PHP traversal method of multi-dimensional array_PHP tutorial-PHP Tutorial-php.cn

PHP traversal method of multi-dimensional array_PHP tutorial

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Release： 2016-07-13 10:44:41

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There are many types of arrays in PHP, such as one-dimensional arrays, two-dimensional arrays, three-dimensional or multi-dimensional arrays. Now I will introduce to you how to traverse multi-dimensional arrays in PHP. Friends in need can refer to it.

There are three functions foreach, each, list & each in PHP to traverse arrays. Let’s see how they traverse multi-dimensional arrays.

Let’s first look at traversing a two-dimensional array

The code is as follows

Copy code

代码如下	复制代码
$sports = array( 'football' => 'good', 'swimming' => 'very well', 'running' => 'not good' ); foreach ($sports as $key => $value) { echo $key.": ".$value." "; } ?>

$sports = array(
'football' => 'good',
'swimming' => 'very well',
'running' => 'not good'
);

foreach ($sports as $key => $value) {
echo $key.": ".$value."
";
}
?>

Look below at traversing a three-dimensional array

Example 1

代码如下	复制代码
function arr_fun($arr){ if(is_array($arr)){ foreach($arr as $v){ if(is_array($v)){ arr_fun($v); }else{ echo $v." "; } } }else{ echo $arr." "; } }

The code is as follows	Copy code
function arr_fun($arr){ If(is_array($arr)){ foreach($arr as $v){ if(is_array($v)){ arr_fun($v); }else{ echo $v." "; } } }else{ echo $arr." "; } }

例2

输出结果

代码如下

复制代码

/*
* -------------------------------------------------
* Url : www.bKjia.c0m
* Date : 2011-03-09
* -------------------------------------------------
*/
function arr_foreach ($arr)
{
if (!is_array ($arr))
{
return false;
}

foreach ($arr as $key => $val )
{
  if (is_array ($val))
  {
   arr_foreach ($val);
  }
  else
  {
   echo $val.'
';
  }
}
}
$arr1 = array (1=>array(11,12,13,14=>array(141,142)),2,3,4,5);
echo '

';

print_r($arr1);

echo '';

arr_foreach ($arr1);

?>
输出结果
Array

(

    [1] => Array

        (

            [0] => 11

            [1] => 12

            [2] => 13

            [14] => Array

                (

                    [0] => 141

                    [1] => 142

                )

        )

    [2] => 2

    [3] => 3

    [4] => 4

    [5] => 5

)

11

12

13

141

142

2

3

4

5

复制代码

代码如下

复制代码

$sports = array(
'football' => 'good',
'swimming' => 'www.bKjia.c0m',
'running' => 'not good'
);

while (list($key, $value) = each($sports)) {
echo $key.": ".$value."
";
}
?>

/*
* -------------------------------------------------
*   Url    : www.bKjia.c0m
*   Date   : 2011-03-09
* -------------------------------------------------
*/
function arr_foreach ($arr)
{
if (!is_array ($arr))
{
  return false;
}

foreach ($arr as $key => $val )
{
  if (is_array ($val))
  {
   arr_foreach ($val);
  }
  else
  {
   echo $val.'
';
  }
}
}
$arr1 = array (1=>array(11,12,13,14=>array(141,142)),2,3,4,5);
echo '

';

print_r($arr1);

echo '';

arr_foreach ($arr1);

?>

Array
(
    [1] => Array
        (
            [0] => 11
            [1] => 12
            [2] => 13
            [14] => Array
                (
                    [0] => 141
                    [1] => 142
                )
        )
    [2] => 2
    [3] => 3
    [4] => 4
    [5] => 5
)
11
12
13
141
142
2
3
4
5