(PECL ds >= 1.0.0)
Ds\Deque::filter — Creates a new deque using a callable to determine which values to include
public Ds\Deque::filter ([ callable $callback ] ) : Ds\Deque
Creates a new deque using a callable to determine which values to include.
callback
callback ( mixed $value ) : bool
Optional callable which returns true if the value should be included, false otherwise.
If a callback is not provided, only values which are true (see converting to boolean) will be included.
A new deque containing all the values for which either the callback returned true, or all values that convert to true if a callback was not provided.
Example #1 Ds\Deque::filter() example using callback function
<?php
$deque = new \Ds\Deque([1, 2, 3, 4, 5]);
var_dump($deque->filter(function($value) {
return $value % 2 == 0;
}));
?> The above example will output something similar to:
object(Ds\Deque)#3 (2) {
[0]=>
int(2)
[1]=>
int(4)
}
Example #2 Ds\Deque::filter() example without a callback function
<?php $deque = new \Ds\Deque([0, 1, 'a', true, false]); var_dump($deque->filter()); ?>
The above example will output something similar to:
object(Ds\Deque)#2 (3) {
[0]=>
int(1)
[1]=>
string(1) "a"
[2]=>
bool(true)
}
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https://www.php.net/manual/en/ds-deque.filter.php