Grouping multidimensional array by two values - php

Question

I have arrays like this.
[11] => Array
(
[transactioncurrencyid] => Array
(
[!name] => US Dollar
[!] => {041E3DC9-D938-DD11-982C-0013724C58B7}
)
[smi_processingmonth] => Array
(
[!date] => 6/1/2011
[!time] => 2:27 PM
[!] => 2011-06-01T14:27:00-07:00
)
[smi_cchistoryid] => {678C5036-9EAA-E111-88E0-00155D010302}
[smi_includeindeal] => Array
(
[!name] => No
[!] => 0
)
[smi_locationid] => Array
(
[!name] => 1134 Hooksett Rd
[!] => {5CC1585B-91AA-E111-88E0-00155D010302}
)
)
[12] => Array
(
[transactioncurrencyid] => Array
(
[!name] => US Dollar
[!] => {041E3DC9-D938-DD11-982C-0013724C58B7}
)
[smi_processingmonth] => Array
(
[!date] => 5/1/2011
[!time] => 2:27 PM
[!] => 2011-05-01T14:27:00-07:00
)
[smi_cchistoryid] => {688C5036-9EAA-E111-88E0-00155D010302}
[smi_includeindeal] => Array
(
[!name] => No
[!] => 0
)
[smi_locationid] => Array
(
[!name] => 1134 Hooksett Rd
[!] => {5CC1585B-91AA-E111-88E0-00155D010302}
)
)
How can i group them by location id then by smi_processingmonth
So I get something like this
[1134 Hooksett Rd] => Array
(
[ 5/1/2011] = array(
[transactioncurrencyid] => Array
(
[!name] => US Dollar
[!] => {041E3DC9-D938-DD11-982C-0013724C58B7}
)
[smi_processingmonth] => Array
(
[!date] => 5/1/2011
[!time] => 2:27 PM
[!] => 2011-05-01T14:27:00-07:00
)
[smi_cchistoryid] => {688C5036-9EAA-E111-88E0-00155D010302}
[smi_includeindeal] => Array
(
[!name] => No
[!] => 0
)
[smi_locationid] => Array
(
[!name] => 1134 Hooksett Rd
[!] => {5CC1585B-91AA-E111-88E0-00155D010302}
)
)
[1/1/2011] = array(
[transactioncurrencyid] => Array
(
[!name] => US Dollar
[!] => {041E3DC9-D938-DD11-982C-0013724C58B7}
)
[smi_processingmonth] => Array
(
[!date] => 6/1/2011
[!time] => 2:27 PM
[!] => 2011-06-01T14:27:00-07:00
)
[smi_cchistoryid] => {678C5036-9EAA-E111-88E0-00155D010302}
[smi_includeindeal] => Array
(
[!name] => No
[!] => 0
)
[smi_locationid] => Array
(
[!name] => 1134 Hooksett Rd
[!] => {5CC1585B-91AA-E111-88E0-00155D010302}
)
)
)
I have tried
foreach($array as $keys)
{
$key = $keys['smi_processingmonth']['!date'];;
if (!isset($groups[$key]))
{
$groups[$key] = array($keys);
} else {
$groups[$key][] = $keys;
}
}
$newGroups = array();
if(is_array($groups))
{
foreach($groups as $cats => $values)
{
foreach($values as $itemValues){
$st = rtrim(trim($itemValues['smi_locationid']['!']));
$key = $st;
if (!isset($newGroups[$key]))
{
$newGroups[$key] = array($groups);
} else {
$newGroups[$key][] = $itemValues;
}
}
}
}
Thanks!

Answer 1

Taking from Johan with a few modifications:
avoid ltrim if already using trim
put in a function, I can use temporary variables to maintain readability
add a final [], to avoid nasty $name/$date collision, out of original request, but safer
function compactArray($data)
{
$new_structure = array();
foreach ( $data as $row )
{
$name = trim($row['smi_locationid']['!name']);
$date = trim($row['smi_processingmonth']['!date']);
$new_structure[ $name ][ $date ][] = $row;
}
return $new_structure;
}

Answer 2

Ehm, i have not tested it. But isn't it just:
$new_structure = array();
foreach ( $data as $row ) {
$key1 = rtrim(trim($row['smi_locationid']['!name']));
$key2 = rtrim(trim($row['smi_processingmonth']['!date']));
$new_structure[$key1][$key2] = $row;
}
This code could use some isset()s, but i decided to keep them out for clarity.

Answer 3

The following produces your desired output array, correctly sorted:
function transaction_datecmp($tran1, $tran2)
{
return strtotime($tran1['smi_processingmonth']['!']) -
strtotime($tran2['smi_processingmonth']['!']);
}
$output_arr = array();
foreach ($input_arr as $transaction) {
$location = $transaction['smi_locationid'] ['!name'];
$date = $transaction['smi_processingmonth']['!date'];
$output_arr[$location][$date] = $transaction;
}
ksort($output_arr); // sorts by location
foreach ($output_arr as &$transaction_arr) {
uasort($transaction_arr, 'transaction_datecmp');
}
Your data structure relies on the assumption that there cannot be two transactions on the same day, which is a somewhat dangerous assumption. Also using a location as a key is far from ideal (because of spelling, location changes, etc.) - unless it really should group things, like for paper mailing.
Data cleanup, like trimming strings, should be done beforehand, ideally at data input time.