Q:

PHP Runs on Terminal but Web Page is Blank

I am using PHP to connect to a locally hosted MySQL database, and displaying the results on a web page. My code goes like this:
  <div class="starter-template">
    <h1>Phone Number Leak!</h1>
    <p class="lead">P<?php echo "phone numbers leaked from Twitter"; ?></p>

<div style = "height:100vh;">
<?php

    error_reporting(-1);
    error_reporting(E_ALL);
    echo "Hello";

    $con = mysqli_connect('localhost', 'root', 'password', 'twitter_phone');
    if (mysqli_connect_errno())
    {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }
    echo "Connection established";
    $r2 = mysqli_query($con, "Select * from phone2");

    //echo "<table border = '1'>";
    while($row = mysqli_fetch_array($r2))
    {
        echo $row['author'];
        echo "<tr> <td>Checking ... </td>";
        echo "<td>" . $row['tweet'] . "</td><td>" . $row['author'] . "</td><td>" . $row['number'] . "</td>";
        echo "</tr>";
    }

    mysqli_close($con);
    echo "</table>";    
?>
</div>
<!--</table>-->
  </div>

</div><!-- /.container -->

<script src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
<script src="bootstrap.min.js"></script>
</body>
</html>

When I run this in the terminal as php index1.php, I see that it has fetched all the data from the tables, and it generates appropriate HTML code. But when I view it on the web page, I can't see anything. In fact, when I look at the source code, it ends after <div style = "height:100vh;">
    Hello
The HTML tags that follow the PHP section don't show up either. Error reporting also does nothing - all I get is a blank page with only the bits before the PHP code starts, and this last Hello message. 
A simple echo command works, so it isn't a problem with the PHP setup either, right? So what's wrong?
Thanks in advance!

A:

After adding this line var_dump(function_exists('mysqli_connect'));, I found out that mysqli was not enabled.
I did have the required packages though, so turns out I only had to do sudo service apache2 restart. :)

