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3个PHP多维数组转为一维数组的方法实例

Jun 06, 2016 pm 08:24 PM
php php array

这篇文章主要介绍了3个PHP多维数组转为一维数组的方法实例,分别使用foreach、for、while三种循环方法来实现,需要的朋友可以参考下

很多时候我们需要将多维数组转成一维数组,,因为我们只需要一维数组,而且一维数组使用起来更方便,在PHP中如何将多维数组转成一维数组?下面我们来看看三个多维数组转为一维数组例子:
一、使用foreach

复制代码 代码如下:

   function arr_foreach ($arr)
   {
      static $tmp=array(); 
      if (!is_array ($arr))
      {
         return false;
      }
      foreach ($arr as $val )
      {
         if (is_array ($val))
         {
            arr_foreach ($val);
         }
         else
         {
            $tmp[]=$val;
         }
      }
      return $tmp;
   }
   $a = array(1,2=>array(3,4=>array(5,6)),7);
   print_r(arr_foreach($a));
?>


二、使用for循环,只能遍历数字下标的数组

复制代码 代码如下:

   function arr_foreach($arr)
   {
      static $tmp=array(); 

      for($i=0; $i      { 
         if(is_array($arr[$i]))
         { 
            arr_foreach($arr[$i]); 
         }else{ 
            $tmp[]=$arr[$i]; 
         } 
      } 

      return $tmp; 
   }
   //调用例子
   $a = array(1,array(3,array(5,6)),7);
   print_r(arr_foreach($a));
?>


三、使用while

复制代码 代码如下:

/**
 * 将多维数组转为一维数组
 * @author echo
 * @link
 * @param array $arr
 * @return array
 */
function ArrMd2Ud($arr) {
 #将数值第一元素作为容器,作地址赋值。
 $ar_room = &$arr[key($arr)];
 #第一容器不是数组进去转呀
 if (!is_array($ar_room)) {
  #转为成数组
  $ar_room = array($ar_room);
 }
 #指针下移
 next($arr);
 #遍历
 while (list($k, $v) = each($arr)) {
  #是数组就递归深挖,不是就转成数组
  $v = is_array($v) ? call_user_func(__FUNCTION__, $v) : array($v);
  #递归合并
  $ar_room = array_merge_recursive($ar_room, $v);
  #释放当前下标的数组元素
  unset($arr[$k]);
 }
 return $ar_room;
}

调用示例:

复制代码 代码如下:


$arr = array(1, 2, 3 => array(1, 2, 'ar' => array(1, 2 => array('a', 'b'))), array('ar' => array(3, 4)));
print_r(ArrMd2Ud($arr));


输出:

复制代码 代码如下:


Array
(
    [0] => 1
    [1] => 2
    [2] => 1
    [3] => 2
    [4] => 1
    [5] => a
    [6] => b
    [7] => 3
    [8] => 4
)

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