i updated Ubuntu 14 to Ubuntu 16.04 on my testserver to get compatible with my ISP's server.

My configuration as shown in phpMyAdmin, which runs fine!:

  • Server: Localhost via UNIX socket
  • Server type: MySQL
  • Server version: 5.7.17-0ubuntu0.16.04.1 - (Ubuntu)
  • Protocol version: 10
  • User: root@localhost
  • Server charset: UTF-8 Unicode (utf8)
  • Apache/2.4.18 (Ubuntu)
  • Database client version: libmysql - mysqlnd 5.0.12-dev - 20150407
  • PHP extension: mysqli Documentation
  • PHP version: 7.0.13-0ubuntu0.16.04.1

My test-script below create an empty screen in web-browser:

$link = mysqli_connect("localhost", "root", "cydb4tsa", "RedGround");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
}else{ echo "connected"; }

i found no relevant error-message in /var/log/mysql/error.log

mysql runs on the command line including all queries from imported tables:

sebu@sebu-Inspiron-3437:~$ mysql -u root -p<pw> RedGround

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.


apache2 runs, browser show default page and

ls /etc/apache2/mods-enabled/ | grep php

php7 runs, browser show all infos

phpMyAdmin runs normally although an error is displayed: Connection for controluser as defined in your configuration failed.

still get empty screen, when i run above php-script. Maybe a communication-error between mysql and php?

sebu@sebu-Inspiron-3437:~$ php -m

[PHP Modules]
calendar Core ctype date dom exif fileinfo filter ftp gd gettext hash
iconv json libxml mbstring mcrypt mysqli mysqlnd openssl pcntl pcre PDO
pdo_mysql Phar posix readline Reflection session shmop SimpleXML sockets SPL 
standard sysvmsg sysvsem sysvshm tokenizer wddx xml xmlreader xmlwriter xsl
Zend OPcache zlib

[Zend Modules]
Zend OPcache

screen of my project after update on my lap, localhost: enter image description here screen of my project online onISP-server: enter image description here

  • 1
    Maybe some PHP module is missing or is not enabled. What is the output of php -m? – pa4080 Jan 24 '17 at 10:49
  • 2
    Add these lines just after your <?php tag to display errors then try again: ini_set('display_errors', 1); ini_set('display_startup_errors', 1); error_reporting(E_ALL); – Parto Jan 24 '17 at 11:06
  • 1
    @Paul I'm looking the screenshot of your project, after update, and I think that I found the problem. By default PHP 7 doesn't support short open tags <? you need to rewrite your code and change them with <?php. Or you can try to enable short tags option in php.ini. Also I've made an experiment. I've run your "test-scrip" on my server and it works. After that I have changed <?php with <? and I've got blank window. – pa4080 Jan 24 '17 at 13:46
  • 1
    I tried to set short_open_tag=on in /etc/php/7.0/apache2/php.ini but for some reason it doesn't works. After that I put php_flag short_open_tag on in /etc/apache2/sites-available/my-site.conf - now the page works. – pa4080 Jan 24 '17 at 16:40
  • 1
    thank you for this hint, i will carefully check and give feedback this morning. – Paul Jan 24 '17 at 23:57

SOLVED Browser can disply output with following style:

<?  // should be <?php, but it works anyway because 
    $server     = $_SESSION['database_host'];
    $datenbank  = $_SESSION['database_name'];
    $username   = $_SESSION['database_user'];
    $passwort   = $_SESSION['database_user_pw'];
    $mySQL  =  new mysqli($server,$username,$passwort,$datenbank);
    if ($mySQL->connect_errno) 
        echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
    $sql = "SELECT count(fldID) count from tblPerson";
    // echo"$sql<br>";
    if (!$result = $mySQL->query($sql)) 
        echo "query \"$sql\" failed because $mySQL->error";

    if (! $result->num_rows) exit;

    $actor = $result->fetch_assoc();
    $nbr =  $actor['count'];
    echo "nuber is: ".$nbr." persons";


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