在php中遍历循环读出数组的方法有几种，foreach,for,list,each,while都是可以的，只是那种更适合用来遍历数组了。

foreach来访问,遍历的顺序是固定的么? 以什么顺序遍历呢?

比如:代码如下:

1. <?php
2. $colors= array('red','blue','green','yellow');
3. foreach ($colors as $color){
4. //add your codes
5. }
6. ?>

例2,代码如下:

1. $capitals= array("Ohio"=> "Columbus","Towa"=> "Des Moines","Arizona"=> "Phoenix");
2. foreach($capitals as $key=> $val){
3. //add your codes
4. }

while()

while() 通常和 list(),each()配合使用,实例代码如下:

1. <?php
2. $colors = array('red','blue','green','yellow');
3. while(list($key,$val) = each($colors)) {
4. echo "Other list of $val.<br />";
5. }
6. ?>
7. /*
8. 显示结果：
9. Other list of red.
10. Other list of blue.
11. Other list of green.
12. Other list of yellow.
13. */

3. for(),实例代码如下:

1. <?php
2. $arr = array ("0" => "zero","1" => "one","2" => "two");
3. for ($i = 0;$i < count($arr); $i++) {
4. $str = $arr[$i];
5. echo "the number is $str.<br />";
6. }
7. ?>
8. /*
9. 显示结果：
10. the number is zero.
11. the number is one.
12. the number is two.
13. */

以下是函数介绍:

key()

mixed key(array input_array)

key()函数返回input_array中位于当前指针位置的键元素。

实例代码如下:

1. <?php
2. $capitals = array("Ohio" => "Columbus","Towa" => "Des Moines","Arizona" => "Phoenix");
3. echo "<p>Can you name the capitals of these states?</p>";
4. while($key = key($capitals)) {
5. echo $key."<br />";
6. next($capitals);
7. //每个key()调用不会推进指针。为此要使用next()函数
8. }
9. ?>
10. /*结果如下
11. Can you name the capitals of these states?
12. Ohio
13. Towa
14. Arizona
15. */

each() 函数遍历数组

例子1,代码如下:

1. <?php
2. $people = array("Peter", "Joe", "Glenn", "Cleveland");
3. print_r (each($people));
4. ?>
5. //输出：
6. //Array ( [1] => Peter [value] => Peter [0] => 0 [key] => 0 )

例子2,代码如下:

each() 经常和 list() 结合使用来遍历数组,本例与上例类似,不过循环输出了整个数组,代码如下:

1. <?php
2. $people = array("Peter", "Joe", "Glenn", "Cleveland");
3. reset($people);
4. while (list($key, $val) = each($people))
5. {
6. echo "$key => $val<br />";
7. }
8. ?>
9. /*
10. 输出：
11. 0 => Peter
12. 1 => Joe
13. 2 => Glenn
14. 3 => Cleveland
15. */

多维数组的递归遍历,代码如下:

1. <?php
2. /*
3. * -------------------------------------------------
4. * Author :
5. * Url : www.phpfensi.com* Date : 2011-03-09
6. * -------------------------------------------------
7. */
8. function arr_foreach ($arr)
9. {
10. if (!is_array ($arr))
11. {
12. return false;
13. }
14. foreach ($arr as $key => $val )
15. {
16. if (is_array ($val))
17. {
18. arr_foreach ($val);
19. }
20. else
21. {
22. echo $val.'<br/>';
23. }
24. }
25. }
26. $arr1 = array (1=>array(11,12,13,14=>array(141,142)),2,3,4,5);
27. echo '<pre>';
28. print_r($arr1);
29. echo '<pre>';
30. arr_foreach ($arr1);
31. ?>
32. /*
33. 结果
34. Array
35. (
36. [1] => Array
37. (
38. [0] => 11
39. [1] => 12
40. [2] => 13
41. [14] => Array
42. (
43. [0] => 141
44. [1] => 142
45. )
46. )
47. [2] => 2
48. [3] => 3
49. [4] => 4
50. [5] => 5
51. )
52. 11
53. 12
54. 13
55. 141
56. 142
57. 2
58. 3
59. 4
60. 5
61. */