Error: Fatal error: Call to a member function MoveFirst() on a non-object

I have written a function based on code posted by Jason to get the cheapest price of a product which is at the bottom of my view cart page whilst I am testing

<?php 
function i8_buy5get1free($cat,$type) {
	$eCart1->MoveFirst(); // this is line 298
	$price = $eCart1->DisplayInfo("Price"); 
	while (!$eCart1->EOF()) { 
		if(($eCart1->DisplayInfo("CatID") == $cat) && ($eCart1->DisplayInfo("TypeID") == $type)) {
			if($eCart1->DisplayInfo("Price") < $price) $price = $eCart1->DisplayInfo("Price"); 
		}
		$eCart1->MoveNext(); 
	} 
	$eCart1->MoveFirst(); 
	return $price;
}
?>

which I am using in my discount tab as the attached screenshot

But when I hit the view cart page I get this error Fatal error: Call to a member function MoveFirst() on a non-object in /Volumes/Western Digital/Sites/tshirt-town/view-basket.php on line 298

what am I doing wrong ?

fixed adding global $eCart1; inside my function solved the issue

[code]
function i8_findCheapest($subcat,$type) {
global $eCart1;

if (!$eCart1->IsEmpty()) {
$eCart1->MoveFirst();
$price = $eCart1->DisplayInfo("Price");
while (!$eCart1->EOF()) {
if(($eCart1->DisplayInfo("Price") < $price) && (($eCart1->DisplayInfo("SubcatID") == $subcat) && ($eCart1->DisplayInfo("TypeID") == $type))) $price = $eCart1->DisplayInfo("Price");
$eCart1->MoveNext();
}
$eCart1->MoveFirst();
return $price;
}
}
[code]

where is this function code?


Is it added to the cart include file? if so, you should reference the cart object as $this instead of $eCart1

Jason,

it's in an external include file

ahh, that's why you needed the global variable.