PHP include() CODING

Hello! Thanks so much in advance for any assistance. I'll get right to my question:

"Create 3 files (i.e. header.php, main.php, footer.php) and use the PHP built-in function include() to implement an HTML page with the structure showed below. Notice that the main portion of the page includes the multiplication table that you implemented for the homework assignment 3.

"

The multiplication table being discussed was an earlier assignment. Mine looks like this:

And the code I used for it is:

// Example 3

$a = 1; $b = 2; $c = 3; $d = 4; $e = 5; $f = 6; $g = 7; $h = 8; $i = 9; $j = 10;

echo "$a $b $c $d $e $f $g $h $i $j ";

echo $b," ",$b*$b," ",$c*$b," ",$d*$b," ",$e*$b," ",$f*$b," ",$g*$b," ",$h*$b," ",$i*$b," ",$j*$b," ";

echo $c," ",$b*$c," ",$c*$c," ",$d*$c," ",$e*$c," ",$f*$c," ",$g*$c," ",$h*$c," ",$i*$c," ",$j*$c," ";

echo $d," ",$b*$d," ",$c*$d," ",$d*$d," ",$e*$d," ",$f*$d," ",$g*$d," ",$h*$d," ",$i*$d," ",$j*$d," ";

echo $e," ",$b*$e," ",$c*$e," ",$d*$e," ",$e*$e," ",$f*$e," ",$g*$e," ",$h*$e," ",$i*$e," ",$j*$e," ";

echo $f," ",$b*$f," ",$c*$f," ",$d*$f," ",$e*$f," ",$f*$f," ",$g*$f," ",$h*$f," ",$i*$f," ",$j*$f," ";

echo $g," ",$b*$g," ",$c*$g," ",$d*$g," ",$e*$g," ",$f*$g," ",$g*$g," ",$h*$g," ",$i*$g," ",$j*$g," ";

echo $h," ",$b*$h," ",$c*$h," ",$d*$h," ",$e*$h," ",$f*$h," ",$g*$h," ",$h*$h," ",$i*$h," ",$j*$h," ";

echo $i," ",$b*$i," ",$c*$i," ",$d*$i," ",$e*$i," ",$f*$i," ",$g*$i," ",$h*$i," ",$i*$i," ",$j*$i," ";

echo $j," ",$b*$j," ",$c*$j," ",$d*$j," ",$e*$j," ",$f*$j," ",$g*$j," ",$h*$j," ",$i*$j," ",$j*$j," ";

?>