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<?php $array = [ 'a' => ['page' => 'page1', 'name' => 'pagename1'], 'b' => ['page' => 'page2', 'name' => 'pagename2'], 'c' => ['page' => 'page3', 'name' => 'pagename3'], 'd' => ['page' => 'page4',], ]; var_export(array_reduce($array, fn($result, $row) => array_merge($result, [$row['name'] ?? 'missing']), []));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'pagename1', 1 => 'pagename2', 2 => 'pagename3', 3 => 'missing', )

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