The example #1 can be modified (PHP 7 or higher) by using Spaceship operator (<=>):
<?php
//…
static function comp_func_cr($a, $b)
{
return $a->priv_member <=> $b->priv_member;
}
//…
?>
(PHP 5, PHP 7)
array_udiff_assoc — Computes the difference of arrays with additional index check, compares data by a callback function
Computes the difference of arrays with additional index check, compares data by a callback function.
Notă: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example,
array_udiff_assoc($array1[0], $array2[0], "some_comparison_func");
.
array
The first array.
arrays
Arrays to compare against.
value_compare_func
Funcția de comparare trebuie să întoarcă un întreg mai mic, egal cu sau mai mare decât zero dacă primul argument este considerat respectiv mai mic, egal cu sau mai mare decât al doilea argument. Notă: înainte de PHP 7.0.0 acest întreg trebuia să fie cuprins în domeniul de la -2147483648 până la 2147483647.
array_udiff_assoc() returns an array
containing all the values from array
that are not present in any of the other arguments.
Note that the keys are used in the comparison unlike
array_diff() and array_udiff().
The comparison of arrays' data is performed by using an user-supplied
callback. In this aspect the behaviour is opposite to the behaviour of
array_diff_assoc() which uses internal function for
comparison.
Example #1 array_udiff_assoc() example
<?php
class cr {
private $priv_member;
function cr($val)
{
$this->priv_member = $val;
}
static function comp_func_cr($a, $b)
{
if ($a->priv_member === $b->priv_member) return 0;
return ($a->priv_member > $b->priv_member)? 1:-1;
}
}
$a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
$b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);
$result = array_udiff_assoc($a, $b, array("cr", "comp_func_cr"));
print_r($result);
?>
Exemplul de mai sus va afișa:
Array ( [0.1] => cr Object ( [priv_member:private] => 9 ) [0.5] => cr Object ( [priv_member:private] => 12 ) [0] => cr Object ( [priv_member:private] => 23 ) )
In our example above you see the "1" => new cr(4)
pair is present in both arrays and thus it is not in the output from the
function.
The example #1 can be modified (PHP 7 or higher) by using Spaceship operator (<=>):
<?php
//…
static function comp_func_cr($a, $b)
{
return $a->priv_member <=> $b->priv_member;
}
//…
?>
Difference between array_udiff_assoc() and array_diff_assoc()
- array_udiff_assoc(): Compares the DATA with the user supplied callback function
- array_diff_assoc(): Compares the INDEX with the user supplied callback function