count value occurance and group by date - php

Question

I get this date from datebase
Array
(
[0] => Array
(
[page] => login
[timestamp] => 2013-11-06 12:06:30
)
[1] => Array
[page] => changepage
[timestamp] => 2013-11-06 12:06:31
)
and so on..
I want to count the entries from the same day to make
Array
(
[0] => Array
(
[timestamp] => 2013-11-06 // only by the same day..
[count] => 4
)
)
or even
Array
(
[0] => Array
(
[timestamp] => 2013-11-06
[login] => 2
[changepage] => 4
)
)
I've tried
function format($data)
{
$dates = array();
for ($i = 0; $i < count($data); $i++)
{
if ($data[$i]['page'] == 'login')
{
if (!isset($dates[explode(' ', $data[$i]['timestamp'])[0]]))
array_push($dates, array('date' => explode(' ', $data[$i]['timestamp'])[0], 'login' => 1));
else
{
foreach ($dates as $date) {
if ($date['date'] == explode(' ', $data[$i]['timestamp'])[0])
$date['login'] += 1;
}
}
}
return $dates;
}
but that gives me only one record of
Array( Array ( 'timestamp' => '2013-11-06', 'login' => 1) )
In conclosion I want to sum the entries with the same day and same page
(My best solution would be getting 2 arrays one with sum of all the pages and one with detailed page sum)

Answer 1

Here's the solution to your question:
function format($data) {
$result = array();
foreach ($data as $item) {
$date = substr($item['timestamp'], 0, 10);
#$result[$date]['timestamp'] = $date;
#$result[$date][$item['page']]++;
}
sort($result);
return $result;
}
For each item in the array, it first truncates the time part of the timestamp field using substr. Use the date value as the key of the result array, add a timestamp field using this same date value, and increase the value of the other fields (containing page names). I use # operator here to prevent the Notice error when the key (index) doesn't exist yet.
After all items have been processed, sort the result array to change the keys into numeric indices and it becomes a regular array.
Here's the test I run:
$data = array(
array(
'page' => 'login',
'timestamp' => '2013-11-06 12:06:30'
),
array(
'page' => 'changepage',
'timestamp' => '2013-11-06 12:06:45'
),
array(
'page' => 'login',
'timestamp' => '2013-11-06 13:06:30'
),
array(
'page' => 'changepage',
'timestamp' => '2013-11-06 14:06:45'
),
array(
'page' => 'changepage',
'timestamp' => '2013-11-06 14:06:50'
),
array(
'page' => 'login',
'timestamp' => '2013-11-07 12:06:30'
),
array(
'page' => 'changepage',
'timestamp' => '2013-11-07 12:06:45'
)
);
print_r(format($data));
Anda the output is:
Array
(
[0] => Array
(
[timestamp] => 2013-11-06
[login] => 2
[changepage] => 3
)
[1] => Array
(
[timestamp] => 2013-11-07
[login] => 1
[changepage] => 1
)
)
There, hope it helps!