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//当月初始时间
$beginThisMonth = date("Y-m-d H:i:s", mktime(0, 0, 0, date('m'), 1, date('Y')));
//当月结束时间
$endThisMonth = date("Y-m-d H:i:s", mktime(23, 59, 59, date('m'), date('t'), date('Y')));