Re: Assign by reference...

Yes, I think Rasmus is right. You are reseting your reference on line 5. It seems to me when you assign a new array to $mult_arr, it's address stays the same. Thus all entries in $multiples_arr point to the same array (your last one). I think you were trying to use $mult_arr as your temporary variable. Then, when you assigned a new array, you thought that it would just point to a new memory location. However, as your example shows, it just reset the values and put new ones into same memory. (I think your example would work great in Java). I am not sure how to make $mult_arr be a temp var and get new mem location on each assignment; lets wait for the PHP authors to update the documentation. Try this, this gave me what you wanted. 1 $num_arr = array(1, 2, 3); 2 $multiples_arr = array(); 3 while (list($key, $val) = each($num_arr)) 4 { 5 $mult_arr[$key] = array($val, $val*10, $val*100); 6 $multiples_arr[] = &$mult_arr[$key]; 7 } 8 9 while (list($key, $mult_arr) = each($multiples_arr)) 10 { 11 print join(",",$mult_arr)."<BR>\n"; 12 } Output: X-Powered-By: PHP/4.0.0 Content-type: text/html 1,10,100<BR> 2,20,200<BR> 3,30,300<BR> Benjamin Berman wrote: > I'm having a problem with the new assign by reference feature in PHP4. > Consider the following code; it's an artificial example that takes an > array of numbers, for instance (1,2,3) and transforms it into an array > of arrays, where each array contains multiples of the original number, > for instance ((1,10,100), (2,20,200), (3, 30, 300)). Here is the code: > > 1 $num_arr = array(1, 2, 3); > 2 $multiples_arr = array(); > 3 while (list($key, $val) = each($num_arr)) > 4 { > 5 $mult_arr = array($val, $val*10, $val*100); > 6 $multiples_arr[] = &$mult_arr; > 7 } > 8 > 9 while (list($key, $mult_arr) = each($multiples_arr)) > 10 { > 11 print join(",",$mult_arr)."<BR>\n"; > 12 } > > I would expect to get the output: > > 1,10,100 > 2,20,200 > 3,30,300 > > But instead, I get the following: > > 3,30,300 > 3,30,300 > 3,30,300 > > This is counter-intuitive with respect to other programming languages > I've used. I can guess what's happening underneath to make PHP display > this behavior, but it still seems to contradict my notion of what > "assignment by reference" means. Is there any way to get PHP to do what > I want it to do here? > > Thanks, > ben. > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net