adding to a string

[Stijn Goris]

hi all,

I have a string $string

I initialize the string:
$string = "test string<br>";

I want to add text to the string along my script but:
$string += "more information<br> ";

doesn't seem to work.

Someone an help me?

regards
Stijn

[zapf]

Re: adding to a string

El Dijous 29 Gener 2004 16:49, Stijn Goris va escriure:

Hi!
[color=blue]
> I want to add text to the string along my script but:
> $string += "more information<br> ";
>
> doesn't seem to work.[/color]

Try:
$string .= "more information<br> ";

Regards

--

En cap cap cap el que cap en aquet cap.

[Keith Bowes]

Re: adding to a string

zapf wrote:[color=blue][color=green]
>>$string += "more information<br> ";
>>
>>doesn't seem to work.[/color]
>
>
> Try:
> $string .= "more information<br> ";
>[/color]

Yeah, but why didn't they overload the + operator like other languages?
Because for concatenation, we have ., which is traditionally used for
object access. For that, we have the C++ object pointer operator, ->.
Not that I'm complaining, but it seems to be an unnecessary deviation
from the norm in such a fundamental area.

[Phil Roberts]

Re: adding to a string

With total disregard for any kind of safety measures Keith Bowes
<do.not@spam.me > leapt forth and uttered:
[color=blue]
> zapf wrote:[color=green][color=darkred]
>>>$string += "more information<br> ";
>>>
>>>doesn't seem to work.[/color]
>>
>>
>> Try:
>> $string .= "more information<br> ";
>>[/color]
>
> Yeah, but why didn't they overload the + operator like other
> languages?
> Because for concatenation, we have ., which is traditionally
> used for
> object access. For that, we have the C++ object pointer
> operator, ->. Not that I'm complaining, but it seems to be an
> unnecessary deviation from the norm in such a fundamental area.
>
>[/color]

Becuase thats the way PHP works. The . operator for concatenation
was borrowed from Perl, as was the -> operator (although it
originated in C++)

In PHP += Is used in numeric calculations, I think $i += 2 is the
same as $i = $i + 2.

--
Phil Roberts | Nobody In Particular | http://www.flatnet.net/

[Pedro Graca]

Re: adding to a string

Keith Bowes wrote:[color=blue]
> Yeah, but why didn't they overload the + operator like other languages?
> Because for concatenation, we have ., which is traditionally used for
> object access. For that, we have the C++ object pointer operator, ->.
> Not that I'm complaining, but it seems to be an unnecessary deviation
> from the norm in such a fundamental area.[/color]

so that you can do:

<?php
$n = 3;
$s = '6';

echo $n + $s; // 9
echo $n . $s; // 36
echo $s + $n; // 9
echo $s . $n; // 63
?>


compare with my feeble attempt at C++

#include <iostream.h>

int main(void) {
int n=3;
char* s="6";
// I don't know how to display 9 or 36
// as the result of an operation over n
// and s now
cout << n << s << "\n"; // ok for 36 :-)
return 0;
}
--
--= my mail box only accepts =--
--= Content-Type: text/plain =--
--= Size below 10001 bytes =--

[CountScubula]

Re: adding to a string

it also helps if you are looking at some code that was written a while back,
and you are midstream and see:

$var .= $var2;

you know this is string concatenation not a math addition.

if you were to see:

$var += $var2

you would have no idea if it is $var = $var + $var2 or if it is $var =
"$var$var2"
this is another reason it is serperate.

just my $.02

--
Mike Bradley
http://www.gzentools.com -- free online php tools
"Keith Bowes" <do.not@spam.me > wrote in message
news:nxbSb.1565 3$dF4.11829@fe0 2.usenetserver. com...[color=blue]
> zapf wrote:[color=green][color=darkred]
> >>$string += "more information<br> ";
> >>
> >>doesn't seem to work.[/color]
> >
> >
> > Try:
> > $string .= "more information<br> ";
> >[/color]
>
> Yeah, but why didn't they overload the + operator like other languages?
> Because for concatenation, we have ., which is traditionally used for
> object access. For that, we have the C++ object pointer operator, ->.
> Not that I'm complaining, but it seems to be an unnecessary deviation
> from the norm in such a fundamental area.
>[/color]

[Andy Hassall]

Re: adding to a string

On Thu, 29 Jan 2004 12:35:45 -0500, Keith Bowes <do.not@spam.me > wrote:
[color=blue][color=green][color=darkred]
>>>$string += "more information<br> ";
>>>
>>>doesn't seem to work.[/color]
>>
>> Try:
>> $string .= "more information<br> ";[/color]
>
>Yeah, but why didn't they overload the + operator like other languages?[/color]

It's a matter of opinion as to whether this:

<pre>
<?php
print "1" + "2";
print "\n";
print "1" . "2";
?>
</pre>

Should output:

3
12

(which it does)

Or:

12
12

Both are reasonable from different points of view; PHP went with the first.
Given that numeric values often come in as strings from $_GET/$_POST, always
doing arithmetic for '+', and having concatenation as a separate operator
probably makes more sense in the majority of cases.

--
Andy Hassall <andy@andyh.co. uk> / Space: disk usage analysis tool
<http://www.andyh.co.uk > / <http://www.andyhsoftwa re.co.uk/space>