(PECL ds >= 1.0.0)
Ds\Map::diff — Creates a new map using keys that aren't in another map
public Ds\Map::diff ( Ds\Map $map ) : Ds\Map
Returns the result of removing all keys from the current instance that are present in a given map.
A \ B = {x ∈ A | x ∉ B}
map
The map containing the keys to exclude in the resulting map.
The result of removing all keys from the current instance that are present in a given map.
Example #1 Ds\Map::diff() example
<?php $a = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]); $b = new \Ds\Map(["b" => 4, "c" => 5, "d" => 6]); var_dump($a->diff($b)); ?>
The above example will output something similar to:
object(Ds\Map)#3 (1) {
[0]=>
object(Ds\Pair)#4 (2) {
["key"]=>
string(1) "a"
["value"]=>
int(1)
}
}
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https://www.php.net/manual/en/ds-map.diff.php