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
{
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
{
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
* 将多维数组转为一维数组
* @author echo
* @link http://www.php.net/
* @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:
$arr = array(1, 2, 3 => array(1, 2, 'ar' => array(1, 2 => array('a', 'b'))), array('ar' => array(3, 4)));
print_r(ArrMd2Ud($arr));
输出:
Array
(
[0] => 1
[1] => 2
[2] => 1
[3] => 2
[4] => 1
[5] => a
[6] => b
[7] => 3
[8] => 4
)

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