PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/ undefined symbol: php_pdo_get_dbh_ce in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php5/ undefined symbol: php_pdo_get_dbh_ce in Unknown on line 0

cd /etc/php5
find . -type f -exec grep -l "pdo_mysql.so" {} \;
nano /etc/php5/mods-available/pdo_mysql.ini
cd /etc/php5/mods-available/
locate php.ini
#remove extention=php_phalcon.ini in all file

/etc/php5/apache2/php.ini
/etc/php5/cli/php.ini
/etc/php5/cli/php.ini
service apache2 restart
php
php -i | grep phalcon

Because phalcon need pdo_mysql.ini to booting. You only need load pdo_mysql.ini before load phalcon.ini, it's fine.

How to get trouble?