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<?php $k = (string)"0"; $a = array( 'name' => 'a', $k => 'null' ); $b = array( 'name' => 'b', $k => 'zero' ); $b = array( $k => 'zeronull', 'name' => 'b' ); var_dump($a); var_dump($b); var_dump($c); var_dump(array_merge($a, $b)); var_dump(array_merge($a, $c)); var_dump(array_merge($a, $b, $c));

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