PHP array_udiff() Function Usage and Example

PHP Array Function Manual

array_udiff — Calculate the difference set of the array using a callback function to compare data

Syntax

array_udiff($array1, $array2　[, $array3　..., $data_compare_func]);

Definition and Usage

It uses a callback function for data comparison to calculate the difference of the array and returns an array, including array1all values that do not exist in all other parameters. Unlike array_diff(), the former uses built-in functions for data comparison.

Parameter

Return Value

It returns an array, returning array1 does not appear in other parameters.

Online Example

<?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);
?>

Output Result:

Array
(
　　　　[a] => red
　　　　[b] => green
)

　 　PHP Array Function Manual