On Sat, 2012-09-22 at 13:13 +0200, Maciek Sokolewicz wrote:
> On 22-09-2012 12:34, Ashickur Rahman Noor wrote:
> > Hi all
> >
> > I need some help to understand a code. The code is like this
> >
> > $result = mysql_query($sSQL) or die("err: " . mysql_error().$sSQL);
> >> if($row = mysql_fetch_array($result))
> >> {
> >> foreach($row as $key =>$value){ $$key=$value;}
> >> }
> >>
> >
> > I don't get the code from the foreach loop.
> It simply assigns all values from the array to variables, which have the
> name of the keys.
>
> So basically what happens is:
> $array = array('a'=>1, 'b'=>2, 'c'=>3);
> foreach($array as $key=>$val) {
> $$key = $val;
> }
>
> will result in the creation of:
> $a = 1;
> $b = 2;
> $c = 3;
>
> $$foo means "I want a variable whose name is contained in the variable
> $foo". So if $foo has the value 'bar', then you'll actually be saying "I
> want a variable whose name is 'bar': $bar".
>
> So:
> $foo = 'bar';
> $bar = 'this works!';
>
> echo $$foo; // returns "this works!"
>
>
>
Be careful with this though. I'm working on fixing some old code that
someone wrote. They used this technique to "update" their code when it
got moved to a server where register_globals was turned off.
--
Thanks,
Ash
http://www.ashleysheridan.co.uk
