<?
$a="1+1"; //variables(string)

//how can arithmetic variables(string) ??
//N ROW................

//output
echo $a //i need output "2" not "1+1"
//Please , Thank You Very Much !!
?>

On 10/18/07, LKSunny <ad@pc86.com> wrote:
>
> <?
> $a="1+1"; //variables(string)
>
> //how can arithmetic variables(string) ??
> //N ROW................
>
> //output
> echo $a //i need output "2" not "1+1"
> //Please , Thank You Very Much !!
> ?>


$a = 1+1;
echo $a;

-nathan

LKSunny wrote:
> <?
> $a="1+1"; //variables(string)
>
> //how can arithmetic variables(string) ??
> //N ROW................
>
> //output
> echo $a //i need output "2" not "1+1"
> //Please , Thank You Very Much !!
> ?>
>

You can do:

eval("echo $a;");

But be warned, this has "Injection Attack" written all over it!

Col

Thank You !

"Colin Guthrie" <gmane@colin.guthr.ie> ¼¶¼g©ó¶l¥ó·s»D:ff76fg$ii3$1@ger.gmane.org...
> LKSunny wrote:
>> <?
>> $a="1+1"; //variables(string)
>>
>> //how can arithmetic variables(string) ??
>> //N ROW................
>>
>> //output
>> echo $a //i need output "2" not "1+1"
>> //Please , Thank You Very Much !!
>> ?>
>>
>
> You can do:
>
> eval("echo $a;");
>
> But be warned, this has "Injection Attack" written all over it!
>
> Col

Colin Guthrie wrote:
> LKSunny wrote:
>> <?
>> $a="1+1"; //variables(string)
>>
>> //how can arithmetic variables(string) ??
>> //N ROW................
>>
>> //output
>> echo $a //i need output "2" not "1+1"
>> //Please , Thank You Very Much !!
>> ?>
>>
>
> You can do:
>
> eval("echo $a;");

you realise Sunny stopped reading at this point.
some people should not be given guns. ;-)

>
> But be warned, this has "Injection Attack" written all over it!
>
> Col
>

On 10/18/07, Jochem Maas <jochem@iamjochem.com> wrote:
>
> Colin Guthrie wrote:
> > LKSunny wrote:
> >> <?
> >> $a="1+1"; //variables(string)
> >>
> >> //how can arithmetic variables(string) ??
> >> //N ROW................
> >>
> >> //output
> >> echo $a //i need output "2" not "1+1"
> >> //Please , Thank You Very Much !!
> >> ?>
> >>
> >
> > You can do:
> >
> > eval("echo $a;");
>
> you realise Sunny stopped reading at this point.
> some people should not be given guns. ;-)


a much safer technique is to restrict the options on the input and define a
custom function that
has expectations based upon those restrictions:

function addStringPieces($stringWAddition) {
$addComponents = explode('+', $stringWAddition);
return $addComponents[0] + $addComponents[1];
}
php > echo addStringPieces('1+1');
2

-nathan