Ds\Deque::map
Ds\Deque::map
(PECL ds >= 1.0.0)
Ds\Deque::map — Returns the result of applying a callback to each value.
Description
public Ds\Deque Ds\Deque::map ( callable $callback )
Returns the result of applying a callback
function to each value in the deque.
Parameters
-
callback
-
mixed callback ( mixed $value )
A callable to apply to each value in the deque.
The callable should return what the new value will be in the new deque.
Return Values
The result of applying a callback
to each value in the deque.
Note:
The values of the current instance won't be affected.
Examples
Example #1 Ds\Deque::map() example
<?php $deque = new \Ds\Deque([1, 2, 3]); print_r($deque->map(function($value) { return $value * 2; })); print_r($deque); ?>
The above example will output something similar to:
Ds\Deque Object ( [0] => 2 [1] => 4 [2] => 6 ) Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 )
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https://secure.php.net/manual/en/ds-deque.map.php