On Fri, Apr 13, 2012 at 21:29, Dmitri Snytkine <dsnytk...@ultralogistics.com> wrote: > But why is it possible to assing a new array to a property like that but not > a new instance of some class? > Isn't a new array also requires some type of initialization?
Only static values are allowed, which means that the value requires no code to execute. > > Dmitri Snytkine > Web Developer > Ultra Logistics, Inc. > Phone: (888) 220-4640 x 2097 > Fax: (888) 795-6642 > E-Mail: dsnytk...@ultralogistics.com > Web: www.ultralogistics.com > > "A Top 100 Logistics I.T. Provider in 2011" > > > -----Original Message----- > From: ekne...@gmail.com [mailto:ekne...@gmail.com] On Behalf Of Etienne Kneuss > Sent: Friday, April 13, 2012 3:27 PM > To: Dmitri Snytkine > Cc: PHP Internals > Subject: Re: [PHP-DEV] Ability to assign new object to a class property. > > Hi, > > On Fri, Apr 13, 2012 at 21:19, Dmitri Snytkine > <dsnytk...@ultralogistics.com> wrote: >> I always wondered why can't we do something like this in php >> >> class MyClass{ >> >> private $storage = new ArrayObject(); >> >> public function __construct($v){ >> // whatever >> } >> >> // rest of class >> >> } >> >> Why can't we create a new object and assign it to property like this? >> >> Then when a new instance of MyClass is created the $storage variable is >> automatically assigned a new ArrayObject. >> Somethink like this is valid, possible and commonly used in Java, why not in >> php? >> >> Has anyone already asked for this to be valid syntax in php? > > Sure, people have asked for that. It is definitely possible in theory, > but requires quite some work: > > It requires to add an initialization phase to the class. In other > languages, it is typically done by automatically adding the > initialization code in the constructors. We cannot do that in PHP > because calling parent constructors is not mandatory. > > In other words, in order to allow for this, we need to add an > initialization phase before calling the constructors. > > Allowing this syntax for classes properties would also require adding > an initialization phase, and it is not entirely clear when to run it > (i.e. when the class is first used or when it is loaded). > > Best, > >> >> Dmitri Snytkine >> Web Developer >> Ultra Logistics, Inc. >> Phone: (888) 220-4640 x 2097 >> Fax: (888) 795-6642 >> E-Mail: dsnytk...@ultralogistics.com >> Web: www.ultralogistics.com >> >> "A Top 100 Logistics I.T. Provider in 2011" >> >> >> >> >> -- >> PHP Internals - PHP Runtime Development Mailing List >> To unsubscribe, visit: http://www.php.net/unsub.php >> > > > > -- > Etienne Kneuss > http://www.colder.ch > -- Etienne Kneuss http://www.colder.ch -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
