(PHP 5, PHP 7, PHP 8)
array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function
Compares array
against arrays
and
returns the difference. Unlike array_diff() the array
keys are used in the comparison.
Unlike array_diff_assoc() a user supplied callback function is used for the indices comparison, not internal function.
array
The array to compare from
arrays
Arrays to compare against
key_compare_func
La funzione di confronto deve restituire un intero minore, uguale o maggiore di zero se il primo argomento è considerato essere minore, uguale o maggiore del secondo.
Returns an array containing all the entries from
array
that are not present in any of the other arrays.
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);
?>
Il precedente esempio visualizzerà:
Array ( [b] => brown [c] => blue [0] => red )
The equality of 2 indices is checked by the user supplied callback function.
Nota:
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");
.