php - PHP7 driver not found (mysql) -

here connection code (php7):

try {     $conn = new pdo('mysql :host='.$host.';dbname='.$database, $user, $password); } catch (exception $e) {     die('erreur  : ' . $e->getmessage()); } 

and receive following error 'could not find driver" :

my phpinfo():

                pdo pdo support     enabled  pdo drivers     mysql, sqlite              pdo_mysql pdo driver mysql        enabled client api version      mysqlnd 5.0.12-dev - 20150407 - $id: b5c5906d452ec590732a93b051f3827e02749b83 $  directive                       local value                     master value pdo_mysql.default_socket        /var/run/mysqld/mysqld.sock     /var/run/mysqld/mysqld.sock 

any idea?

try instead connection string:

$conn = new pdo("mysql:host=$host;dbname=$database", $user, $password); 

poorly placed spaces cause problems.