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<?php class Foo { public $id; public function __construct(){ static $counter = 0; $this->id = $counter; ++$counter; } } $collection = [new Foo(), new Foo(), new Foo(), new Foo()]; print_r(array_column($collection, 'id'));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 )

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