<?php
$counter=0;
$rows=0;
echo '<table class="style4">'; // main table
for ($a=1; $a<=16;$a++):
// for ($a=16; $a>=1;$a--):
for ($b=1; $b<=16;$b++):
// for ($b=3; $b<=3;$b++):
for ($c=1; $c<=16;$c++):
// for ($c=5; $c<=5;$c++):
for ($d=1; $d<=16;$d++):
// for ($d=13; $d<=13;$d++):
if ($a!==$b && $a!==$c && $a!==$d &&
$b!==$c && $b!==$d &&
$c!==$d &&
1<= 34-$a-$b-$d && 34-$a-$b-$d <=16 && // 13
1<= 34-$a-$b-$c && 34-$a-$b-$c <=16 && // 21
1<= $b-$c+$d && $b-$c+$d <=16 && // 22
1<= $a+$c-$d && $a+$c-$d <=16 //24
// the other combinatiuons are between 1 and 16 as a consequence of the above restrictions
): // conditions on the independent parameters
$square=array(
array($a ,$b ,34-$a-$b-$d ,$d ),
array($c ,34-$a-$b-$c ,$b-$c+$d ,$a+$c-$d ),
array(17-$a-$c+$d ,17-$b+$c-$d ,-17+$a+$b+$c ,17-$c ),
array(17-$d ,-17+$a+$b+$d , 17-$b ,17-$a )
);
$varification='Yes';
for ($i=0; $i<=3; $i++):
for ($j=0; $j<=3; $j++):
for ($k=0; $k<=3; $k++):
for ($l=0; $l<=3; $l++):
if( !($i==$k && $j==$l) && $square[$i][$j] == $square[$k][$l] ){ // all elements must be different
$varification='No';
};
endfor; //$l
endfor; //$k
endfor; //$j
endfor; //$i
### print squares
if($varification!=='No'){ // all conditions are fulfilled!
$counter+=1;
if($counter%4==1){ // begin a row of the main table
$rows+=1;
echo '<tr style="background-color:';
if($rows%2==0){echo'#EFF2EA';}
if($rows%2==1){echo'#ECD899';}
echo';">';
};
if($counter==370){echo'<td style="background-color:yellow">';} // the Dures square is in yellow
else{echo '<td>';};
echo "<span style=\"color:green; font-size: 12px;\"><span style=\"color:black;font-size: 15px;\">No.$counter</span> (a=$a, b=$b, c=$c, d=$d)</span>";
echo '<table class="style4">'; // the table with the square - BEGINNING
for ($i=0; $i<=3; $i++):
echo '<tr>';
for ($j=0; $j<=3; $j++):
echo '<td>'.$square[$i][$j].'</td>';
endfor; //$j
echo '</tr>';
endfor; //$i
echo'</table>'; // the table with the square - END
echo '</td>';
if($counter%4==0){echo '</tr>';}; // end a row of the main table
}; // all conditions are fulfilled!
endif; // conditions on the independent parameters
endfor; //$d
endfor; //$c
endfor; //$b
endfor; //$a
echo'</table>'; // main table
?>
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