Odd new errors

I have built a website using ecart 5.01 about 6 months ago, and it has been working fine without errors.
Now all of a sudden I'm getting errors on every page, the main page i'm having problems with is the product view page where the add to cart, view cart, clear cart, and checkout buttons all are no longer working..

Nothing has changed since the working version, i have tried restoring backups.

I've asked my host if anything has been changed or updated PHP wise on their servers and they assure me that nothing has changed.

The main problems i'm getting the error is pointing towards WA_eCart/ShoppingCart_PHP.php on line 146

which is this function, line 146 being the last line (set cookie)

function SetCookieInfo($theCookieString)     {

  $numDays   = 14;

  $theDomain = "";

  $thePath   = "";

  $cookSec   = false;

  if ($numDays == "") $numDays="0";

  $theDate = strtotime("+".$numDays." Days");

  setcookie($this->CartName."_Items", $theCookieString, $theDate, $thePath, $theDomain, $cookSec);

}

Does this mean anything to you guys? I have tried rebuilding the product view page with version 5.03 of ecart, and its still having the same errors.

what is the error?

you need to provide the exact error message for us to help, just telling where the error points to is no help without knowing what the error itself is

The weird thing is I have exactly the same code on my product_search page, and that works fine..

Here are the error's I'm getting:

Add to Cart:

  Warning: Cannot modify header information - headers already sent by (output started at /home/costumff/public_html/product_view.php:1) in /home/costumff/public_html/WA_eCart/ShoppingCart_PHP.php on line 146 Warning: Cannot modify header information - headers already sent by (output started at /home/costumff/public_html/product_view.php:1) in /home/costumff/public_html/WA_eCart/ShoppingCart_PHP.php on line 146  

Clear Cart:

  Warning: Cannot modify header information - headers already sent by (output started at /home/costumff/public_html/product_view.php:1) in /home/costumff/public_html/WA_eCart/ShoppingCart_PHP.php on line 146  

Checkout:

  Warning: Cannot modify header information - headers already sent by (output started at /home/costumff/public_html/product_view.php:1) in /home/costumff/public_html/product_view.php on line 140  

note: line 140 of product_view.php is the header line:

// WA eCart Redirect
if ($ShoppingCart->redirStr != "")     {
  header("Location: ".$ShoppingCart->redirStr);
}

Thanks Jason.

this is the headers already sent error.

the important part of the error to note is:

output started at /home/costumff/public_html/product_view.php:1


this is telling you that the cause of the error is on the product_view.php page at line 1.

see the following thread for details on troubleshooting the headers already sent error:
showthread.php?t=19285

in your case i think the issue is The Unicode Signature (BOM) PHP bug described at the end of that post.

I've attached a screenshot, I cannot uncheck the DOM box. any ideas??

open it in another text editor like Text Wrangler and go to Save as, most text editors have an option for changing the encoding that you can select, for example in text wrangler there is an encoding option for UTF-8, No BOM

excellent, thanks Jason..
I couldnt use text wrangler because i run windows, but downloaded notepad++ which gave me the option.

Appears to be working now.

glad to hear it is working.