP 5.3+):

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

$result=array_diff_uassoc($a1,$a2, function($a,$b) {
    if ($a===$b) return 0;
    return ($a>$b)?1:-1;
});
print_r($result);
?>

Run Example »

```