When I installed Phalcon 2.0.13 according to the https://docs.phalconphp.com/en/latest/reference/install.html description and I wanted to launch my test script then I got the following error (literally it is just a warning but it causes Phalcon not to be loaded which causes errors):
{ PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/phalcon.so' - /usr/lib/php/20131226/phalcon.so: undefined symbol: php_pdo_get_dbh_ce in Unknown on line 0 }
What is this symptom cased by and how could I get rid of it?