求个PHP列出周末期代码

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------解决方案--------------------

//打印周五
$week = getdate();
//echo $week['wday'];
if($week['wday']==5)
//echo $week['year'].'年'.$week['mon'].'月'.$week['mday'].'日';
//echo $week[year].'年'.$week[mon].'月'.$week[mday].'日';

for($i=1;$i<=20;$i++)
{
$j=$i*-7;
$k=$j+7;
echo date("Y年m月d日",strtotime($j." days"));
echo "->".date("Y年m月d日",strtotime($k." days"));
echo "
";
}
?>

代码写得很粗糙
------解决方案--------------------

$s='2013-05-31';
$current=date("Y-m-d");
while($current>=$s){
    $ar[]=$current;
	$current=date("Y-m-d",strtotime("$current -7 day"));
}
	for($i=0;$i	   echo $ar[$i+1].'->'.$ar[$i]."\n";
	}

------解决方案--------------------

for($i=0,$t=-7; $i<20; $i++,$t-=7) {
  echo date('Y-m-d -> ', strtotime("$t day"));
  echo date('Y-m-d', strtotime(($t+7)."day")) . '
';
}