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<?php $array = range('a', 'g'); $n = 2; var_export( array_map(fn($chunk) => array_pad($chunk, $n, null), array_chunk($array, $n)) );
Output for git.master_jit, git.master
array ( 0 => array ( 0 => 'a', 1 => 'b', ), 1 => array ( 0 => 'c', 1 => 'd', ), 2 => array ( 0 => 'e', 1 => 'f', ), 3 => array ( 0 => 'g', 1 => NULL, ), )

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