Doublebang
Ever seen or written this PHP code?
function foo( $foo ) {
// magic
if ( $foo ) // $foo is not bool
return true;
else
return false;
}
So you want to return a boolean value (true/false) but $foo isn’t a bool so you can’t return it directly.
Option 1, cast to boolean:
function foo( $foo ) {
// magic
return (boolean) $foo;
}
Option 2, cast to “bool” (shortcut):
function foo( $foo ) {
// magic
return (bool) $foo;
}
Option3, doublebang:
function foo( $foo ) {
// magic
return !!$foo;
}
The first ! (the “not” operator) casts $foo to a negative bool, and the second one flips it back to the bool representation of its original value.
And of course if you want to return true when the variable evaluates as false, you can just do:
function foo( $foo ) {
// magic
return !$foo;
}
Appologies to anyone who has read this far and was expecting pornography.
Besic thing, love to see.
Btw, if some porn for extra will be the best
n-blue
October 11, 2007 at 1:57 pm
Heh. Thanks for this, but I really didn’t know “doublebang” refers to porn.
Aja
October 11, 2007 at 2:03 pm
(* Stares at Aja and blinks in disbelief *)
You’re a young pup, still…
Mark Steel
October 11, 2007 at 2:17 pm
Hahahahaha!
Mark Ghosh
October 11, 2007 at 2:44 pm
LOL, nice post end xD
Javier Aroche
October 11, 2007 at 2:58 pm
Yes, I came here looking for php code…. yes It’s true! XD
expresion-x
October 11, 2007 at 3:53 pm
I would have to say that if we are trying to write obtuse but valid php code then either
return $foo && $fooor the more elegant, and a favourite of minereturn $foo ? true : falsePeter Westwood
October 11, 2007 at 4:36 pm
nice job
taby
October 11, 2007 at 6:23 pm
Pretty cool!
I just usually use this though:
return ( !empty($foo) ) ? TRUE : FALSE;Viper007Bond
October 11, 2007 at 8:46 pm
[...] Doublebang Ever seen or written this PHP code? [...]
Top Posts « WordPress.com
October 12, 2007 at 1:20 am
A programmer I see!!! I took two years of computer programming in my schooling. It helped me a lot, sometimes I would use the software to create simple games or to figure out my homework =]
http://scott47.wordpress.com/
scott47
October 12, 2007 at 4:23 am
Someone fancying an Obfuscated PHP Contest like Perl had?
Ozh
October 12, 2007 at 7:48 am
@Aja
More familiar to “Gangbang”?
n-blue
October 12, 2007 at 10:39 am
Nice.. fun
rxbbx
October 13, 2007 at 5:54 am
@n-blue: Now, I know. ROFL
@Viper007Bond:
return !empty($foo);would actually produce the same result, the ternary op just makes it explicit and redundant. Besides,!!is still shorter than!empty().Aja
October 13, 2007 at 12:43 pm
rxbbx: Now, now, “gang” suggest more than two … heh
Mark Steel
October 14, 2007 at 2:29 pm
Err, oops. I meant n-blue. Sorry.
(Of course, I’d throw a missing “s” up there if I could edit, too)
Mark Steel
October 14, 2007 at 2:30 pm
i got here because i thought it referred to Max/MSP
dlab
October 16, 2007 at 4:07 pm
… I was so disappointed…
Maja
October 17, 2007 at 2:50 pm
I realize this is completely off-topic, but is it possible to order front page posts – last commented on top? And if it is possible, (there is no plugin-I checked) what would writing a this kind of plugin include?
vlad
October 23, 2007 at 1:26 am
[...] Doublebang « Mark on WordPress (tags: php wordpress) Share and Enjoy: These icons link to social bookmarking sites where readers can share and discover new web pages. [...]
links for 2008-01-24 | a minor technicality
January 24, 2008 at 3:22 am
I don’t Ever saw this PHP code. This is very curious xP
Gry Logiczne
September 21, 2008 at 10:56 am