Is there a PHP command I can use to determine if PDO is enabled or disabled?
I know I an manually run phpinfo() and eyeball it, but I have a script I run various web servers that display selected PHP configuration settings for the server.
So I am looking to see if there is a command I can use.
The proper way of determining that will be using the extension_loaded function:-
if ( extension_loaded('pdo') ) { ....... } And you might also want to check for the database-specific PDO driver using:-
if ( extension_loaded('pdo_<database type here>') ) { // e.g., pdo_mysql ....... } 
pdo_firebird, pdo_mysql, pdo_oci, pdo_odbc, pdo_pgsql, pdo_sqlite, pdo_sqlite_external Check if the class exists:
if (class_exists('PDO')) I appreciate the support and all the upvotes I still get, but please check Salman Abbas's answer for the proper way to do this.
defined() but PDO switched to class constants.
false as 2nd param? If the OP only purely wants to check for existance, but not to autoload the class at the same time, I mean.
PDO.Just run the command as php -m from the command prompt which will display list of modules installed for PHP
You have two options:
if (extension_loaded('pdo')) { /* ... */ } Or (this one is not 100% reliable since it can be implemented in user-land classes):
if (class_exists('PDO', false)) { /* ... */ } Personally, I prefer the first option.
if (!defined('PDO::ATTR_DRIVER_NAME')) { echo 'PDO unavailable'; } elseif (defined('PDO::ATTR_DRIVER_NAME')) { echo 'PDO available'; } I hope this works
How about
if (in_array('pdo', get_loaded_extensions())) { ... pdo is there ... } For checking it on linux terminal level using above command
php -m
which would give output related to modules installed from your php.ini
