打印乘法表的垂直和水平标题

Question

I have two arrays:

$array1 = array(1,2,3,4,7,6);
$array2 = array(2,3,1,0,5);

Then I tried to create printTable function to print multiplication table for arrays:

function printTable($array1, $array2) {
  echo "<table border=1px>";
  foreach ($array2 as $vert_head) {
    echo "<tr>";
    foreach ($array1 as $hor_head) {
      echo "<td>". ($vert_head * $hor_head) ."</td>";
    }
    echo "</tr>";
  }
  echo "</table>";
}

And then print table:

$data = printTable($array1, $array2);

It works fine table is print. But how can I add horizontal and vertical header from arrays?

That how my table looks right now(just answers):

2 |  4 |  6 |  8 | 14 | 12 |
3 |  6 |  9 | 12 | 21 | 18 |
1 |  2 |  3 |  4 |  7 |  6 | 
0 |  0 |  0 |  0 |  0 |  0 |
5 | 10 | 15 | 20 | 35 | 30 |

How can I add headers:

|   | 1 |  2 |  3 |  4 |  7 |  6 |  
+---+---+----+----+----+----+----+
| 2 | 2 |  4 |  6 |  8 | 14 | 12 |
| 3 | 3 |  6 |  9 | 12 | 21 | 18 |
| 1 | 1 |  2 |  3 |  4 |  7 |  6 | 
| 0 | 0 |  0 |  0 |  0 |  0 |  0 |
| 5 | 5 | 10 | 15 | 20 | 35 | 30 |

Answer 1

I've included comments in place of modified code. It use and extra foreach loop to print heading.

<?php

$array1 = array(1,2,3,4,7,6);
$array2 = array(2,3,1,0,5);

function printTable($array1, $array2) {
  echo "<table border=1px>";

  /* In our table first cell is empty. So put a blank cell here. */
  echo '<tr><td></td>' ;

  /* Then print all headers in following cells */
  foreach($array1 as $head) {
    echo '<th>' . $head . '</th>' ;
  }
  /* close the first row */
  echo '</tr>';

  foreach ($array2 as $vert_head) {
    echo "<tr>";

    /* Before printing each row, print the left heading */
    echo '<td>' . $vert_head . '</td>' ;

    foreach ($array1 as $hor_head) {
      echo "<td>". ($vert_head * $hor_head) ."</td>";
    }
    echo "</tr>";
  }
  echo "</table>";
}