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@ 2014-01-19T17:32:17Z

<?php

$input = array(
    "2014-01-20 20:00:00",
    "2014-01-21 20:00:00",
    "2014-01-22 14:00:00",
    "2014-01-22 20:00:00",
    "2014-01-23 14:00:00",
    "2014-01-23 20:00:00",
    "2014-01-25 20:00:00",
    "2014-01-26 12:00:00",
    "2014-01-26 20:00:00",
    "2014-01-31 20:00:00",
    "2014-02-01 20:00:00"
);

$timestamps = array_map("strtotime", $input);

$calendar = array();
foreach ($timestamps as $value) {
    $format = date("d.m.H", $value);
    list($day, $month, $hour) = explode(".", $format);
    
    if (!array_key_exists($month, $calendar))
        $calendar[ $month ] = array();
    
    if (!array_key_exists($day, $calendar[ $month ]))
        $calendar[ $month ][ $day ] = array();
    
    $calendar[ $month ][ $day ][] = $hour;
}

$ranges = array();
// use reference so removing objects will affect all loops
foreach ($calendar as $month => &$dates) {
    foreach ($dates as $date => $hours) {
        foreach ($hours as $key=>$hour) {
            
            // start checking for groups
            $currentDate = $date+1;
            $range = array($date);
            while (isset($dates[$currentDate]) && ($newkey = array_search($hour, $dates[$currentDate])) !== FALSE) {
                $range[] = $currentDate;
                unset($dates[$currentDate][$newkey]);
                $currentDate++;
            }
            
            // group was found
            if (count($range) != 1) {
                $ranges[] = array('dates' => $range, 'hour' => $hour);
                unset($dates[$date][$key]);
            }
        }
    }
}

print_r($calendar);
print_r($ranges);

Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Array ( [01] => Array ( [20] => Array ( ) [21] => Array ( ) [22] => Array ( ) [23] => Array ( ) [25] => Array ( ) [26] => Array ( [0] => 12 ) [31] => Array ( [0] => 20 ) ) [02] => Array ( [01] => Array ( [0] => 20 ) ) ) Array ( [0] => Array ( [dates] => Array ( [0] => 20 [1] => 21 [2] => 22 [3] => 23 ) [hour] => 20 ) [1] => Array ( [dates] => Array ( [0] => 22 [1] => 23 ) [hour] => 14 ) [2] => Array ( [dates] => Array ( [0] => 25 [1] => 26 ) [hour] => 20 ) )
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/VH43p on line 35
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/VH43p on line 35
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/VH43p on line 35
Process exited with code 255.

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