Simple calendar implementation

A simple calendar implementation. I don’t know if there is any problem with the implementation method of this code. I didn’t refer to my predecessors. After you understand my bad code, it will be more helpful to appreciate other people’s excellent code.

 $date = isset( $_GET['d']) ? intval($_GET['d']) : '';
 if($date)
 {
 $y = substr($date,0,4);
 $m = substr ($date,4,2);
 $cur = mktime(0,0,0,$m,1,$y);
 }
 else
 {
 $cur = mktime();
 }

 list( $year,$month,$day) = explode('-',date('Y-m-d',$cur));//Year, month and day
 $p = date('Ym',strtotime('last months' ,$cur));//The previous month
 $n = date('Ym',strtotime('next months',$cur));//The next month
 $t = date('t',$cur ); //How many days in the month
 $s = date('w',mktime(0,0,0,$month,1,$year)); //Padding blanks
 $e = 6-(date(' w',mktime(0,0,0,$month,$t,$year)));//Fill in the blanks
?>

«  yearmonth  »
< td>One< td>六 echo ''; for($i=0;$i<$s;$i++)  { echo ''; } for($d=1;$d<=$t;$d++) { $current=$d==$day ?'class="current"':'';//Current style $r = ($d+$s)%7;//Line break echo "" ; if($r==0) { echo ''; echo ''; } } for($i=0;$ i<$e;$i++) { echo ''; }?>
dayTwoThreeFourFive



 

$d

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