乘法口诀表

        <?php
            echo "<table border=1>";
                for ($i=1; $i <= 9 ; $i++) {
                    echo "<tr>";
                        for ($j=1; $j <= $i; $j++) {
                            echo "<td>$j*$i = ".$j*$i."</td>";
                        }
                    echo "</tr>";
                }
            echo "</table>";
        ?>

<table>
        <?php
            for ($i=1; $i <= 9; $i++) {
                echo "<tr>";
                for ($j=1; $j <= 9; $j++) {
                    if ($j > $i) {
                        echo "<td></td>";
                    } else {
                        echo "<td>$j * $i = " . ($i * $j) . "</td>";
                    }
                }
                echo "</tr>";
            }
         ?>
         </table>