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PHP array_udiff_uassoc() Function

PHP Array Reference Complete PHP Array Reference

Definition and Usage

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, if the user-made functions allow it. The first user-made function compares array keys, and the second compares array values, and both returns a numeric value, a positive number (1) if the returned array should contain this element, and 0, or a negative number (-1), if not.

Syntax

array_udiff_uassoc(array1,array2,array3...,function1,function2)

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
function1 Required. The name of the user-made function that compares the array keys
function2 Required. The name of the user-made function that compares the array values

Tips and Notes

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

Note: For comparison, the key is used in the first function and the value is used in the second. They are both user-made functions.

Example

<?php
function myfunction_key($v1,$v2)
{
if ($v1===$v2)
  {
  return 0;
  }
return 1;
}

function myfunction_value($v1,$v2)
{
if ($v1===$v2)
  {
  return 0;
  }
return 1;
}
$a1=array("a"=>"Cat","b"=>"Dog","c"=>"Horse");
$a2=array("a"=>"Cat","b"=>"Dog","c"=>"Fish");
print_r(array_udiff_uassoc($a1,$a2,"myfunction_key","myfunction_value"));
?>

The output of the code above will be:

Array ( [c] => Horse )

PHP Array Reference Complete PHP Array Reference
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