Fortuno, Adam wrote:
All,
Chris makes a good point i.e., "unknown compared to anything is
unknown". His comment made me want to clarify my earlier note. In my
earlier example, I wasn't suggesting that-that logic be coded in the
database. I was assuming it would be in the page:
<?php
$TestNullValue = NULL;
If ($TestNullValue) {
print "Evaluates to true!";
} else {
print "Evaluates to false!";
}
?>
I tested this, and it worked. Here is why, PHP (like pretty much every
other language) silently casts a NULL to false:
"When converting to boolean, the following values are considered FALSE:
- the boolean FALSE itself
- the integer 0 (zero)
- the float 0.0 (zero)
- the empty string, and the string "0"
- an array with zero elements
- an object with zero member variables (PHP 4 only)
- the special type NULL (including unset variables)" ("Booleans",
php.net, 05 Dec. 2008).
If you use the shortcut php check, but you can do it the longer way.
if ($value !== null) {
...
}
Can you turn off email notifications too please? It's rather annoying
when it's on a public mailing list.
--
Postgresql & php tutorials
http://www.designmagick.com/
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
