为什么这个for循环只进行一次迭代？

For some reason this loop only does one iteration and makes only 1 row. Can anyone spot an error?

        for($i = 0; $i < 7; $i++){
            echo "<tr>";
            echo "<td>" . ($min + ($i * 5)) . "</td>";
            for($i = 1; $i < 6; $i++){
                echo "<td>" . $min . "</td>";
            }
            echo "</tr>";
        }

You are using same variable in both loops ($i). Use another variable in second loop.