Possibile bug?

**Maverick FC** · Mar 23 '07, 02:35 AM

Re: Possibile bug?

On Fri, 23 Mar 2007 01:57:27 GMT, "Maverick FC"
<freeculture@NO SPAMlibero.itwr ote:

What should output this piece of code?
I think it's not normal what's outputting to me...

Here it is what I'm trying to say:

function foo() { return 'Hello World!'; }

echo '<pre>';
if ( $str = foo() ) var_dump($str);
if ( $str = foo() || $str = foo() ) var_dump($str);
echo '</pre>';

Is that normal?

Thanks.
Maverick

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**Geoff Muldoon** · Mar 23 '07, 02:55 AM

Re: Possibile bug?

freeculture@NOS PAMlibero.it says...

>
function foo() { return 'Hello World!'; }
if ( $str = foo() || $str = foo() ) echo $str;
>
What should output this piece of code?
I think it's not normal what's outputting to me...
>
Let me know. :-)
Maverick

It should (and I presume does) return 1.

I presume you just don't know why.

Geoff M

**Maverick FC** · Mar 23 '07, 03:05 AM

Re: Possibile bug?

On Fri, 23 Mar 2007 13:52:14 +1100, Geoff Muldoon
<geoff.muldoon@ trap.gmail.comw rote:

It should (and I presume does) return 1.

Actually, it returns bool(true).

I presume you just don't know why.

You're correct. :-) Why?

This code:

if ( $str = foo() ) var_dump($str);

returns the string - as I expected.

foo() is always - correctly - executed only once.
I just can't understand this behaviour.

Thanks.
Maverick

--
«Che non siete più liberi di non avere una casa con letto per dormire.
Lavorate voi - schiavi dei soldi - che non sentite la puzza della
schiavitù!» (a Mario di Monte Mario, Roma) # http://libre.netsons.org/

**Maverick FC** · Mar 23 '07, 03:25 AM

Re: Possibile bug?

On Fri, 23 Mar 2007 02:32:12 GMT, "Maverick FC"
<freeculture@NO SPAMlibero.itwr ote:

if ( $str = foo() || $str = foo() ) var_dump($str);

Ok, I got it.
I simply have to use brackets:

if ( ($str = foo()) || ($str = foo()) ) var_dump($str);

Stupid precedence! ;-)

Thank you, Geoff.

Greetings.
Maverick

--
«Che non siete più liberi di non avere una casa con letto per dormire.
Lavorate voi - schiavi dei soldi - che non sentite la puzza della
schiavitù!» (a Mario di Monte Mario, Roma) # http://libre.netsons.org/

**peter** · Mar 23 '07, 06:55 AM

Re: Possibile bug?

>It should (and I presume does) return 1.

>
Actually, it returns bool(true).
>

>I presume you just don't know why.

>
You're correct. :-) Why?
>
This code:
>
if ( $str = foo() ) var_dump($str);
>
returns the string - as I expected.
>
foo() is always - correctly - executed only once.
I just can't understand this behaviour.

$str = foo() is always going to be true as you are assigning $str to foo()
if you are trying to see if what is returned by foo() is the same as $str
then you should use == or ===

**Geoff Berrow** · Mar 23 '07, 07:35 AM

Re: Possibile bug?

Message-ID: <etvt90$fgf$1@a ioe.orgfrom peter contained the following:

>$str = foo() is always going to be true as you are assigning $str to foo()
>if you are trying to see if what is returned by foo() is the same as $str
>then you should use == or ===

Spoilsport...

--
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My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/

**David Quinton** · Mar 23 '07, 07:55 AM

Re: Possibile bug?

On Fri, 23 Mar 2007 01:57:27 GMT, "Maverick FC"
<freeculture@NO SPAMlibero.itwr ote:

>
>function foo() { return 'Hello World!'; }
>if ( $str = foo() || $str = foo() ) echo $str;
>
>What should output this piece of code?
>I think it's not normal what's outputting to me...

== for comparison
= for assignment
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