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Date: Tue, 19 Apr 2005 02:28:58 +0700
Reply-To: garbageman@gauldong.net
To: Sara Golemon <pollita@php.net>
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	<20050418185855.94161.qmail@lists.php.net>
Subject: Re: [PHP-DEV] Re: == and ===
From: gauldong@gmail.com (Hendy Irawan)

On 4/19/05, Sara Golemon <pollita@php.net> wrote:
> > Just came across this:
> > http://bugs.php.net/bug.php?id=3D23110
> >
> > I've been programming PHP since PHP 3
> > and wasn't even aware of this behavior.
> >
> And now you are.
>=20
> PHP is a loosely typed language.  Odds are it's one of the things which
> attracted you to it in the first place.

I can understand 0 =3D=3D '' is true, but the string thingy is a bit surpri=
sing me.

I thought =3D=3D=3D is only used when comparing different types, so it's
used to strictly compare things of the same type as well? (as the
case, strings, but objects come to mind as well)

I guess =3D=3D=3D is a strict equality operator more than it is a type
equality operator.

> > "Numeric strings"? What is that?
> >
> Roughly speaking, a string matching the pattern:
> /^(-\d)?\d*(.[0-9]*)?(E[+-]\d+)?/
> Though that's not precisely how the engine handles it internally.
>=20
> > if ($typedPassword =3D=3D $password) doSomeAdministrativeTaskHere();
> >
> > You better not use '000000001' as password, or '0e00.0000', since
> > people would be able to use '' (yes, empty string!) to hack your app.
> >
> Quick! Go change your password!

<?php echo '0' =3D=3D '0.0000e0' ?>
1

<?php echo '0' =3D=3D 'asadoaskd' ?>
(nothing, false)

<?php echo '0' =3D=3D (int)'adasd' ?>
1

That confuses me more (but understandable, and thank God PHP behave
this way)... I thought 'asdasd' is 0 when [implicitly] converted to
int [for comparison]? I guess I never knew PHP well :-(

--=20
Hendy Irawan
http://www.gauldong.net
http://dev.gauldong.net