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PHP array_udiff() Function

PHP Array Reference PHP Array Reference

Example

Compare the values of two arrays (use 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"=>"blue","b"=>"black","e"=>"blue");

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

Run example »

Definition and Usage

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

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

This function compares the 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(array1,array2,array3...,myfunction)

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: 5.1.0+


More Examples

Example 1

Compare the values of three arrays (use 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","yellow");
$a2=array("A"=>"red","b"=>"GREEN","yellow","black");
$a3=array("a"=>"green","b"=>"red","yellow","black");

$result=array_udiff($a1,$a2,$a3,"myfunction");
print_r($result);

?>

Run example »


PHP Array Reference PHP Array Reference

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