Working with arrays to produce a single array - php

Question

I have an array that can have many values at any given point, what I would like to accomplish is to combine all the array indexes and form one index with my final value. Merge other values that are the same
Say I have the array result below
Array
(
[0] => stdClass Object
(
[component] => sodium chloride
[generic_results] => Average:=99.20%
)
[1] => stdClass Object
(
[component] => sodium chloride
[generic_results] => RSD:=0.54%
)
[2] => stdClass Object
(
[component] => sodium chloride
[generic_results] => n:=3
)
)
What I would like is something like this
Array
(
[0] => stdClass Object
(
[component] => sodium chloride
[generic_results] => Average:=99.20%,RSD:=0.54%, n:=3
)
)
I have tried array unique but its not working.
Example code generating the results:
$arr=array(
(object) array(
'component'=>'sodium chloride',
'generic_results'=>'Average:=99'
),
(object) array(
'component'=>'sodium chloride',
'generic_results'=>'RSD:=0.54'
),
(object) array(
'component'=>'sodium chloride',
'generic_results'=>'n:=3'
)
);
print('<pre>');
print_r($arr);
print('</pre>');
Any Suggestions for this problem?

Answer 1

Try this
$new = array();
foreach ($array as $obj){
// By setting the key you guarantee it being unique
$new[$obj->component][$obj->generic_results] = $obj->generic_results;
}
$new2 = array();
foreach ($new as $comp=>$arr){
$new2['component'][$comp] = implode(',',$arr);
}
This will return an array but you can (although its not always sufficient) then use json_decode(json_encode($new2), false) to convert it to the object. Hope that helps.

Answer 2

You can use array_reduce, which iterates over an array to combine all elements with a given callback function:
$result = array_reduce($arr, function($result, $item) {
if ($result === null) {
// initialize with first item
return [$item];
}
// add generic_results of current item to result
$result[0]->generic_results .= ',' . $item->generic_results;
return $result;
}
);
Demo: https://3v4l.org/KBUBl