PDO : Uncaught PDO exception: could not find driver

[StephenKirwin]

I used this layer to create a PHP lambda API. I then tried to create a PDO and connect it to a MySQL database. I got the following error
"Uncaught PDOException: could not find driver in /var/task/index.php"

My php.ini file contains the following:
extension=json.so
extension=mysql.so
extension=pdo_mysql.so
extension=pdo.so
extension=php_pdo_mysql.dll
extension=pdo_mysql.dll

Here is my index.php code for creating the DB
$conn = null;

$conn = new PDO('mysql:host=' . $host . ';dbname=' . $db_name, $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

[czerniachowicz]

I'm seeing the same or similar, its not that it can't find the extension but it doesn't seem to be compiled properly:

undefined symbol: mysqlnd_allocator

[Sun Aug 30 20:24:07 2020] PHP Warning: PHP Startup: Unable to load dynamic library 'pdo_mysql.so' (tried: /opt/lib/php/7.3/modules/pdo_mysql.so (/opt/lib/php/7.3/modules/pdo_mysql.so: undefined symbol: mysqlnd_allocator), /opt/lib/php/7.3/modules/pdo_mysql.so.so (/opt/lib/php/7.3/modules/pdo_mysql.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 |  

Any thoughts?

[czerniachowicz]

The solution is quite simple actually, in your php.ini reorder your extensions so that the mysqlnd is loaded first, and any mysql related extensions are last.