Ds\Set::add

(PECL ds >= 1.0.0)

Ds\Set::add — Adds values to the set

Descrierea

public Ds\Set::add ([ mixed $...values ] ) : void

Adds all given values to the set that haven't already been added.

Notă:
Values of type object are supported. If an object implements Ds\Hashable, equality will be determined by the object's equals function. If an object does not implement Ds\Hashable, objects must be references to the same instance to be considered equal.

Precauţie

All comparisons are strict (type and value).

Parametri

values: Values to add to the set.

Valorile întoarse

Nu este întoarsă nici o valoare.

Exemple

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);
?>

Exemplul de mai sus va afișa ceva similar cu:

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);
?>

Exemplul de mai sus va afișa ceva similar cu:

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)
  }
}