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<?php class C{ protected $date; public function __construct(){ $this->date=new DateTime(); } public function getCurrent(){ return clone $date; } } class A extends C{ public function getDate(){ return $this->getCurrent()->add(new DateInterval('P10D')); } public function getDateAgain(){ return $this->getCurrent()->add(new DateInterval('P10D')); } } class B extends C{ public function getDate(){ return $this->getCurrent()->add(new DateInterval('P20D')); } } $a=new A(); $b=new B(); echo $a->getDate()->format('Y-m-d') . "\n"; echo $b->getDate()->format('Y-m-d') . "\n"; echo $a->getDateAgain()->format('Y-m-d') . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $date in /in/MYNp6 on line 11 Fatal error: Uncaught Error: __clone method called on non-object in /in/MYNp6:11 Stack trace: #0 /in/MYNp6(16): C->getCurrent() #1 /in/MYNp6(30): A->getDate() #2 {main} thrown in /in/MYNp6 on line 11
Process exited with code 255.

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