Description:
------------
We have to close connection MySQL before  to use pcntl_wait and repoen it after to make it work.

Or when the son dead and get back with father.

Test script:
---------------
 <?php

 $db = new MySQLi('localhost','root','zeb33tln');

 if (pcntl_fork()) {
     echo "pid du pere ".getmypid().PHP_EOL;
     $status = 0;



    $result = $db->query('select version()');
    if ($db->error) echo "error 1".$db->error.PHP_EOL;

    //pcntl_wait($status);

    $result = $db->query('select version()');
        if ($db->error) echo "error 2".$db->error.PHP_EOL;


 } else {
     echo "pid son ".getmypid().PHP_EOL;


    $result = $db->query('select version()');
 if ($db->error) echo "error 3".$db->error.PHP_EOL;

     exit;
 }


    $result = $db->query('select version()');
 if ($db->error) echo "error 4".$db->error.PHP_EOL;

 echo "END".PHP_EOL;

Expected result:
----------------
pid du pere 26717
pid son 26718
END


Actual result:
--------------
pid du pere 26749
pid son 26750
PHP Warning:  Packets out of order. Expected 1 received 5. Packet size=31 in /home/www/glial/testmysql.php on line 11
PHP Warning:  mysqli::query(): MySQL server has gone away in /home/www/glial/testmysql.php on line 11
PHP Warning:  mysqli::query(): Error reading result set's header in /home/www/glial/testmysql.php on line 11
error 1MySQL server has gone away
error 2MySQL server has gone away
error 4MySQL server has gone away
END
PHP Warning:  Packets out of order. Expected 3 received 0. Packet size=65029 in /home/www/glial/testmysql.php on line 24
PHP Warning:  mysqli::query(): MySQL server has gone away in /home/www/glial/testmysql.php on line 24
error 3MySQL server has gone away