| Re: question about class getters [message #180842 is a reply to message #180839] |
Thu, 21 March 2013 12:55   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 3/21/2013 5:31 AM, Curtis Dyer wrote:
> Jerry Stuckle <jstucklex(at)attglobal(dot)net> wrote:
>
>> On 3/15/2013 1:53 PM, David Heller wrote:
>>> On Mar 15, 1:11 pm, Jerry Stuckle <jstuck...@attglobal.net>
>>> wrote:
>>>> On 3/15/2013 11:42 AM, David Heller wrote:
>>>>
>>>> > Hello
>>>>
>>>> > I have the following code snippet:
>>>>
>>>> > Class myClass
>>>>
>>>> > {
>>>> > public function makeArray()
>>>> > {
>>>> > $this->my_array = array('Mon', 'Tues', 'Wed', 'Thurs',
>>>> > 'Friday', 'Sat', 'Sun');
>>>> > }
>>>> > pubic function getArray()
>>>> > {
>>>> > return $this->my_array;
>>>> > }
>>>> > }
>>>>
>>>> > and then do the following
>>>>
>>>> > var $MyVar = new myClass();
>>>> > var $mydate = $MyVar->getArray[1];
>>>> > echo $mydate;
>>>> > => Mon
>>>> > will this work? If not how to make it work?
>
> Why not try first and see what happens?
>
> <snip>
>
>>>> Not quite, for a couple of reasons. As Salvatore pointed out,
>>>> getArray() is a function, not a variable, so you need to code
>>>> it as a function. The other problem is you never called
>>>> makeArray() and don't have a constructor, so $my_array doesn't
>>>> exist (also it should be declared as a class variable).
>>>>
>>>> Something like this should works:
>
> <snip code>
>
>>> Even better:
>>>
>>> class MyClass {
>>> private $my_array;
>>>
>>> public function __construct() { // Constructor
>>> $this->my_array = array('Mon', 'Tues', 'Wed', 'Thurs',
>>> 'Friday',
>>> 'Sat', 'Sun');
>
> Just out of curiosity, why is `Friday' the only day of the week
> that's not abbreviated in your list?
>
It's not my list.
>>> }
>>> public function __get($i) {
>>> // if ($i >= 0 && $i < count($this->my_array)) //
>>> Verify index if(array_key_exists($i, $this->my_array)){
>>> // For keys
>>> that are non-numerical
>>> return $this->my_array[$i];}
>>> else
>>> return null; // Out of range or non-existant
>>> }
>>>
>>> }
>>>
>>> I get it now (no pun intended).
>>
>> No, __get is a "magic method" and used to access properties for
>> which you have no special getter method. You need to pass the
>> name of the property you wish.
>
> Magic methods like `__get()' are called when "inaccessible"
> properties or methods are invoked, at which point you may handle
> the call any way you wish. According to the PHP manual[1],
> "inaccessible" methods and properties include those which are not
> defined, so you don't need to specify the names of actual class
> members for `__get()' to work.
>
Yes, I know what magic methods are. But that doesn't mean you can't
call the method directly.
>
> [1]: <http://php.net/__get>
>
> <snip>
>
>> It's also not
>> applicable to passing additional parameters, such as the index
>> you wish.
>
> Yes, the `__get()' magic method expects a string, and moreover, if
> the OP intends to use the class similarly to the code they posted
> initially, it would be a syntax error:
>
> echo $obj->2; /* parse error */
>
> Using a custom getter method as you posted above, IMO, seems
> easiest.
>
echo $obj->'2'; should work (although I haven't tried it).
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================
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