Php determines the minimum date of a month

Php determines the minimum date of a month, for example, the date in an array: 2014-01-01,2014-01-02,2014-01-22,2014-02-22,2014-02-26,2014-03-03,2014-03-25 ,2014-03-28

To reach: obtain the minimum date in the month, as shown below:

2014-01-01

2014-02-22

2014-03-

And calculate the number of days of the month: (for example, there are 3 in February (2014-01-01,2014-01-02,2014-01-22 ))

September-"3

September-"2

September-"3

These two functions are written separately. Thank you !!!!!!!!!

Reply to discussion (solution)

$ar = array(  '2014-01-01',  '2014-01-02',  '2014-01-22',  '2014-02-22',  '2014-02-26',  '2014-03-03',  '2014-03-25',  '2014-03-28',);$r1 = $r2 = array();foreach($ar as $d) {  list($y, $m, $d) = explode('-', $d);  if(! isset($r1[$y.$m])) $r1[$y.$m] = 32;  $r1[$y.$m] = min($r1[$y.$m], $d);  if(! isset($r2[$y.$m])) $r2[$y.$m] = 0;  $r2[$y.$m]++;}print_r($r1);print_r($r2);

Array
(
[201401] => 01
[201402] => 22
[201403] => 03
)
Array
(
[201401] => 3
[201402] => 2
[201403] => 3
)

1.

$arr = array('2014-01-01','2014-01-02','2014-01-22','2014-02-22','2014-02-26','2014-03-03','2014-03-25','2014-03-28');sort($arr);$out = array();foreach ($arr as $key => $value) {$mouth = date('n',strtotime($value));if(!in_array($mouth, array_keys($out))) $out[$mouth] = $value;}var_dump($out);

2.

$arr = array('2014-01-01','2014-01-02','2014-01-22','2014-02-22','2014-02-26','2014-03-03','2014-03-25','2014-03-28');$newArr = array_map('cout', $arr);function cout($n){return date('n',strtotime($n));}print_r ( array_count_values ( $newArr ));

Relatively simple

$arr = array('2014-01-01','2014-01-02','2014-01-22','2014-02-22','2014-02-26','2014-03-03','2014-03-25','2014-03-28');$data = array();foreach($arr as $_arr){    list($y, $m, $d) = explode('-', $d);    $data[$m] = isset($data[$m])  ? ($data[$m]>$d ? $d : $data[$m]) : $d;}

If you want to consider the same month in different years, for example, 2014-02 and 2013-02, you need to separate statistics. The key value must be in Y-m format.

 $val){        echo date('Y-m-d',$val).'
';    }}function month_days($months){    $tmp = array();    foreach($months as $month){        $key = date('Y-m',strtotime($month));        isset($tmp[$key])? $tmp[$key]++ : $tmp[$key]=1;    }    foreach($tmp as $key=>$val){        echo $key.'->'.$val.'
';    }}?>