Help creating multiplication and addition tables in PHP

phspanthers · September 14, 2014

I am new to php and need help creating addition and multiplication tables using the html code we were given. I feel like I am on the right track, but I am getting a few errors and I cant figure them out. One of the errors is that it tells me I am not putting in a valid number for rows even though it is a positive number so it should work. Here is my code and all help is appreciated thanks in advance.

<html>
    <head/>
    <body>
    <form method="POST" action="<?= $_SERVER['PHP_SELF'] ?>">
      <table border="1">
     <tr><td>Number of Rows:</td><td><input type="text" name="rows" /></td></tr>
     <tr><td>Number of Columns:</td><td><select name="columns">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="4">4</option>
    <option value="8">8</option>
    <option value="16">16</option>


      </select>
    </td></tr>
    <tr><td>Operation:</td><td><input type="radio" name="operation" value="multiplication"     checked="yes">Multiplication</input><br/>
    <input type="radio" name="operation" value="addition">Addition</input>
    </td></tr>
    </tr><td colspan="2" align="center"><input type="submit" name="submit" value="Generate" /></td>    </tr>
    </table>
    </form>


    <?php


        //check to see if num of rows is numberic
        if (isset($_POST["rows"]) && is_numeric($_POST["rows"])){
                //check to see if rows is a positive number
                if($_POST["rows"] > 0){


                if(isset($_POST) && $_POST['operation'] == "multiplication")
                {
                        for($r = 0; $r < $_POST["rows"]; $r++){
                                echo '<tr>';


                                for($c = 0; $c < $_POST["columns"]; $c++){
                                        echo '<td>' .$c*$r. '</td>';
                                echo '</tr>';


                                }}
                }


                else if (isset($_POST) && $_POST['operation'] == "addition")
                {
                        for($r = 0; $r < $_POST["rows"]; $r++){
                                echo '<tr>';


                                for($c = 0; $c < $_POST["columns"]; $c++){
                                        echo '<td>' .$c+$r. '</td>';
                                echo '</tr>';
                        }
                     }
                }


                }
                else{
                echo 'Invalid rows columns parameters';
                exit();
                }
        }
        else{
        echo 'Invalid rows columns parameters';
        exit();
        }


    ?>
    </body>
    </html>

Strider64 · September 14, 2014

I was bored, it isn't perfect but it works and needs to be stylized:

<?php
/* I would pull the form and table apart, by that I mean */
/* don't try to do two things at once. I haven't done    */
/* any number validation and I'm sure this needs to be   */
/* modified for I don't know what exactly the initial    */
/* HTML looked liked. 																	 */
if ( isset($_POST['submit']) && $_POST['submit'] == "Generate" ) {
	$numRows = $_POST['rows'];
	$numCols = $_POST['columns'];
	$operand = $_POST['operation'];
}


?>
<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Learning How to Multiply & Add</title>
  <style>
    table {
     border-collapse: collapse;
   }
   table, th, td {
     border: 1px solid #2e2e2e;
   }
 </style>
</head>

<body>
  <form action="" method="post">
    <label for="numRows" class="labelStyle">Number of Rows:</label>
    <input id="numRows" name="rows" value="">
    <label for="numCols" class="labelStyle">Number of Cols:</label>
    <select id="numCols" name="columns">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="4">4</option>
      <option value="8">8</option>
      <option value="16">16</option>
    </select>
    <br>
    <h3>Operation</h3>
    <input id="multiplication" type="radio" name="operation" value="multiplication" checked>
    <label for="multiplication">Multiplication</label>
    <input id="addition" type="radio" name="operation" value="addition">
    <label for="addition">Addition</label>
    <br>
    <input class="submitBtn" type="submit" name="submit" value="Generate">
  </form>
  <table class="tableStyle">
    <thead>
      <tr>
        <!-- Number of Colums and Rows are initial set to 10 -->
        <?php $columns = isset($numCols) ? $numCols : 10; ?>
        <th colspan="<?php echo $columns ?>"><?php echo $columns . " Columns"; ?></th>
      </tr>
      <tr>
        <?php
        for($x = 0; $x < $columns; $x++) {
         echo '<th>' . $x . '</th>' . "\n";
       }
       ?>
     </tr>
   </thead>
   <tbody>
     <?php

     $rows = isset($numRows) ? $numRows : 10;
     for($x = 0; $x < $rows; $x++) {
      echo "<tr>\n";
      for($y = 0; $y < $columns; $y++) {
       /* If operand isn't set yet, I set it to an addition default */
       if ( isset($operand) &&  ($operand == "multiplication")) {
        echo "<td>" . $x . " X " . $y . " = " . ($x * $y) . "</td>\n";
      } elseif ( isset($operand) && ($operand == "addition") ) {
        echo "<td>" . $x . " + " . $y . " = " . ($x + $y) . "</td>\n";
      } else {
        echo "<td>" . $x . " + " . $y . " = " . ($x + $y) . "</td>\n";
      }
    }
    echo "</tr>\n";
  }
  ?>
</tbody>

</table>
</body>
</html>

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Help creating multiplication and addition tables in PHP

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