The array_uintersect Function

The array_uintersect function computes the intersection of arrays using a callback function for value comparison. It returns an array containing all the values from the first array that are present in all the other arrays. Value comparison is done through a user-defined callback function.

Syntax

array_uintersect(array $array1, array $array2, ..., callable $value_compare_func): array;

Example

Find the intersection of two arrays by comparing their values using a callback function:

<?php
	$array1 = [1, 2, 3, 4, 5];
	$array2 = [2, 4, 6, 8, 10];
	
	$res = array_uintersect($array1, $array2, function($a, $b) {
		if ($a === $b) {
			return 0;
		}
		return ($a > $b) ? 1 : -1;
	});
	
	print_r($res);
?>

Code execution result:

[2, 4]

Example

Comparing string arrays using a custom function:

<?php
	$array1 = ['a', 'b', 'c', 'd', 'e'];
	$array2 = ['b', 'd', 'f', 'h', 'j'];
	
	$res = array_uintersect($array1, $array2, function($a, $b) {
		return strcmp($a, $b);
	});
	
	print_r($res);
?>

Code execution result:

['b', 'd']

The array_uintersect Function

Syntax

Example

Example

See Also