@startuml

set namespaceSeparator \\

class PDO {
    + __construct(\n\tdsn : string,\n\tusername :string := null,\n\tpassword : string := null,\n\toptions : array := null\n\t)
    + lastInsertId(\n\tname  : string := null\n\t): string|false
    + prepare(\n\tquery : string,\n\toptions : array := []\n\t): PDOStatement|false
}

' class PDOStatement implements IteratorAggregate {
class PDOStatement {
    + bindValue(...): bool
    + execute(params : array := null): bool
    + fetch(...): mixed
    + fetchAll(...): array
    + rowCount(): int
    + setFetchMode(...): bool
}

namespace Database {
    class MyPdo {
'        - {static} myPdoInstance : MyPdo
        - {static} dsn : string
        - {static} username : string := ''
        - {static} password : string := ''
        - {static} options : array := []

        - __construct(\n\tdsn : string,\n\tusername : string := null,\n\tpassword : string := null,\n\toptions : array := null)
        - private __clone() : void
        + {static} getInstance() : MyPdo
        + {static} setConfiguration(\n\tdsn : string,\n\tusername : string := '',\n\tpassword : string := '',\n\toptions : array := []) : void
        - {static} hasConfiguration() : bool
        - {static} setConfigurationFromEnvironmentVariables() : bool
        - {static} setConfigurationFromIniFile() : bool
    }
}

Database\\MyPdo -up-|> PDO
PDO .right.> PDOStatement : "<<use>>"
Database\\MyPdo "1" *--> "0..1 \n-<u>myPdoInstance</u>" Database\\MyPdo : contains

@enduml