Function isset() undefined?

[Francky683]

Hi all,
I've been workin with PHP for some time and I must say I just had the weirdest error ever this afternoon. Here are the code lines :

<?
$cartSql = mysql_query("SELECT * FROM ".$table_suffixe."shop_carts WHERE cart_id = ".str_replace("cart","",$_GET['id'])." AND user_id = ".$_SESSION['session_user_id']);
if(isset($_GET['id']) && isset($_GET['uid']) && isset($_GET['value']) && (mysql_num_rows($cartSql) == 0) && (md5($_SESSION['session_unique_id']) == $_GET['uid']))
{
$cartRow = mysql_fetch_array($cartSql);
$priceShipping = ($cartRow['price']*$shoppingCart->shippingFees/100);
$priceShopping = ($cartRow['price']*$shoppingCart->shoppingTaxes/100);
if(md5(str_replace($notGoodChars,"",round($cartRow['price']+$priceShipping,$priceShopping,2))) !== $_GET['value'])
{

}
}
else{
echo "
<div style=\"padding:5px;\">
You didn't follow the good link, please follow the one in the email that contains your order's informations.
</div>
";
}
?>

Error message :

Fatal error: Call to undefined function: isset() in /mounted-storage/home19a/sub001/sc19472-DQUQ/www/acidreign/shop/completed.php on line 9

Can anyone help me with this?

Best regards,

Francis B.

[boeing747fp]

did you try

if(!empty())

[GJay]

PHP Version?
has someone been messing with runkit?

(suggesting to use empty is rather silly, standard functions shouldn't be undefined...)

[boeing747fp]

i know... but if it's that odd that isset() wont work, maybe it's odd that empty() would :p

[Francky683]

doesn't work as well ... anyone?

and it won't work only on this page

[GJay]

Only on one page?
What's the rest of the code on the page? (the line number doesn't match the error message otherwise...)
PHP version? (again...)
does looking at phpinfo() output look sensible?

[_Aerospace_Eng_]

I wonder if it matters if the php was opened using short open tags
<?
rather than
<?php

[marek_mar]

isset() is not a function.
To get that error you would have to call isset() via variable functions.

[Vin0rz]

isset() is not a function.

Hold on a minute. What's this then? (http://nl2.php.net/manual/en/function.isset.php)

[fci]

vin0rz, what he means is:
Note: Because this is a language construct and not a function, it cannot be called using variable functions

[Vin0rz]

vin0rz, what he means is:

So that means he would have to have done:

$function = 'isset';
if($function(true){
//blabla

Which he didn't, right?

[_Aerospace_Eng_]

isset() returns true or false.
$var = 'test';
if(isset($var)) // returns true
{
// do something
}

This is all the OP is doing so it should work.