How to convert Array using CakePHP HASH class? - arrays

Question

I am working on CakePHP. Recently I started using the CakePHP Hash Class. I want to convert an array format using the Hash Class functions.
I have the following array :
$arr = array(
0 => array(
'key1' => array(
'id' => 6
'type' => insert
'field_id' => 2
'activity' => table
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 6
)
1 => array(
'id' =>
'key1_id' => 6
)
)
)
1 => array(
'key1' => array(
'id' => 5
'type' => edit
'field_id' => 3
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 5
)
1 => array(
'id' =>
'key1_id' => 5
)
)
)
2 => array(
'key1' => array(
'id' => 4
'type' => insert
'field_id' => 2
'activity' => table
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 4
)
)
)
3 => array(
'key1' => array(
'id' => 3
'type' => insert
'field_id' => 3
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 3
)
)
)
4 => array(
'key1' => array(
'id' => 2
'type' => edit
'field_id' => 1
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 2
)
)
)
5 => array(
'key1' => array(
'id' => 1
'type' => edit
'field_id' => 3
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 1
)
)
)
);
The condition is that any key1 having type, field_id and activity exactly will result in all the key2 being merged together and the key1 that occurs later in the list gets unset.
I want to convert it into the following format :
$arr = array(
0 => array(
'key1' => array(
'id' => 6
'type' => insert
'field_id' => 2
'activity' => table
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 6
)
1 => array(
'id' =>
'key1_id' => 6
)
2 => array(
'id' =>
'key1_id' => 4
)
)
)
1 => array(
'key1' => array(
'id' => 5
'type' => edit
'field_id' => 3
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 5
)
1 => array(
'id' =>
'key1_id' => 5
)
2 => array(
'id' =>
'key1_id' => 1
)
)
)
3 => array(
'key1' => array(
'id' => 3
'type' => insert
'field_id' => 3
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 3
)
)
)
4 => array(
'key1' => array(
'id' => 2
'type' => edit
'field_id' => 1
'activity' => list
),
'key2' => array(
0 => array(
'id' =>
'key1_id' => 2
)
)
)
);
If you have a look key2 value for key '2' is merged with key '0' and '2' is unset.
The missing key values should basically be unset. I want to know the best possible way in which I can attain this format for the array.

Answer 1

What you are trying to do it's bit tricky. I recommend to achieve this by trying with some different CakePHP sql query.
Solution
$keys = Hash::extract($arr, '{n}.key1.field_id');
$vals = Hash::extract($arr, '{n}');
$result = $this->array_combine_($keys, $vals);
function array_merge_multiple(&$v) {
$z1 = array();
$z2 = array();
$len = count($v);
for ($i = 0; $i < $len; $i++) {
if ($i < ($len - 1)) {
$z1 = array_merge($v[$i]['key2'], $v[$i + 1]['key2']);
$z2 = array_merge($v[$i]['key1'], $v[$i + 1]['key1']);
} else if($len==1){
$z1 = $v[$i]['key2'];
$z2 = $v[$i]['key1'];
}
unset($v[$i]);
}
$v['key1'] = $z1;
$v['key2'] = $z2;
}
/* Modified array_combine function ( Hash::combine uses array_combine internally */
function array_combine_($keys, $values) {
$result = array();
foreach ($keys as $i => $k) {
$result[$k][] = $values[$i];
}
array_walk($result, 'array_merge_multiple');
return $result;
}