Laravel and oracle connection

I am trying to configure laravel to work with oracle database, I am trying to use Yajra for my connection but I get this error every time I try to run my application.

FatalThrowableError in Oci8.php line 449: Fatal error: Call to undefined function Yajra\Pdo\oci_connect()

If anyone can help me fix this i will be extremely grateful...

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