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<?php $promos = [ '123' => ['weight' => 0], '234' => ['weight' => 1], '345' => ['weight' => 2], ]; var_dump(array_column($promos, 'weight'));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) }

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