[RESOLVED] PHP newbie help

[Osiris]

Hi everyone,
I am sort of new to PHP and i have a few questions...

1. $_SESSION["cart"] is supposed to be an array which holds an array variable which in the code its supposed to be $arow...

is there anything wrong with this code?

$arow = array($id, $qty, $prc);
if(isset($_SESSION["cart"]))
{
	$found = 0;
	foreach($_SESSION["cart"] as $value)
	{
		if($id == $value[0])
		{
			$found = 1;
		}
	}
	if($found == 0)
	{
		count++;
		$_SESSION["cart"][] = $arow;
	}
}
else
{
	$count = 1;
	$_SESSION["cart"][] = $arow;
}

2. When having a link, or a button, how does one go about so that a php function is called when that button is pressed or link is clicked ?

Thanks in advanced