[SOLVED] Passing values to constuctor in Object oriented?

[snowman15]

Hey,

When I make an object, can i use some sort of parameters to pass values to the constructor?

If not, what can I do to "Set value X when its created" (value X= member variable)

 

 

code for object class:

<?php 
class UnitCounter
{//start class
protected $units = 0;
protected $weightPerUnit = 1.0;
function __construct($unit,$weight)
{
$this-> $units = $unit;
$this-> $weight = $weight;
}
function add($num = 1)  // Add $num to the total number of units
{
     return  $this->units = $this->units + $num;
}
function totalWeight()  // Calculate the total weight
  {
  return $this->units * $this->weightPerUnit;
}
}//end class
?>

 

 

I have parameters set up for the constuctor but I dont think thats right.

Also in the php statement i want something like this:

$bottles= new UnitCounter(1,3);

 

 

Or is the only way to make the object and then call a function to change the member variables $units and $weightPerUnit

[Zane]

I don't quite follow your question

but it all looks correct to me

 

 

only advice I have so far is ... wouldn't hurt to change this

return  $this->units = $this->units + $num;

to this

return  $this->units += $num;

[snowman15]

Thanks, So using that code,

Does this look good?

 

$bottles= new UnitCounter(24,0);
  $books= new UnitCounter(10,1.5);
  echo $bottles->add(3);
  echo $books->totalWeight();

[pocobueno1388]

<?php

function __construct($unit,$weight)
{
$this-> $units = $unit;
$this-> $weight = $weight;
}

?>

 

Should be

 

<?php

function __construct($unit,$weight)
{
   $this->units = $unit;
   $this->weight = $weight;
}

?>

[snowman15]

Something is still wrong  ???

 

 

php file:

<?php
include('exam1p3.inc.php');
  $bottles= new UnitCounter(24,0);
  $books= new UnitCounter(10,1.5);
  $bottles->add(3);
  echo $bottles->$units."<br />";
  echo $books->totalWeight();
?>

 

included file code:

<?php 
class UnitCounter
{//start class
protected $units = 0;
protected $weightPerUnit = 1.0;
function __construct($unit,$weight)
{
   $this->units = $unit;
   $this->weight = $weight;
}
function add($num = 1)  // Add $num to the total number of units
{
     $this->units = $this->units + $num;
   
}

function totalWeight()  // Calculate the total weight
  {
  return $this->units * $this->weightPerUnit;
}
}//end class
?>

 

I need it to display the units of bottles and the totalweight of books.

Thanks in advance!

[Zane]

you won't be able to echo units and weight when they're protected

 

protected $units = 0;
protected $weightPerUnit = 1.0;

 

EDIT

What were your results for this last time anyway

[snowman15]

I fixed it and it still isnt showing any value when i run the php page.

 

 

php file:

<?php
include('exam1p3.inc.php');
  $bottles= new UnitCounter(24,0);
  $books= new UnitCounter(10,1.5);
  $bottles->add(3);
  echo $bottles->$units."<br />";
  echo $books->totalWeight();
?>

 

included file code:

<?php 
class UnitCounter
{//start class
$units = 0;
$weightPerUnit = 1.0;
function __construct($unit,$weight)
{
   $this->units = $unit;
   $this->weight = $weight;
}
function add($num = 1)  // Add $num to the total number of units
{
     $this->units = $this->units + $num;
   
}

function totalWeight()  // Calculate the total weight
  {
  return $this->units * $this->weightPerUnit;
}
}//end class
?>

 

I need it to display the units of bottles and the totalweight of books.

Thanks in advance!

 

[pocobueno1388]

This line

echo $bottles->$units."<br />";

 

Should be

echo $bottles->units."<br />";

 

Also, you should be using the "var" keyword to define your variables within the class.

 

<?php

var $units = 0;
var $weightPerUnit = 1.0;

?>

 

[snowman15]

thanks to all! it works!