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Date: Wed, 27 Feb 2019 09:44:13 +0100
In-Reply-To: <CADq_Cxo6g-HLY6JagnA1M5n-Buw=12MBp2ympdq0mVzQuDrC6w@mail.gmail.com>
Cc: Nikita Popov <nikita.ppv@gmail.com>,
 PHP internals <internals@lists.php.net>
To: "Kingsquare.nl - Robin Speekenbrink" <robin@kingsquare.nl>
References: <CAF+90c821boRO6YsO0SH0JbDb8E8eTHfEK=e4Y5_z9P7+OOnUg@mail.gmail.com>
 <CADq_Cxo6g-HLY6JagnA1M5n-Buw=12MBp2ympdq0mVzQuDrC6w@mail.gmail.com>
Subject: Re: [PHP-DEV] [RFC] Saner string to number comparisons
From: claude.pache@gmail.com (Claude Pache)

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> Le 27 f=C3=A9vr. 2019 =C3=A0 09:06, Kingsquare.nl - Robin Speekenbrink =
<robin@kingsquare.nl> a =C3=A9crit :
>=20
> As of the 0 =3D=3D "" bit: I do think that an empty string is =
widespread
> regarded as falsey-string... Thus 0 =3D=3D "" sould IMHO return =
true...
>=20

0 =3D=3D "" evaluating to true has been a footgun for me in the past; =
something like that:

```php
$state =3D $_GET['state'] ?? null;
// ...
switch ($state) {
    case 0: // when $state =3D=3D=3D "", this branch is incorrectly =
chosen
    // ...
}
```

where the `state` parameter comes from <select name=3D"state"> and is =
supposed to provide an optional filter criterion for some list.

The fact that both values are falsy doesn=E2=80=99t mean that they =
should be equal (hopefully, `array() =3D=3D 0` evaluates to false).

=E2=80=94Claude


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