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<?php class MyInterval extends DateInterval { public static function instance(DateInterval $di) { return new static($di->spec()); } } $diff = (new DateTime('yesterday'))->diff(new DateTime('tomorrow')); $myDiff = MyInterval::instance($diff); var_dump($myDiff);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined method DateInterval::spec() in /in/M0oXl:7 Stack trace: #0 /in/M0oXl(13): MyInterval::instance(Object(DateInterval)) #1 {main} thrown in /in/M0oXl on line 7
Process exited with code 255.

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