Php Oo Basic Help

[Pain]

Hello. I am fairly new to the object orientated php. Just wondering if I could get any help with this one. With this code I am attempting to convert a string to upper case.

 

<?php


class Product{
public $type = "Milk";

public function convertToUpperCase(){
strtoupper($type);
}
}

$product = new Product;
echo $product->type;
echo $product->convertToUpperCase($type);


?>

 

Thanks!

[Pikachu2000]

Fantastic. Do you have a question?

[Pain]

It does not echo out the string in upper case. Where did I go wrong?

[Pikachu2000]

Turn on error reporting, and post any errors you get.

[Pain]

Notice: Undefined variable: type in /home/searchqu/public_html/ww3/main.php on line 14

 

Notice: Undefined variable: type in /home/searchqu/public_html/ww3/main.php on line 8

[ManiacDan]

Class variables are accessed with $this->type; Not just $type;

[Barand]

try

public function convertToUpperCase(){
   $this->type = strtoupper($this->type);
}

[TOA]

*Edit*

Beat me to it.

 

Also, you'll need to return from convertToUppercase or alternatively echo type again after converting.

[Pain]

Ok im starting to pick things up. I've adjusted the code to

 

<?php
error_reporting(-1);

class Product{
public $type = "Milk";

public function convertToUpperCase(){
$this->type = strtoupper($this->type);
return $this->type;
}
}

$product = new Product;
echo $product->type;
echo $product->convertToUpperCase($type);


?>

 

It now does work, but still produces an error:

 

 

Notice: Undefined variable: type in /home/searchqu/public_html/ww3/main.php on line 15

 

So there is still something not quite right with this line.

echo $product->convertToUpperCase($type);

[Jessica]

1. Your method doesn't accept any arguments, so it's useless to pass it one.

2. At that point in the code, $type is undefined. Yes.

[TOA]

*Edit*

 

Beat again!

 

I really miss the alert that used to come up (maybe I'm just not seeing it !

[Pain]

Thanks, that works just fine. Still got one q though. If i were to use a POST variable, how should it look like? Should i assign POST to variables INSIDE the class?

[Barand]

How would you like it to look - a POST variable for what?

 

No, not inside the class.

[Pain]

I want to input some text into a textbox and then use that input in the class. Not sure how to even start, couldn't find any decent tuts on that.

[TOA]

Then you need to pass it into the method.

 

Something like this

class SomeClass {
 public function useVar($var) {
	 //do something with $var
 }
}

$someval = $_POST['someval'];
$obj = new SomeClass;
$obj->useVar($somevar);

[Pain]

A bit confused...

 

<form method="POST">
<input type="text" name="someval" />
<input type="submit" name="submit" />
</form>


<?php
error_reporting(-1);

class Product{

public function convertToUpperCase($var){
if(isset($submit))
{
$this->var = strtoupper($this->var);
return $this->var;
}
}
}

$someval = $_POST['someval'];
$submit = $_POST['submit'];
$product = new Product;
echo $product->convertToUpperCase($someval);

?>

 

Once again i get the error of not defining variables:

 

Notice: Undefined index: someval in /home/searchqu/public_html/ww3/main.php on line 22

 

Notice: Undefined index: submit in /home/searchqu/public_html/ww3/main.php on line 23

 

And when i input some text nothing happens.:/

[TOA]

1. You need a class varaible to hold $this->var. Add

public $var;

as the first thing in your class definition.

 

2. You can't use $submit in the class without passing it in. You could potentially check $_POST there since it's a global though.

 

3. Your script structure is all f'd up. But one thing at a time.

[TOA]

I didn't test this, but try this

 

<?php
// handle processing and declarations first so you don't get header errors
error_reporting(-1);
class Product{
public $var;
 public function convertToUpperCase($var){
	 if(isset($_POST['submit'])){
		 $this->var = strtoupper($var);
		 return $this->var;
	 }
 }
}
if ($_SERVER['REQUEST_METHOD'] == "POST") {
// process the form
$someval = $_POST['someval'];
$product = new Product;
echo $product->convertToUpperCase($someval);
} else {
//display the form
<form method="POST">
<input type="text" name="someval" />
<input type="submit" name="submit" />
</form>
}
?>

[Pain]

Still gives me an error - Notice: Undefined index: someval in /home/searchqu/public_html/ww3/main.php on line 17

[ManiacDan]

The code you're given on a forum may just be an example, and not designed to be blindly copied and pasted into your application without any problems. If you'd like to blindly copy and paste without reading it and learning how it works, we have a freelancer forum where you can hire employees.

 

'someval' was used in that code to indicate some value, a value you need to provide.