(PECL ds >= 1.0.0)
Ds\Deque::first — Returns the first value in the deque
public Ds\Deque::first ( ) : mixed
Returns the first value in the deque.
This function has no parameters.
The first value in the deque.
UnderflowException if empty.
Example #1 Ds\Deque::first() example
<?php $deque = new \Ds\Deque([1, 2, 3]); var_dump($deque->first()); ?>
The above example will output something similar to:
int(1)
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https://www.php.net/manual/en/ds-deque.first.php