<?php

    $server = 'localhost';
    $user = 'name';
    $pass = 'password';
    $dbname = 'dbname';

    $conn = new mysqli($server, $user, $pass, $dbname);

    $sql = "Update table;";
    $conn->query($sql);

    $conn->close();
    ?>

/home/username/public_html/cron.php: line 1: ?php: No such file or directory
/home/username/public_html/cron.php: line 3: =: command not found
/home/username/public_html/cron.php: line 4: =: command not found
/home/username/public_html/cron.php: line 5: =: command not found
/home/username/public_html/cron.php: line 6: =: command not found
/home/username/public_html/cron.php: line 8: syntax error near unexpected token `('
/home/username/public_html/cron.php: line 8: `$conn = new mysqli($server, $user, $pass, $dbname);'

php /home/username/public_html/cron.php