How to combine three arrays with [0] as key into one - php

Question

How can i turn this array:
Array ( [0] => 80 ) Array ( [0] => 20 ) Array ( [0] => 90 )
Into such array:
Array (
[0] => 80,
[1] => 20,
[2] => 90
);
Code:
$percentage_result = $percentage_query->result_array(); //output below:
Output:
Array
(
[0] => Array
(
[id] => 62
[list_id] => 55
[start_date] => 1459987200
[end_date] => 1459987200
[percentage] => 80
)
[1] => Array
(
[id] => 64
[list_id] => 55
[start_date] => 1459814400
[end_date] => 1459814400
[percentage] => 20
)
[2] => Array
(
[id] => 63
[list_id] => 55
[start_date] => 1459900800
[end_date] => 1459900800
[percentage] => 90
)
I want to save all of the [percentage] and get the highest one.
Doing this:
$null = array();
foreach ($percentage_result as $ptime) {
//Days between start date and end date -> seasonal price
$start_time = $ptime['start_date'];
$end_time = $ptime['end_date'];
$percentage_sm = explode(',', $ptime['percentage']);
$mrg = array_merge($null, $percentage_sm);
print_r($mrg);
$msg shows me:
Array
(
[0] => 80
)
Array
(
[0] => 20
)
Array
(
[0] => 90
)

Answer 1

You can do this in very simple way like this
$percentage_sm = array(); //define blank array
foreach ($percentage_result as $ptime) {
//Days between start date and end date -> seasonal price
$start_time = $ptime['start_date'];
$end_time = $ptime['end_date'];
$percentage_sm[] = $ptime['percentage']; //assign every value to array
}
print_r($percentage_sm);

Answer 2

Use array_merge()
$result = array_merge($arr1, $arr2, $arr3);
print_r($result);

Answer 3

If you want to get the highest percentage value from your $percentage_result array, then the easiest way to do it is
$maxPercentage = max(array_column($percentage_result, 'percentage'));
rather than trying to do something weird with array_merge
(PHP >= 5.5.0)
If you're running a lower version of PHP, then you can do something similar with
$maxPercentage = max(
array_map(
$percentage_result,
function ($value) { return $value['percentage']; }
)
);