Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.php > #5315

Doubt regarding an array of references...

Show all headers | View raw

Hi,

I am coding a simple parser, where a construct is made of a fixed number 
sequence of  varIDs or quoted literals that may or may not be separated by 
punctuators.

In order to avoid a repetition of similar statements, I decided to try if I 
could store the references of the variables where each value should be 
stored and then perform a loop in order to extract and store the symbols.

The try was this little program:

 $a = $b = $c = "nil";
 echo "a = $a, b = $b, c = $c<br>\n";

 $d = array(&$a, &$b, &$c);
 for ($n = 0; $n < count($d); $n++) $d[$n] =  $n;
 echo "a = $a, b = $b, c = $c<br>\n";

 for ($n = 0; $n < count($d); $n++) $d[$n] =  ($n + 100);
 echo "a = $a, b = $b, c = $c<br>\n";

 $n = 200;
 foreach ($d as &$nx) $nx = $n++;;        // why &$nx ?
 echo "a = $a, b = $b, c = $c<br>\n";

The output is this:

a = nil, b = nil, c = nil
a = 0, b = 1, c = 2
a = 100, b = 101, c = 102
a = 200, b = 201, c = 202

so it works as needed.

My question is regarding the instruction with the comment.

My first try was to write  foreach ($d as $nx), since each element in the $d 
array is supposed to be already holding a reference.

I find this confusing. Wouldn't &$nx holde the reference to the array 
element, instead of the reference contained within the array element?

Thanks in advance.

--

Back to comp.lang.php | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Doubt regarding an array of references... "Leonardo Azpurua" <leonardo@exmvps.org> - 2012-04-02 11:47 -0430
  Re: Doubt regarding an array of references... "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2012-04-03 11:02 +0200
    Re: Doubt regarding an array of references... "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-04-03 13:39 +0200
      Re: Doubt regarding an array of references... Jerry Stuckle <jstucklex@attglobal.net> - 2012-04-03 08:03 -0400
        Re: Doubt regarding an array of references... "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-04-03 14:15 +0200
        Re: Doubt regarding an array of references... "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2012-04-04 10:48 +0200

csiph-web