Completely bizarre PHP behavior.

Posted by George Edison on Stack Overflow See other posts from Stack Overflow or by George Edison
Published on 2010-03-23T03:34:11Z Indexed on 2010/03/23 3:41 UTC
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Boy, this one is really weird. I expect the following code to print 1990, but it prints 1989!

$val = '$19.9';

$val = preg_replace('/[^\d.]/','',$val);
$val = intval($val * 100);

echo $val;

Why on earth is this happening?

Edit: and this code:

$val = '$19.9';
$val = preg_replace('/[^\d.]/','',$val);
echo $val . "<br>";
$val = $val * 100;
echo $val . "<br>";
$val = intval($val);
echo $val;

Prints:

19.9
1990
1989

Why does intval(1990) equal 1989???

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