PHP array_diff_uassoc() Function


Complete PHP Array Reference

Definition and Usage

The array_diff_uassoc() function compares two or more arrays, checking for differences, before comparing the keys in a user-defined function, then returns an array with the keys and values from the first array, if the function allows it.

Syntax

array_diff_uassoc(array1,array2,array3...,function)

Parameter Description
array1 Required. The first array is the array that the others will be compared with
array2 Required. An array to be compared with the first array
array3 Optional. An array to be compared with the first array
function Required. The name of the user-made function


Tips and Notes

Hint: You can compare the first array with one array, or as many as you like.

Note: Both the key and the value is used in the automatic comparison, then, in the user-defined function, only the keys are being compared.

Example

<?php
function myfunction($v1,$v2)
{
if ($v1===$v2)
  {
  return 0;
  }
if ($v1>$v2)
  {
  return 1;
  }
else
  {
  return -1;
  }
}
$a1=array(0=>"Dog",1=>"Cat",2=>"Horse");
$a2=array(3=>"Dog",1=>"Cat",5=>"Horse");
print_r(array_diff_uassoc($a1,$a2,"myfunction"));
?>

The output of the code above will be:

Array ( [0] => Dog [2] => Horse )


Example

How to assign more than two arrays to the function

<?php function myfunction($v1,$v2)
{
if ($v1===$v2)
  {
  return 0;
  }
if ($v1>$v2)
  {
  return 1;
  }
else
  {
  return -1;
  }
}
$a1=array(0=>"Dog",1=>"Cat",2=>"Horse");
$a2=array(3=>"Dog",1=>"Cat",5=>"Horse");
$a3=array(6=>"Bird",0=>"Dog",5=>"Horse");
print_r(array_diff_uassoc($a1,$a2,$a3,"myfunction"));
?>

The output of the code above will be:

Array ( [2] => Horse )


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