array_diff_uassoc
Computes the difference of arrays with additional index check which is performed by a user supplied callback function
Description
array array_diff_uassoc(array $array, array ...$arrays, callable $key_compare_func)
Unlike array_diff_assoc a user supplied callback
function is used for the indices comparison, not internal function.
Parameters
-
array
-
The array to compare from
-
arrays
-
Arrays to compare against
-
key_compare_func
-
The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
int callback(mixed $a, mixed $b)
Caution
Returning non-integer values from the comparison
function, such as float, will result in an internal cast to
int of the callback's return value. So values such as
0.99 and 0.1 will both be cast to an
integer value of 0, which will compare such values as equal.
Return Values
Returns an array containing all the entries from
array that are not present in any of the other arrays.
Examples
Example #1 array_diff_uassoc example
In this example the "a" => "green"
pair is present in both arrays and thus it is not in the output from the
function. Unlike this, the pair 0 => "red"
is in the output because the key of "red" is
automatically assigned to 0 in the first array,
whereas it is assigned to 1 in the second array as the
key 0 is already taken by yellow.
<?php
function key_compare_func($a, $b)
{
return $a <=> $b;
}
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>
The above example will output:
Array
(
[b] => brown
[c] => blue
[0] => red
)
The equality of 2 indices is checked by the user supplied callback function.
Notes
Note:
This function only checks one dimension of an n-dimensional
array. It is possible to check deeper dimensions by using, for example,
array_diff_uassoc($array1[0], $array2[0], "key_compare_func");.
See Also
- array_diff
- array_diff_assoc
- array_udiff
- array_udiff_assoc
- array_udiff_uassoc
- array_intersect
- array_intersect_assoc
- array_uintersect
- array_uintersect_assoc
- array_uintersect_uassoc