php中给定日期的第一天

Question

to get the first day of a given month , i have used strtotime like above but it does'nt work i write :

   $d = date_parse_from_format("d-m-Y", $date);
   $month= $d["month"];
   $year=$d["year"];
   echo date("d-m-Y", strtotime('FIRST DAY OF $month $year'));

Answer 1

The first day of this month can be expressed as

echo date('Y-m-01');

You can then extract further information from this if you require, for example the day of the week:

$month = '10';
$year  = '2012';
echo date('D', strtotime("{$year}-{$month}-01"));

Answer 2

我希望它能起作用：

echo date("j", strtotime('FIRST DAY OF $month $year'));