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<?php class Foo { public function __construct() { echo 'created!'; } } class Bar { protected $foo; public function getFoo() { return $this->foo ?? ($this->foo = new Foo); } } var_dump((new Bar)->getFoo());
Output for 7.0.0 - 7.2.0
created!object(Foo)#2 (0) { }
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/l0Ccd on line 17
Process exited with code 255.