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<?php abstract class A{ static protected $shared = array(); static function create(){ if (isset(static::$shared['mailer'])){ return static::$shared['mailer']; } $mailer = new static(); //this is the correct way return static::$shared['mailer'] = $mailer; } } class B extends A{ } $obj=B::create(); $obj1=B::create(); var_dump($obj); var_dump($obj1);
Output for git.master, git.master_jit, rfc.property-hooks
object(B)#1 (0) { } object(B)#1 (0) { }

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