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<?php $array = [ ['projects_users' => ['project_id' => 1]], ['projects_users' => ['project_id' => 2]], ]; $result = []; foreach ($array as ['projects_users' => ['project_id' => $result[]]]); var_export($result);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => 1, 1 => 2, )

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