key() Behavioral Differences PHP5.1.6 to PHP5.2.5

[fuzzy1]

Hey all!
This little script works fine (iterating through MD array) in PHP5.2.5 on development server, but when I publish to production server (PHP5.1.6) it doesn't work (just loops through first sub -- over and over...). The problem appears to hinge on "$new_state= key($cities);" but I can't figure out why, and am stumped as to an alternative.
HELP!:eek:
P.S. You should be able to load this up and give it a whirl !

<?php
$state="AL";//start value
$city="auburn";//start value
if($_GET['state']){
	$state=$_GET['state'];
	$city=$_GET['city'];
}
$cities= Array(
  'AL' => Array (
    '1' => Array ( 'city' => 'auburn', 'url' => 'http://auburn.mydomain.com/'),
    '2' => Array ( 'city' => 'birmingham', 'url' => 'http://bham.mydomain.com/'),
    '3' => Array ( 'city' => 'columbus, GA', 'url' => 'http://columbusga.mydomain.com/')//border town
   ),
  'AK' => Array ( 'city' => 'anchorage', 'url' => 'http://anchorage.mydomain.com/'),
  'AZ' => Array (
    '1' => Array ( 'city' => 'flagstaff / sedona', 'url' => 'http://flagstaff.mydomain.com/'),
    '2' => Array ( 'city' => 'mohave cnty', 'url' => 'http://mohave.mydomain.com/')
   )
);

foreach($cities as $key=>$value){
	if($key != $state){continue;}//itterate until it does...
	$count= count($value);
	if($value['city']==''){ //e.g. more than one city this state...
	foreach($value as $c_num=>$c_val){
		if($c_val['city']!=$city){continue;}
			else{//OPTION A
				if($c_num< $count){//e.g more cities this state
					$condition= "A";
					$i=$c_num+1;
					$new_city = $value[$i]['city'];
					$new_url = $value[$i]['url'];
					break;
				}
				else{//NEW STATE -- OPTION B
					$condition= "B";
					$new_state = key($cities);//WORKS on PHP5.2.5 development server, but not in PHP5.1.6 production
					$new_city = $cities[$new_state]['1']['city'];
					$new_url=$cities[$new_state]['1']['url'];
					if($new_city==''){//e.g only ONE city this new_state
					$condition= "B1";
						$new_city=$cities[$new_state]['city'];
						$new_url=$cities[$new_state]['url'];
					}
					break;
				}
			}
		}
	}//end if more than one city this state...
	else{//only ONE city this state...
		$condition= "C";
		$new_state = key($cities);//WORKS on PHP5.2.5 development server, but not in PHP5.1.6 production
		$new_city = $cities[$new_state]['1']['city'];
		$new_url=$cities[$new_state]['1']['url'];
		if($new_city==''){
			$condition= "C1";
			$new_city=$cities[$new_state]['city'];
			$new_url=$cities[$new_state]['url'];
		}
		break;
	}
}//end foreach $cities
if($new_state=='')$new_state=$state;
echo "CONDITION =".$condition."<br>";
echo "Previous State=".$state."<br>";
echo "Previous City=".$city."<br>";
echo "New State=".$new_state."<br>";
echo "New City=".$new_city."<br>";
echo "<a href='test.php?state=$new_state&city=$new_city'>Next Iteration</a>";
?>

[NogDog]

I don't know why it would be any different; but the obvious work-around (obvious unless I'm missing something) would be to use the $key variable that you set in your foreach(), instead.

[fuzzy1]

NogDog!

NogDog;10913765 wrote:

I don't know why it would be any different; but the obvious work-around (obvious unless I'm missing something) would be to use the $key variable that you set in your foreach(), instead.

Just the expert I was hoping to hear from, but ... use the $key variable HOW exactly "$new_state = $key;" isn't going to work. I guess I don't understand your meaning.😕

[NogDog]

I don't see why it wouldn't work. Did you try it?

For a simple example:

<?php
$foo = array(
   1 => 'one',
   2 => 'two',
   3 => 'three'
);
foreach($foo as $key => $value)
{
   printf("<p>key: &#37;d, value: %s</p>\n", $key, $value);
}
?>

Output:

key: 1, value: one

key: 2, value: two

key: 3, value: three

Is there some other behavior you are expecting/needing?

[fuzzy1]

NogDog;10913789 wrote:

I don't see why it wouldn't work. Did you try it?

Is there some other behavior you are expecting/needing?

Well....yes on both counts. Let me offer a little context.
The start values are returned from a DB SELECT query, which is immediately followed by an UPDATE query
-- posting the new_values to the record to become the start values next time the script is called.
Some code is then executed on basis of the original start values, and we exit the script.

The problem lies in some inconsistencies between versions and how they handle moving the array pointer in a foreach loop.

In this context (by design) $key is is equal to the value of the current $state variable

if($key != $state){continue;}//itterate until it does... 

The behavior desired, is that $new_state = the value of the NEXT key in the array, and given the architecture of the $cities array, next($cities) won't work. Unfortunately, your example ignores (or understandably misses) the context.