pdo is working fine with mysql but with pgsql its giving error \'PDOException\' with message \'could not find driver\' I\'ve installed php5-pgsql p
When you do not have postgresql installed on the same machine that is Apache and PHP; you have to install php-pgsql and don't have to add extensions in php.ini manually in Linux (in Windows yes), because redundancies are generated and this does not work (checked in error.log).
$ sudo apt install php-pgsql
Then you can check the existence of the extension enabled automatically in:
$ sudo nano /etc/php/7.0/apache2/conf.d/10-pdo.ini
Observations: In phpinfo() you will find the directory conf.d/ and the file error.log
GL