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<?php class ThisClass { const FIRST = 'hey'; public function getFIRST() { return self::FIRST; } } class ThatClass { private $model; public function setModel(ThisClass $model) { $this->model = $model; } public function getModel() { return $this->model; } } $Class = new ThisClass(); echo $Class->getFIRST(); //returns: hey echo $Class::FIRST; //returns: hey; PHP >= 5.3 // Edit: Based on OP's comments $Class2 = new ThatClass(); $Class2->setModel($Class); echo $Class2->getModel()->getFIRST(); //returns: hey
Output for git.master, git.master_jit, rfc.property-hooks
heyheyhey

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