PHP Implementation Calendar case

This article mainly introduces how to write a calendar of PHP a small case, interested in a friend's reference, I hope to be helpful to everyone.

The code is as follows:

<?php//Modify page encoding header ("content-type:text/html;    Charset=utf-8 ");    If the year is not passed, get the current system year $year =!isset ($_get[' y '))? $_get[' y ']:d ate (' Y ');    If there is no incoming month, obtain the current system month $month =$_get[' m ']?$_get[' m ']:d ate (' m ');    Gets how many days the current month $days =date (' t ', Strtotime ("{$year}-{$month}-1"));    The current 1th number is the day of the Week $week =date (' W ', Strtotime ("{$year}-{$month}-1"));        Output header echo "<center>";        echo "