How to write Classes

SumitGupta

Hi..

I have written this small piece of code on class but i give error

<?
class try
{
	var $i;
	var $j;

function try()
{
	$i=10;
	$j=20;	
}

function iSum($a, $b)
{
	$res=$a + $b + $this->i + $this->j;
	return $res;
}
}

$ctry=new try;
echo $ctry->iSum(10,13);

?>

It give undefine symbol i and j in iSum() function;
Got any idea

SumitGupta

Hi..

I forget to tell that i am using php 4.0.3 version on Windows 98 with Personnel Web Server. Is it related to the version of php i am using...

Any other suggestion is also welcomed for the same.

Thank you in advance

bubblenut

function try()
{
    $i=10;
    $j=20;    

}

should be

function try()
{
    $this->i=10;
    $this->j=20;    

}

You must use the "this" keyword for both reading and writing.

HTH
Bubble

SumitGupta

Thank you for the solution...

But One thing i would like to ask that the error is given in line where actually i call the two variable not where the error is...Why?

Thanks anyway If you have reply to this please let me know..

bubblenut

The line $i=10; is not a parse error of any sort. You are setting the local variable $i to 10, which is perfectly reasonable, just not what you actually want to do. The reason you're getting an error when you try to use the variable ($this->i) is that this variable has not yet been initialised so there is nothing there to use.