Trouble to instance object of a class. Prob very easy solving

#1
Darkone85

Posted 19 April 2010 - 01:54 AM

Learning Programmer

Members
30 posts

We have a vektortest.php in which we are said to include Vektor.php-class and in it there are methods for randomizing (randomVektor) , sorting (sortVektor) and saving these to $int_vektor.

Our code looks like this:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"xml:lang="sv" >

<head>

<title></title>
</head>
<body>

<?php
include "Vektor.php";
$var_vek = new Vektor();

$var_random->randomVektor();
echo ($int_vektor);

$var_sort->sortVektor();
echo ($int_vektor);

?>
</body>
</html>

the error message we get is:

Notice: Undefined variable: var_random in C:\wamp\www\vektortest.php on line 17

Fatal error: Call to a member function randomVektor() on a non-object in C:\wamp\www\vektortest.php on line 17

Whats wrong?

/Manne

#2
semprance

Posted 19 April 2010 - 02:20 AM

Programmer

Members
126 posts

Have you actually created Vektor objects $var_random and $var_sort in the Vektor.php file?

#3
Darkone85

Posted 19 April 2010 - 02:27 AM

Learning Programmer

Members
30 posts

Hmm... is that necessary? The methods we are calling are already in Vektor.php and since we made an instance of it in vektortest, shouldnt we be able to just use it as weve done?

#4
semprance

Posted 19 April 2010 - 02:58 AM

Programmer

Members
126 posts

Is the code you've posted not vektortest.php? Or is it an include (I don't see an include for it anywhere)?

#5
Darkone85

Posted 19 April 2010 - 03:02 AM

Learning Programmer

Members
30 posts

the code i posted is vektortest.php, correct. weve included Vektor.php in it which have the randomVektor and sortVektor methods in it.

Im sorry for noobing, we just started this course, just done with java :S

#6
semprance

Posted 19 April 2010 - 03:15 AM

Programmer

Members
126 posts

If this is the case, $var_random and $var_sort are just empty variables. If these methods are members of your class then you'll possibly need to call them from $var_vek. It's hard to know without seeing the source for Vektor.php

#7
Darkone85

Posted 19 April 2010 - 05:44 AM

Learning Programmer

Members
30 posts

I Lol'd so hard. Yeah I got that finally and the rest to work too want me to post it all? Thanks for your help man

#8
semprance

Posted 19 April 2010 - 05:58 AM

Programmer

Members
126 posts

Yeah go ahead, I'm still confused as to what was going on in the mystery include file lol.

#9
Darkone85

Posted 20 April 2010 - 03:59 AM

Learning Programmer

Members
30 posts

My final vektortest.php:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"xml:lang="sv" >

<head>

<title></title>
</head>
<body>

<?php
include "Vektor.php";
$var_vek = new Vektor();

$var_vek->randomVektor();
echo ($var_vek->formattedVektor());

$var_vek->sortVektor();
echo ($var_vek->formattedVektor());

?>
</body>
</html>

And the included Vektor.php:
<?php

class Vektor
{
//Privat attribut för klassen Vektor.
//$int_vektor kommer att innehåller vektorn.
private $int_vektor;

//Konstruktor för klassen Vektor.
//Skapar 100 platser (0-99) för $int_vektor och tilldelar varje plats värdet noll (0).
function __construct()
{
//array array_fill ( int $start_index , int $num , mixed $value )
$this->int_vektor = array_fill(0, 100, 0);
}

//Destruktor för klassen Vektor.
//Frigör tar bort $int_vektor.
function __destruct()
{
unset($this->int_vektor);
}

//Metoden string2Vektor() skapar och returnerar en vektor av strängar.
//Inkommande parameter skall vara en sträng bestående av siffror och kommatecken (,).
//Vektorn av strängar tilldelas $int_vektor.
public function string2Vektor($inString)
{
$this->int_vektor = explode(",", $inString);
}

//Metoden vektor2String() skapar en sträng av en vektor.
//Strängen som returneras består av siffor och kommatecken (,).
public function vektor2String()
{
return implode(",", $this->int_vektor);
}

//Metoden setVektor() tilldelar $int_vektor en ny vektor.
//Inkommande parameter är den nya vektorn.
public function setVektor($inVektor)
{
$this->int_vektor = $inVektor;
}

//Metoden getVektor returnerar aktuell vektor.
public function getVektor()
{
return $this->int_vektor;
}

//Metoden randomVektor() slumpar 100 tal mellan 1 och 1000 och placerar dessa i $int_vektor.
public function randomVektor()
{
for($int_raknare = 0; $int_raknare < 100; $int_raknare++)
{
$this->int_vektor[$int_raknare] = mt_rand(1, 1000);
}
}

//Metoden sortVektor() sorterar talen i $int_vektor i stigande ordning.
public function sortVektor()
{
sort($this->int_vektor);
}

//Metoden formattedVektor() skapar och returnerar en xhtml-tabell innehållande värdena i $_int_vektor.
public function formattedVektor()
{
$str_output = "<table border=\"1\">";
$int_arraycounter = 0;

for($int_outercounter = 1; $int_outercounter <= 10; $int_outercounter++)
{
$str_output .= "<tr align=\"center\">\n";
for($int_innercounter = 1; $int_innercounter <= 10; $int_innercounter++)
{

$str_output .= "<td>".$this->int_vektor[$int_arraycounter]."</td>\n";
$int_arraycounter++;
}

$str_output .= "</tr>\n";
}

$str_output .= "</table>\n";

return $str_output;
}
}

?>