ampersand before var in function

[frizzle]

Hi there,

Recently i noticed a few times an ampersand in front of a variable in a
function.
Like so:

function foo( &$bar )
{
// do something
};

What is it for? I can't figure it out ...

Frizzle.

[noone]

Re: ampersand before var in function

frizzle wrote:[color=blue]
> Hi there,
>
> Recently i noticed a few times an ampersand in front of a variable in a
> function.
> Like so:
>
> function foo( &$bar )
> {
> // do something
> };
>
> What is it for? I can't figure it out ...
>
> Frizzle.
>[/color]


from:

http://www.softwareprojects.org/php-functions-12.htm

Another way to access the data outside the function, without using an
argument is by using a reference to a variable as an argument. You can
do this by placing an ampersand “&” in front of the argument, when you
define the function. This way, the function will directly access the
variable thru the reference, and the variable can be assigned and read
at the same time.

[frizzle]

Re: ampersand before var in function


noone wrote:[color=blue]
> frizzle wrote:[color=green]
> > Hi there,
> >
> > Recently i noticed a few times an ampersand in front of a variable in a
> > function.
> > Like so:
> >
> > function foo( &$bar )
> > {
> > // do something
> > };
> >
> > What is it for? I can't figure it out ...
> >
> > Frizzle.
> >[/color]
>
>
> from:
> http://www.softwareprojects.org/php-functions-12.htm
>
> Another way to access the data outside the function, without using an
> argument is by using a reference to a variable as an argument. You can
> do this by placing an ampersand "&" in front of the argument, when you
> define the function. This way, the function will directly access the
> variable thru the reference, and the variable can be assigned and read
> at the same time.[/color]

Hmm, could you maybe give me a small simple example ?

Thanks.

Frizzle.

[ColdShine]

Re: ampersand before var in function

frizzle in news:1142637987 .677378.96420@z 34g2000cwc.goog legroups.com wrote:
[color=blue]
> noone wrote:
>[color=green]
>> frizzle wrote:[/color]
>[color=green][color=darkred]
>>> Hi there,
>>>
>>> Recently i noticed a few times an ampersand in front of a variable in a
>>> function.
>>> Like so:
>>>
>>> function foo( &$bar )
>>> {
>>> // do something
>>> };
>>>
>>> What is it for? I can't figure it out ...[/color]
>>
>> from:
>> http://www.softwareprojects.org/php-functions-12.htm
>>
>> Another way to access the data outside the function, without using an
>> argument is by using a reference to a variable as an argument. You can
>> do this by placing an ampersand "&" in front of the argument, when you
>> define the function. This way, the function will directly access the
>> variable thru the reference, and the variable can be assigned and read
>> at the same time.[/color]
>
> Hmm, could you maybe give me a small simple example ?[/color]

function modify_arg1(&$a rg1, $arg2)
{
$arg1 = 'first';
$arg2 = 'second';
}

$arg1 = 1;
$arg2 = 2;
modify_arg1($ar g1, $arg2);
echo $arg1;
echo $arg2;

Outputs:
first
2

Hope this helps!
--
ColdShine

"Experience is a hard teacher: she gives the test first, the lesson
afterwards." - Vernon Sanders law

[frizzle]

Re: ampersand before var in function


ColdShine wrote:[color=blue]
> frizzle in news:1142637987 .677378.96420@z 34g2000cwc.goog legroups.com wrote:
>[color=green]
> > noone wrote:
> >[color=darkred]
> >> frizzle wrote:[/color]
> >[color=darkred]
> >>> Hi there,
> >>>
> >>> Recently i noticed a few times an ampersand in front of a variable in a
> >>> function.
> >>> Like so:
> >>>
> >>> function foo( &$bar )
> >>> {
> >>> // do something
> >>> };
> >>>
> >>> What is it for? I can't figure it out ...
> >>
> >> from:
> >> http://www.softwareprojects.org/php-functions-12.htm
> >>
> >> Another way to access the data outside the function, without using an
> >> argument is by using a reference to a variable as an argument. You can
> >> do this by placing an ampersand "&" in front of the argument, when you
> >> define the function. This way, the function will directly access the
> >> variable thru the reference, and the variable can be assigned and read
> >> at the same time.[/color]
> >
> > Hmm, could you maybe give me a small simple example ?[/color]
>
> function modify_arg1(&$a rg1, $arg2)
> {
> $arg1 = 'first';
> $arg2 = 'second';
> }
>
> $arg1 = 1;
> $arg2 = 2;
> modify_arg1($ar g1, $arg2);
> echo $arg1;
> echo $arg2;
>
> Outputs:
> first
> 2
>
> Hope this helps!
> --
> ColdShine
>
> "Experience is a hard teacher: she gives the test first, the lesson
> afterwards." - Vernon Sanders law[/color]

Ha that's great! So it changes a variable that exists before the
function is called!
Cool.

Frizzle.