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Date: Wed, 2 Jun 2021 19:15:02 -0400
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To: Larry Garfield <larry@garfieldtech.com>
Subject: Re: [PHP-DEV] Regarding array_shift()/array_unshift()
From: mike@newclarity.net (Mike Schinkel)

> On Jun 2, 2021, at 7:07 PM, Larry Garfield <larry@garfieldtech.com> =
wrote:
>=20
> On Wed, Jun 2, 2021, at 5:59 PM, Mike Schinkel wrote:
>>> On Jun 2, 2021, at 4:25 AM, Jordi Boggiano <j.boggiano@seld.be> =
wrote:
>=20
>>> IMO for unshift() it'd be fine to return a new array, but when =
processing a list of things in a FIFO pattern I often used array_shift() =
to get the first "job" out of the array. If $array->shift() returns a =
new array then how do I access the first item?
>>=20
>> That is a really excellent point, something I did not think to =
consider=20
>> given how rarely I use array_shift(). =20
>>=20
>> But your comment causes me to ponder a number of follow up questions,=20=

>> some of which are tangential.  If any reader feels these tangents are=20=

>> worth discussing please make another email and quote my relevant=20
>> comments so we can have a dedicated thread for each.
>>=20
>> 1.) Given Nikita's position that it would only be viable to offer a=20=

>> syntax that simulates method calling for arrays if the methods=20
>> themselves are immutable can you envision a solution for allowing =20
>> $array->shift() functionality that would address getting both element=20=

>> and shifted array without resorting to by-reference parameters?
>=20
> $list->head() (returns first item)
> $list->tail() (returns all items but the first one)

I assume $list->tail() would still have the O(<n>) problem in PHP, =
though?

-Mike=