Ds\Set::add
(PECL ds >= 1.0.0)
Ds\Set::add — Adds values to the set
Descrizione
Adds all given values to the set that haven't already been added.
Nota:
Values of type object are supported. If an object implements Ds\Hashable, equality will be determined by the object's
equalsfunction. If an object does not implement Ds\Hashable, objects must be references to the same instance to be considered equal.
All comparisons are strict (type and value).
Elenco dei parametri
-
values -
Values to add to the set.
Valori restituiti
Nessun valore viene restituito.
Esempi
Example #1 Ds\Set::add() example using integers
<?php
$set = new \Ds\Set();
$set->add(1);
$set->add(1);
$set->add(2);
$set->add(3);
// Strict comparison would not treat these the same as int(1)
$set->add("1");
$set->add(true);
var_dump($set);
?>Il precedente esempio visualizzerà qualcosa simile a:
object(Ds\Set)#1 (5) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[3]=>
string(1) "1"
[4]=>
bool(true)
}
Example #2 Ds\Set::add() example using objects
<?php
class HashableObject implements \Ds\Hashable
{
/**
* An arbitrary value to use as the hash value. Does not define equality.
*/
private $value;
public function __construct($value)
{
$this->value = $value;
}
public function hash()
{
return $this->value;
}
public function equals($obj): bool
{
return $this->value === $obj->value;
}
}
$set = new \Ds\Set();
$obj = new \ArrayIterator([]);
// Adding the same instance multiple times will only add the first.
$set->add($obj);
$set->add($obj);
// Adding multiple instances of the same object will add them all.
$set->add(new \stdClass());
$set->add(new \stdClass());
// Adding multiple instances of equal hashable objects will only add the first.
$set->add(new \HashableObject(1));
$set->add(new \HashableObject(1));
$set->add(new \HashableObject(2));
$set->add(new \HashableObject(2));
var_dump($set);
?>Il precedente esempio visualizzerà qualcosa simile a:
object(Ds\Set)#1 (5) {
[0]=>
object(ArrayIterator)#2 (1) {
["storage":"ArrayIterator":private]=>
array(0) {
}
}
[1]=>
object(stdClass)#3 (0) {
}
[2]=>
object(stdClass)#4 (0) {
}
[3]=>
object(HashableObject)#5 (1) {
["value":"HashableObject":private]=>
int(1)
}
[4]=>
object(HashableObject)#6 (1) {
["value":"HashableObject":private]=>
int(2)
}
}
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