order_by_date.php

 <?php 
 //模拟一个订单数组
 $arr = array(
      0 => array(
            "o_id"=>"1",
            "name"=>"田景文",
            "tel"=>"18677216692",
            "order_date"=>"1412146800" //10-1
      ),
      1 => array(
            "o_id"=>"2",
            "name"=>"田景文2",
            "tel"=>"18677216692",
            "order_date"=>"1412146800" //10-1
      ),
      2 => array(
            "o_id"=>"3",
            "name"=>"田景文3",
            "tel"=>"18677216692",
            "order_date"=>"1412319600" //10-3
      ),
       3 => array(
            "o_id"=>"4",
            "name"=>"田景文4",
            "tel"=>"18677216692",
            "order_date"=>"1412492400" //10-5
      ),
       4 => array(
            "o_id"=>"5",
            "name"=>"田景文5",
            "tel"=>"18677216692",
            "order_date"=>"1412492400" //10-5
      ),
      5 => array(
            "o_id"=>"6",
            "name"=>"田景文6",
            "tel"=>"18677216692",
            "order_date"=>"1412751600" //10-8
      ),
      6 => array(
            "o_id"=>"7",
            "name"=>"田景文7",
            "tel"=>"18677216692",
            "order_date"=>"1412924400" //10-10
      )
);

//获取时间数组的函数
function getDateArr ( $start, $end )
{
  $date = array();
  $s = abs((strtotime(date('Y-m-d',$start))-strtotime("xxxx-xx-xx"))/86400);
	$e = abs((strtotime(date('Y-m-d',$end))-strtotime("xxxx-xx-xx"))/86400);
  $num = $e - $s;//活动总天数
  for($i = 0;$i<=$num;$i++){
  	$date[] = date('Y-m-d',$start+86400*$i);
  }
  return $date;
}

$start = 1412146800;//开始时间2014-10-1
$end = 1412838000;//结束时间2014-10-9
$date = getDateArr ( $start, $end );//输出10/1-10/9的日期数组

$newArr = array();//定义一个新数组，用于存储结果数据
$existDate = array();//定义一个存储存在数据的日期的数组
$emptyDate = array();//定义一个存储空数据的日期的数组
//定义一套空值模板(没有在日期范围内的)
$emptyTemplate = array(
    "o_id"=>"0",
    "name"=>"0",
    "tel"=>"0",
    "order_date"=>"0"
);

//循环日期
foreach($date as $key=>$value){ 
  //按照期日去循环数据
  foreach($arr as $k => $v){
      if(date('Y-m-d',$arr[$k]['order_date']) == $date[$key]){
          $newArr[$date[$key]][] = $arr[$k];
          $existDate[] = $date[$key];//如果有数据则记录下这个日期
      }
  }
}
$emptyDate = array_diff($date,array_unique($existDate));//差集得到没有数据的日期

//给没有日期的数组加上默认的模板
foreach($emptyDate as $key => $value){
    $newArr[$emptyDate[$key]] =  $emptyTemplate;
}

//重新对数据按照日期进行整理

echo '<pre>';
print_r($newArr);
print_r(array_unique($existDate));
print_r($emptyDate);