<?php
define( 'wlen', 7);

list( $now_yy, $now_mm, $now_dd)=explode( '-', date('Y-m-d'));          //echo $now_yy,$now_mm,$now_dd;
list( $wpos, $mlast)=explode( '-', date('w-t', mktime( 0, 0, 0, $now_mm, 1, $now_yy))); //mktime: any arguments thus omitted will be set to the current value according to the local date and time.
$wpos=(int)$wpos;
$mlast=(int)$mlast;

echo'<table border="1"><tr>';
for( $wi=0; $wi < $wpos; $wi++) echo '<td> </td>';

for( $di=1; $di<= $mlast; $wi++, $di++) {
        if( $wi%wlen==0)echo'</tr><tr>';
        echo '<td>',$di,'</td>';
}

for( $ri=$wi%wlen; $ri<wlen; $ri++) echo '<td> </td>';

echo '</tr></table>';
?>