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Re: ArrayAccess interface, Traversable interface and foreach [message #185996 is a reply to message #185989]

Tue, 27 May 2014 18:59

Adam Harvey
Messages: 25
Registered: September 2010

Karma:

Junior Member

On Sat, 24 May 2014 12:05:02 +0200, Christoph Michael Becker wrote:

> kurtk(at)pobox(dot)com wrote:
>
>> This seems like an oversight in the documentation--unless I am missing
>> something?
>
> You can use any object (whether it is an instance of a class that
> implements Traversable or not) in a foreach loop, see
> <http://www.php.net/manual/en/control-structures.foreach.php>.

Yep, this is why objects that implement ArrayAccess still work with
foreach without implementing Traversable.

ArrayAccess and Traversable are technically different things: Traversable
provides a way to control iteration, whereas ArrayAccess is only for
array-style dereferencing via $object['key']. In practice, classes that
need to imitate arrays will need to implement both (probably by extending
a class such as ArrayObject that implements both interfaces).

Adam

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[Message index]

		ArrayAccess interface, Traversable interface and foreach By: kurtk(at)pobox(dot)com on Fri, 23 May 2014 18:22
		Re: ArrayAccess interface, Traversable interface and foreach By: Jerry Stuckle on Fri, 23 May 2014 20:35
		Re: ArrayAccess interface, Traversable interface and foreach By: Christoph Michael Bec on Sat, 24 May 2014 10:05
		Re: ArrayAccess interface, Traversable interface and foreach By: Jerry Stuckle on Sat, 24 May 2014 11:09
		Re: ArrayAccess interface, Traversable interface and foreach By: Christoph Michael Bec on Sat, 24 May 2014 12:37
		Re: ArrayAccess interface, Traversable interface and foreach By: Adam Harvey on Tue, 27 May 2014 18:59
		Re: ArrayAccess interface, Traversable interface and foreach By: kurtk(at)pobox(dot)com on Mon, 02 June 2014 14:15

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