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Date: Tue, 19 Apr 2005 03:05:18 +0700
Reply-To: garbageman@gauldong.net
To: Sara Golemon <pollita@php.net>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] Re: == and ===
From: gauldong@gmail.com (Hendy Irawan)

On 4/19/05, Sara Golemon <pollita@php.net> wrote:
> > <?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 :-(
> >
> That would be the 'Roughly Speaking' and 'not precisely how the engine
> handles it internally' parts.
>=20
> In the case of string to string comparison there must be at least one dig=
it
> involved at the start of the string  (or a plus/minus sign followed by
> digits, etc...) in order to qualify as a numeric string.
I don't see this is the case:

<?php echo '0' =3D=3D '0asodkaowueoq' ?>
(false)

<?php echo '0' =3D=3D '0 asdkasod' ?>
(false)

Isn't '0asdkoasdk' a numeric string?

However:

<?php echo 0 =3D=3D 'asodkasodk' ?>
1

(this is expected, although for the $password case, it can lead to
security holes).
More niceties:

<?php echo null =3D=3D 0 ?>
1

<?php echo null =3D=3D '' ?>
1

<?php echo null =3D=3D '0' ?>
(false)

Programming in PHP can be a lot of fun! ;-)

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