problem with bind_param

["Hulf" <ross@xxxxxxxxxxxxxx>]

Hi,

I am still having poblems with the php5 functions. I have 4 variables in 
each. What is the problem?


Warning: mysqli_stmt::bind_param() [function.mysqli-stmt-bind-param]: Number 
of elements in type definition string doesn't match number of bind variables 
in xxxx on line 21

$prep = $mysqli->prepare ("UPDATE events SET title=?, date=?, content=?, 
imageUrl=?");
$prep->bind_param ( $_POST['title'], $_POST['date'], $_POST['content'], 
$_POST['imageUrl']);

thanks,

H. 

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