Online PHP editor | output for 6sDXT

<?php interface Table { public function getTableName(); } class TableA implements Table { public function getTableName() { return 'TableA'; } } class TableB implements Table { public function getTableName() { return 'TableB'; } } class TableC implements Table { public function getTableName() { return 'TableC'; } } class TableD implements Table { public function getTableName() { return 'TableD'; } } class Service { public $tableA; public $tableB; public $tableC; public $tableD; public function __construct(Table a, Table b, Table c, Table d) { $this->tableA = a; $this->tableB = b; $this->tableC = c; $this->tableD = d; } public function table_A_and_B_doSomething() { echo $this->tableA->getTableName(), ' ', $this->tableB->getTableName(); } public function table_C_and_D_doSomething() { echo $this->tableC->getTableName(), ' ', $this->tableD->getTableName(); } } $service = new Service(new tableA(), new tableB(), new tableC(), new tableD()); $service->table_C_and_D_doSomething();