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<?php $data = array( '2011-07-29' => 39, '2011-07-30' => 39, '2011-07-31' => 39, '2011-08-01' => 40, ); $keys = array_keys($data); foreach($keys as &$key) { list(,$month) = sscanf($key, '%d-%d-%d'); $month = sprintf("%02d", $month-1); $key[5] = $month[0]; $key[6] = $month[1]; } unset($key); $data = array_combine($keys, $data); print_r($data);
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