Rumah > Artikel > pembangunan bahagian belakang > php 判断月份中最小的日期
比如:一个数组里边装的日期:2014-01-01,2014-01-02,2014-01-22,2014-02-22,2014-02-26,2014-03-03,2014-03-25,2014-03-28
要达到:把月份中最小的日期取出来,如下所示:
2014-01-01
2014-02-22
2014-03-03
并且计算月份所属日期数:(比如1月份有3个(2014-01-01,2014-01-02,2014-01-22))
01月份-》3
02月份-》2
03月份-》3
这两个功能单独写。请大侠赐教,谢谢!!!!!!!!!
$ar = array( '2014-01-01', '2014-01-02', '2014-01-22', '2014-02-22', '2014-02-26', '2014-03-03', '2014-03-25', '2014-03-28',);$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
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);
$arr = array('2014-01-01','2014-01-02','2014-01-22','2014-02-22','2014-02-26','2014-03-03','2014-03-25','2014-03-28');$newArr = array_map('cout', $arr);function cout($n){ return date('n',strtotime($n));}print_r ( array_count_values ( $newArr ));
比较简单
$arr = array('2014-01-01','2014-01-02','2014-01-22','2014-02-22','2014-02-26','2014-03-03','2014-03-25','2014-03-28');$data = array();foreach($arr as $_arr){ list($y, $m, $d) = explode('-', $d); $data[$m] = isset($data[$m]) ? ($data[$m]>$d ? $d : $data[$m]) : $d;}
如果要考虑不同年相同月份的情况,例如2014-02 与 2013-02 需要分开统计。key的值要用Y-m格式。
<?php$months = 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');month_min_day($months);month_days($months);function month_min_day($months){ $tmp = array(); foreach($months as $month){ $key = date('Y-m',strtotime($month)); if(!isset($tmp[$key]) || strtotime($month)<$tmp[$key]){ $tmp[$key] = strtotime($month); } } foreach($tmp as $key=>$val){ echo date('Y-m-d',$val).'<br>'; }}function month_days($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.'<br>'; }}?>