Sum values in array and simplify key names - php

Question

This is almost similar to my other question which is related to the same project I'm working on.. Link to my other question
but in this case the array is different as follow:
Array
(
[2014-08-01 11:27:03] => 2
[2014-08-01 11:52:57] => 2
[2014-08-01 11:54:49] => 2
[2014-08-02 11:59:54] => 4
[2014-08-02 12:02:41] => 2
[2014-08-05 12:09:38] => 4
[2014-08-07 12:23:12] => 3
[2014-08-07 12:25:18] => 3
// and so on...
)
That is my output array and in order to get that array I had to do some miracles... anyway, so based on that array I have to sum the value for each key date and build an array something like this...
Array
(
[2014-08-01] => 6
[2014-08-02] => 6
[2014-08-05] => 4
[2014-08-07] => 6
// and so on...
)
That last array will be use to build graphs with morrisonJS, what I have is this:
$res_meno = array();
foreach ($sunArr as $keys => $values) {
$arrays= explode(" ",$sumArr[$keys]);
$res_meno[] = $arrays[0];
}
$vals_char2 = array_count_values($res_meno);
That is my attempt to build my last array but is not working...
any help would be greatly appreciated!
Thank you for taking the time.

Answer 1

Try this code
<?php
$arr = array(
"2014-08-01 11:27:03" => 2,
"2014-08-01 11:52:57" => 2,
"2014-08-01 11:54:49" => 2,
"2014-08-02 11:59:54" => 4,
"2014-08-02 12:02:41" => 2,
"2014-08-05 12:09:38" => 4,
"2014-08-07 12:23:12" => 3,
"2014-08-07 12:25:18" => 3
);
$new_array = array();
foreach($arr as $k => $v){
$date = reset(explode(" ", $k));
if(isset($new_array[$date])){
$new_array[$date] += $v;
}
else{
$new_array[$date] = $v;
}
}
print_r($new_array);
?>
DEMO

Answer 2

$sunArr = array
(
"2014-08-01 11:27:03" => 2,
"2014-08-01 11:52:57" => 2,
"2014-08-01 11:54:49" => 2,
"2014-08-02 11:59:54" => 4,
"2014-08-02 12:02:41" => 2,
"2014-08-05 12:09:38" => 4,
"2014-08-07 12:23:12" => 3,
"2014-08-07 12:25:18" => 3,
);
$res_meno = array();
foreach ($sunArr as $keys => $values) {
$arrays= explode(" ",$keys);
if(isset($res_meno[$arrays[0]]))
{
$res_meno[$arrays[0]] = $res_meno[$arrays[0]] + $values;
}
else
{
$res_meno[$arrays[0]] = $values;
}
}
print_r($res_meno);
exit;
Try this, i think it might fix the problem

Answer 3

Try this PHP Code You Can test here
$sunArr = Array
(
'2014-08-01 11:27:03' => 2,
'2014-08-01 11:52:57' => 2,
'2014-08-01 11:54:49' => 2,
'2014-08-02 11:59:54' => 4,
'2014-08-02 12:02:41' => 2,
'2014-08-05 12:09:3' => 4,
'2014-08-07 12:23:12' => 3,
'2014-08-07 12:25:18' => 3
);
$key = 0;
$res_meno = array();
foreach ($sunArr as $keys => $values)
{
$ar= explode(" ", $keys);
if( $key == $ar[0] )
{
$res_meno[$key] = $sunArr[$keys] + $res_meno[$key];
}
else
{
$key = $ar[0];
$res_meno[$key] = $values;
}
}
echo '<pre>';
print_r($res_meno);
die;

Answer 4

Where does the first array come from? If it's from a SQL database, it's better to create a query that returns the aggregated array.
Otherwise no need to use array_key_values for that:
$res_meno = array();
foreach ($sumArr as $keys => $values) {
$key = substr($keys, 0, 10);
$res_meno[$key] = (empty($res_meno[$key]) ? 0 : $res_meno[$key]) + $values;
}

Answer 5

Here is a solution which uses a callback. Not to use loops is often better!
$sunArr = array(
'2014-08-01 11:27:03' => 3,
'2014-08-01 11:27:05' => 5,
'2013-09-01 11:01:05' => 1
);
$res = array();
function map($item, $key, &$result)
{
$result[current(explode(" ", $key))] += $item;
}
array_walk($sunArr, "map", &$res);
var_dump($res);
You can test it here on codepad.