RE: simple class & constructor

["Tommy Pham" <tommyhp2@xxxxxxxxx>]

> -----Original Message-----
> From: David McGlone [mailto:david@xxxxxxxxxxxxx]
> Sent: Tuesday, October 19, 2010 5:32 PM
> To: php-general@xxxxxxxxxxxxx
> Subject: RE:  simple class & constructor
> 
> On Tue, 2010-10-19 at 16:53 -0700, Tommy Pham wrote:
> > > -----Original Message-----
> > > From: David McGlone [mailto:david@xxxxxxxxxxxxx]
> > > Sent: Tuesday, October 19, 2010 4:32 PM
> > > To: php-general@xxxxxxxxxxxxx
> > > Subject: Re:  simple class & constructor
> > >
> > > On Tue, 2010-10-19 at 17:15 -0400, Paul M Foster wrote:
> > > > On Tue, Oct 19, 2010 at 04:12:51PM -0400, David McGlone wrote:
> > > <snip>
> > > > You're trying to "instantiate the class". And the way you're doing
> > > > it here is correct. When you do this, $test becomes an object of
> > > > this class. If you had another function ("member") within the
> > > > class called "myfunction()", you could run it this way (after you
> > > > instantiate the
> > > > class):
> > > >
> > > > $test->myfunction();
> > > >
> > > > >
> > > > > Basically I want to learn how I can (if it's possible with this
> > > > > simple
> > > > > code) is display the output on a different page.
> > > > >
> > > > > I tried putting the line: $test=new simpleConstructer(); on the
> > > > > index page and including the page the class is on, but it causes
> > > > > the index page to go blank.
> > > >
> > > > You've likely got an error you're not seeing. Fix this first. If
> > > > the file your class is in is syntactically correct, and you do
> > > >
> > > > include "simpleConstructerFile.php";
> > > >
> > > > in your index.php file, it should flawlessly include the code.
> > > > Then, in your index.php, you do this:
> > > >
> > > > $test = new simpleConstructer;
> > > >
> > > > you should see the contents of the echo statement appear on the page.
> > > > So you're on the right track. You just need to find the error first.
> > >
> > >
> > > Ah ha! Thank you! Your mention of an error, was spot on. notice
> > > below I misspelled the class name but got the Object name correct.
> > >
> > > Also at first I had the setup like this because it wasn't working
> > > and I thought I was doing it wrong: (this also added to my
> > > confusion)
> > >
> > > myclass.php
> > >
> > > class simpleConstructer {
> > >
> > > function __construct() {
> > >     echo "running the constructor";
> > >    }
> > > }
> > >
> > > index.php
> > > require_once 'myclass.php';
> > > $test = new simpleConstructor();
> > >
> > > But once I fixed the error I put it all back in myclass.php like so:
> > >
> > > myclass.php
> > >
> > > class simpleConstructer {
> > >
> > > function __construct() {
> > >     echo "running the constructor";
> > >    }
> > > }
> > > $test = new simpleConstructor();
> > >
> > >
> > > Now I am wondering what you meant when you said:
> > > >>>If you had another function ("member") within the class called
> > > >>>"myfunction()", you could run it this way (after you instantiate
> > > >>>the
> > > >>> class):
> > >
> > > >>>$test->myfunction();"
> > >
> > > If you don't mind my asking, how would you take the above example
> > > and change it to what you describe above?
> > >
> >
> > class simpleConstructer {
> >
> > function __construct() {
> >      echo "running the constructor";
> >    }
> >
> > function myFunction() {
> >  echo 'this is another function/method within the class simpleConstructor';
> >   }
> > }
> >
> > $test = new simpleConstructor();
> > $test->myfunction();
> 
> Thank you Tommy.
> 
> Now it all comes together and I believe I understand now.
> 
> Does the code immediately after the __construct automatically run, but
> when adding more methods to the class, they need to be called with the
> $name->Object_name? Is my thinking correct?
> 
> --
> Blessings
> David M.
> 

I had a misspell there due to copy and paste :))  ... Anyway, when you instantiate the class, the __construct() is executed.  What you specified inside that __construct() will run automatically when instantiate (create the class object).  Example:

class MyClass()
{
  function __construct() {
    $this->init();
}
  function init() {
  // init your class for whatever you want to do
  }

  function executeTaskOne() {
  // to do one task
  }

  function executeTaskTwo() {
  // to do another task
}

}

There's no limit on how many methods you can have for the  class but it comes down to overall application design for the purpose needed.  There's also something called visibility too.  You might want to check [1] for indepth explaination and samples.

Regards,
Tommy

[1] http://www.php.net/manual/en/language.oop5.php





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