How To get First Date And Last Date of current Week ?

<?php

if(date('D')!='Mon')
{  
//take the last monday
$staticstart = date('Y-m-d',strtotime('last Monday'));
}else{
$staticstart = date('Y-m-d');  
}
if(date('D')!='Sat')
{
$staticfinish = date('Y-m-d',strtotime('next Saturday'));
}else{
$staticfinish = date('Y-m-d');
}
echo "First Date of Current week - ".$staticstart."</br>";
echo "Last Date of Current week - ".$staticfinish."</br>";

?>