PHP :: I am trying to print an 8x8 grid

Question

I am trying to print an 8x8 grid on php can anyone check this code is I am doing something wrong

      $row = 0;
  $col = 0;

   print "<form>";
  while ($row <= 8){
      print "<tr>";
   $row++;

     while ($col <= 8){
    print "<td>"; 
    print "<input type="checkbox" name="battle" value="ships">";
    print "</td>";
    $col++;

  }


  print "</tr>";
   )
   print "</form>";

Answer 1

Use while($row < 8) and while($col < 8) (instead of <=) or else you will be printing a 9x9 table.

Use single quotes for checkbox, battle, and ships. The outside quotation marks will treat the expression as "<input type=" , checkbox, " name=", battle, " value=", ships, ">" (a syntax error) if you use double quotes on the inside.

For syntax problems, it helps to use an IDE - a good one in the browser would be ideone.com. You can enable syntax highlighting.

Answer 2

Several issues.. a couple stick out:

You're using the condition $col <= 8. This will iterate 9 times if your value starts at 0, because 0 through 8 is 9 numbers. When working with base 0 and counting up finitely, always use just < (less than) your max as that basically makes your ending number one less, making up for the 0 base.

Your last closing parenthesis should be a closing brace. You start the while with a {, so you need to finish it with a }, not ).

Answer 3

$out = "<tr>";
for($i = 0; $i < 8*8; $i++){

    if($i && $i % 8 == 0)
        $out .= "</tr><tr>";

    $out .= "<td>..</td>";
}
$out .= "</tr>";

echo $out;

Answer 4

Few mistakes. Right code should be following:

$row = 0;
print "<form>";
print "<table>";
while ($row < 8){ // Counts to 8. (from 0...7 = 8 times. 0 ... 8 = 9 times)
   print "<tr>";
   $row++;
   $col = 0; // reset column to 0 each time printing one row.

   while ($col < 8){
    print "<td>"; 
    print "<input type=\"checkbox\" name=\"battle\" value=\"ships\">"; 
     // Add \ before " otherwise it will treat as the end of the quote.
    print "</td>";
    $col++;
   }

   print "</tr>";
}
print "</table>";
print "</form>";

Hope this helps.