Quick Classes Question *SOLVED*

[scottybwoy]

Hi,

Say I have a class called foo.  Foo has a number of functions in it.  Then say I create a new instance of Foo
and pass a parameter to it like so :

$Foofoo = new Foo($bar)

Will the parameter of $bar embed itself into every instance of $bar in the Class so that whenever it is called via other $variables or Functions, it will use $bar when needed?

[Jenk]

Depends on your classes constructor.

(below is PHP5)
[code]<?php

class Foo
{
    protected static $bar;

    public function __construct ($bar)
    {
        self::$bar = $bar;
    }
}
?>[/code]

That will set the static property of the class to $bar - thus every object that utilises that static property will receive the same value.

[code]<?php

class Foo
{
    protected $bar;

    public function __construct ($bar)
    {
        $this->bar = $bar;
    }
}

?>[/code]

That will set the property of the object to $bar, thus only that instance of the object will maintain the value.

[scottybwoy]

So in the bottom one, $bar could change throughout the execution of the script however the static one will remain the same?

[Jenk]

yup. But if any of your objects change the static property at any stage, it will change for all objects that use it as well.

[scottybwoy]

That's great, thanks Jenk for clearing that one up.

[scottybwoy]

One more thing, if I pass a variable to a class like this :

$user_dbi = new DBI($USER_DB_URL);

will user_dbi end up the outcome of $USER_DB_URL being passed through the whole DBI Class?

[Jenk]

no, only the constructor.

[scottybwoy]

OK thanks