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<?php $a = array(); $a[] = array('a' => 1); $a[] = array('a' => 2); $a[] = array('a' => 3); $column = 'a'; $res = array_map(function ($item) use ($column) {return is_object($item) ? $item->{$column} : $item[$column]; }, $a); var_dump($res);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }

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