Ds\Set::add

(PECL ds >= 1.0.0)

Ds\Set::add — Adds values to the set

说明

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

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

注意:
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.

警告

All comparisons are strict (type and value).

参数

values: Values to add to the set.

返回值

没有返回值。

示例

示例 #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);
?>

以上示例的输出类似于：

object(Ds\Set)#1 (5) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  string(1) "1"
  [4]=>
  bool(true)
}

示例 #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);
?>

以上示例的输出类似于：

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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