// 今天4月15号
//获取当前月份天数
$j = date("t");
//获取本月第一天时间戳
$start_time = strtotime(date('Y-m-d'));
$array = array();
//赋值每天的日期
for($i=0; $i<$j; $i++)
{
$array[] = date('m-d',$start_time+$i*86400);
}
print_r($array);
Array
(
[0] => 2020-04-15
[1] => 2020-04-16
[2] => 2020-04-17
[3] => 2020-04-18
[4] => 2020-04-19
[5] => 2020-04-20
[6] => 2020-04-21
[7] => 2020-04-22
[8] => 2020-04-23
[9] => 2020-04-24
[10] => 2020-04-25
[11] => 2020-04-26
[12] => 2020-04-27
[13] => 2020-04-28
[14] => 2020-04-29
[15] => 2020-04-30
[16] => 2020-05-01
[17] => 2020-05-02
[18] => 2020-05-03
[19] => 2020-05-04
[20] => 2020-05-05
[21] => 2020-05-06
[22] => 2020-05-07
[23] => 2020-05-08
[24] => 2020-05-09
[25] => 2020-05-10
[26] => 2020-05-11
[27] => 2020-05-12
[28] => 2020-05-13
[29] => 2020-05-14
)