how to group together arrays based on a value in php? - php

Question

I have thee following $array:
Array
(
[0] => Array
(
[cd] => 1675
[amt_1] => 199.50
[fname] => Joe
[lname] => A
)
[1] => Array
(
[cd] => 1675
[amt_1] => 69.90
[fname] => Joe
[lname] => A
)
[2] => Array
(
[cd] => 1676
[amt_1] => 69.90
[fname] => Tracy
[lname] => A
)
[3] => Array
(
[cd] => 1676
[amt_1] => 199.50
[fname] => Tracy
[lname] => A
)
...
)
I am trying to do is to group them together, in this case, by fname or cd so that i will have something like:
[0] => Array
(
[cd] => 1676
Array
(
[0] => Array
(
[amt_1] => 199.50
)
[1] => Array
(
[amt_1] => 69.90
)
[fname] => Joe
[lname] => A
)
[1] => Array
(
[cd] => 1676
Array
(
[0] => Array
(
[amt_1] => 199.50
)
[1] => Array
(
[amt_1] => 69.90
)
[fname] => Tracy
[lname] => A
)
........
I can't seem to figure it out.
This cannot be done in mysql, I need to do it in php.
Any ideas?
Thanks
edit: I know that the result example is not formatted correct, but basically I want to combine the fname and the rest of results place them in arrays.
edit:
#Paulo H has a good idea. also i found another way of doing it that groups it together not combining it :
$groups = array ();
foreach ( $the_array as $item ) {
$key = $item ['fname'];
if (! isset ( $groups [$key] )) {
$groups [$key] = array ('items' => array ($item ), 'count' => 1 );
} else {
$groups [$key] ['items'] [] = $item;
$groups [$key] ['count'] += 1;
}
}

Answer 1

Try this:
function &array_group_value_by($input_array,$value,$by){
$result = array();
foreach($input_array as $array){
if(!isset($result[$array[$by]])){
$result[$array[$by]] = array();
}
foreach($array as $key=>$data){
if((is_string($value) && $key==$value) || (is_array($value) && in_array($key,$value))){
if(!isset($result[$array[$by]][$key])){
$result[$array[$by]][$key] = array();
}
$result[$array[$by]][$key][] = $data;
}else{
$result[$array[$by]][$key] = $data;
}
}
}
return $result;
}
$grouped = array_group_value_by($yourarray,'amt_1','fname');
print_r($grouped);