php - mysqli driver not found in xamp when using pdo -

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hi trying use pdo connect mysqli database on xamp , keep getting error.

php connection code 

$handler = new pdo('mysqli:host=127.0.0.1;dbname=app','root','');

error message

fatal error: uncaught exception 'pdoexception' message 'could not find driver' in

remove mysqli:

$handler = new pdo('mysql:host=127.0.0.1;dbname=app','root','');

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