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Date: Tue, 18 Oct 2011 22:09:37 +0200
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Cc: Alain Williams <addw@phcomp.co.uk>
References: <201110142008.56344.arnaud.lb@gmail.com> <20111017130730.GA27102@phcomp.co.uk>
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Message-ID: <201110182209.37210.arnaud.lb@gmail.com>
Subject: Re: [PHP-DEV] Ternary operator performance improvements
From: arnaud.lb@gmail.com (Arnaud Le Blanc)

Hi,

Le Monday 17 October 2011 15:07:30, Alain Williams a =E9crit :
> On Fri, Oct 14, 2011 at 08:08:56PM +0200, Arnaud Le Blanc wrote:
> > Hi,
> >=20
> > I've already posted this patch and it has since been reviewed and
> > improved. I'm re-posting it for discussion before eventually commiting
> > it.
> >=20
> > The ternary operator always copies its second or third operand, which is
> > very
>=20
> > slow compared to an if/else when the operand is an array for example:
> Is that why the following does not work as I expected:
>=20
>     $dbh =3D $how =3D=3D 'r' ? (&$dbh_r) : (&$dbh_w);
>=20
> $dbh is NOT a reference to $dbh_r or $dbh_w.

This is expected;=20
http://docs.php.net/manual/en/language.operators.comparison.php explains it:

> Please note that the ternary operator is a statement, and that it doesn't=
=20
evaluate to a variable, but to the result of a statement.

This is why you can't assign the result of the ternary operator by referenc=
e.=20
The patch doesn't change this.

Best regards,