I wrote:
>
>
> Trying out some code with Php 5.3.1-dev:
>
> $sql = "SELECT false";
> $stmt = $dbh->query($sql);
> $result = $stmt->fetch(PDO::FETCH_NUM);
> print(" " . $result[0] . "\n");
>
> reproduces what Yujin is seeing...
After a bit of digging through the PDO code, I see what is happening.
the ->fetch operation is returning a Php boolean correctly from PDO (you
can use var_dump($result[0]) to check this), but when you use print as
above, Php casts the boolean to string - and for whatever reason Php
reckons turning (boolean)false into (string)"" is the way to go. So to
get a sensible result you need to do something like:
$result = $stmt->fetch(PDO::FETCH_NUM);
print(" " . (integer) $result[0] . "\n");
i.e: explicit cast on the result value.
This is confusing and seemingly not consistent - for instance the Mysql
version of this example returns a string "0" from PDO, so gives a 0 for
false in a more expected/intuitive way...
regards
Mark
