title: Unable to load dynamic library 'pdo_mysql'
body: <p>i tried to use php pdo to connect to mysql so i uncomment</p>
  
  <pre><code> extension=pdo_mysql 
  </code></pre>
  
  <p>in the php.ini and any php action shows me this warning</p>
  
  <pre><code>PHP Warning:  PHP Startup: Unable to load dynamic library 'pdo_mysql' (tried: /usr/lib/php/20170718/pdo_mysql (/usr/lib/php/20170718/pdo_mysql: cannot open shared object file: No such file or directory), /usr/lib/php/20170718/pdo_mysql.so (/usr/lib/php/20170718/pdo_mysql.so: undefined symbol: mysqlnd_allocator)) in Unknown on line 0
  </code></pre>
  
  <p>i check where is the file that cannot open(/usr/lib/php/20170718/pdo_mysql) and it did exist and is full o characters.I haven't try to make use of pdo in the code but i'm guessing that is not going to work and i haven't found any helpful solution. thanks before anything</p>
  
  <p>PD. i'm using ubuntu 18.06</p>