How to combine arrays from a multidimensional array and count values? - php

Question

I'm a beginner at php and was searching for a solution all day long without success.
I have the following array:
$data = Array
(
[0] => Array
(
[my_id] => 1
[my_post_id] => 123
[my_status] => 1
[my_rating] => 5
)
[1] => Array
(
[my_id] => 2
[my_post_id] => 123
[my_status] => 1
[my_rating] => 4
)
[2] => Array
(
[my_id] => 3
[my_post_id] => 123
[my_status] => 1
[my_rating] => 5
)
[3] => Array
(
[my_id] => 4
[my_post_id] => 456
[my_status] => 1
[my_rating] => 5
)
[4] => Array
(
[my_id] => 5
[my_post_id] => 456
[my_status] => 1
[my_rating] => 3
)
)
and would like to merge the arrays with the same 'my_post_id' and count the values for 'my_status' and 'my_rating' which have the same 'my_post_id'.
At the end, I would like to have the following array:
$data = Array
(
[0] => Array
(
[my_post_id] => 123
[my_status] => 3
[my_rating] => 14
)
[1] => Array
(
[my_post_id] => 456
[my_status] => 2
[my_rating] => 8
)
)
I could get arrays with unique 'my_post_id' with the following code but I couldn't find out how to count the other values.
$out = array();
foreach( $data as $row ) {
$out[$row['my_post_id']] = $row;
}
$array = array_values( $out );
Any help would be much appreciated.
Daniel

Answer 1

This will produce the array you are looking for:
$out = array();
foreach( $data as $row ) {
if (!isset($out[$row['my_post_id']])) {
$out[$row['my_post_id']] = Array( "my_id"=>$row['my_id'],
"my_status" => $row["my_status"],
"my_rating" => $row["my_rating"]);
}
else {
$out[$row['my_post_id']]["my_status"] += $row["my_status"];
$out[$row['my_post_id']]["my_rating"] += $row["my_rating"];
}
}
results in:
Array
(
[123] => Array
(
[my_id] => 1
[my_status] => 3
[my_rating] => 14
)
[456] => Array
(
[my_id] => 4
[my_status] => 2
[my_rating] => 8
)
)

Answer 2

try the following - untested code
foreach($data as $key => $val){
if(!array_search($val['my_post_id'],$newArray)){
$newArray[]=array('my_post_id' => $val['my_post_id'],
'my_status' => $val['my_status'],
'my_rating' => $val['my_rating']);
}else{
$myIndex=array_search($val['my_post_id'],$newArray);
$newArray[$myIndex]['my_status']+=$val['my_status'];
$newArray[$myIndex]['my_rating']+=$val['my_rating'];
}
}