Extracting arrays into lists - php

Question

I'm trying to extract each sub array using the foreach as list command.
Updated:
I am now trying this:
foreach ($data as $element) {
list($id,$ownerid,$owner,$coords,$name,$score,$citytype,$location) = $element;
findcontinent($coords);
echo $coords;
echo '<br>';
echo $cont;
echo '<br>';}
the function I am calling is as follows. I know this function works when I statically call a specific coordinate from the array $data[0]['coords'] for example.
function findcontinent($coords){
$tc2 = explode(":",$coords);
$tcx = (int)(trim($tc2[0],"'\'"));
$tcy = (int)(trim($tc2[1],"'"));
$tcx2 = round((($tcx)*(600/383)),0);
$tcy2 = round((($tcy)*(600/360)),0);
if($tcx2 < 100) // checking for continents ending with 0
{
$tcx3 = '0';
$xtrans = substr((string)$tcx3,0,1);
}
else
{
$xtrans = substr((string)$tcx2,0,1);
}
if($tcy2 < 100) // checking for continents starting with 0
{
$tcy3 = '0';
$ytrans = substr((string)$tcy3,0,1);
}
else
{
$ytrans = substr((string)$tcy2,0,1);
}
$cont = C.$ytrans.$xtrans;
return($cont);
}
I then want to run a set of SQL commands to update a DB. Do I have the correct syntax?
My array is as follows - sample. The actual datasets could be dynamic, many individual sub arrays?
[data] => Array
(
[0] => Array
(
[id] => 16515340
[owner_id] => 3475
[owner] => Player1
[coords] => '268:252
[name] => AC2013
[score] => 11863
[city_type] => castle
[location] => land
)
[1] => Array
(
[id] => 16515335
[owner_id] => 3475
[owner] => Player1
[coords] => '263:252
[name] => AC2013
[score] => 7
[city_type] => castle
[location] => water
)
[2] => Array
(
[id] => 17891610
[owner_id] => 3523
[owner] => Player2
[coords] => '282:273
[name] => City of Repoman9900
[score] => 1978
[city_type] => castle
[location] => water
)
[3] => Array
(
[id] => 10616856
[owner_id] => 73
[owner] => Player2
[coords] => '024:162
[name] => 1killer
[score] => 1308
[city_type] => castle
[location] => water
)
[4] => Array
(
[id] => 10813465
[owner_id] => 2862
[owner] => Player3
[coords] => '025:165
[name] => City of vuvuzea991
[score] => 1091
[city_type] => castle
[location] => land
)
[5] => Array
(
[id] => 17367317
[owner_id] => 84
[owner] => Player4
[coords] => '277:265
[name] => Dreadland
[score] => 776
[city_type] => castle
[location] => water
)
[6] => Array
(
[id] => 2162850
[owner_id] => 2989
[owner] => Player5
[coords] => '162:033
[name] => City of Dinoeyez
[score] => 157
[city_type] => castle
[location] => water
)
[7] => Array
(
[id] => 2818192
[owner_id] => 556
[owner] => Player6
[coords] => '144:043
[name] => City of wildfire123
[score] => 7
[city_type] => castle
[location] => water
)
)
Since it looks like associative arrays cannot be exploded into lists, which would have been nice, trying to run this loop to extract even 1 record, and failing
$count = 0;
// loop to cycle through array
foreach($data as $data=>$inner_array){
$c2 = (string)$count;
$id = $data[$count]['id'];
echo $id;
echo '<br>';
echo $count;
echo '<br>';
//then increment counter and move to next
$count = $count+1;
}
The counters return just fine, but I cannot seem to parse any of the variables in the sub-array. Echo output is as follows:
<br>0<br><br>1<br><br>2<br><br>3<br><br>4<br><br>5<br>
The data set I am using right now is 6 sub-arrays, so I know it is going through the loop correctly.

Answer 1

foreach ($data as list($id,$ownerid,$owner,$coords,$name,$score,$citytype,$location)) {
// commands
}
Since this use of list is only allowed in the beta version of PHP, the more portable syntax requires two steps:
foreach ($data as $element) {
list($id,$ownerid,$owner,$coords,$name,$score,$citytype,$location) = $element;
// commands
}
foreach ($data=>inner_array as xxx) is not valid. The var=>var syntax is only valid after as, not before it. I'm not sure why you have nested for loops -- there's only one array you need to iterate over.
I would be very wary of using this syntax when the sub-arrays are associative arrays. List assignment is based on the order of elements in the sub-array, it doesn't try to match variable names with keys. So if you have a sub-array where the owner_id element is before the id element, the list assignment will set $id to the owner ID, and $owner_id to the ID. The order of elements in an associative array is the order they were added to the array (unless you've used a function to rearrange them, such as array_sort() or array_splice()), so unless you're sure you always add keys in the same order this can be dangerous.
UPDATE:
List assignment like this doesn't work with associative arrays. According to PHP list documentation:
list() only works on numerical arrays and assumes the numerical indices start at 0.
So you'll need to assign the variables individually:
foreach ($data as $element) {
$id = $element['id'];
$owner_id = $element['owner_id'];
// and so on
}