在php中遍歷循環讀出數組的方法有幾種,foreach,for,list,each,while都是可以的,只是那種更適合用來遍歷數組了。
foreach來訪問,遍歷的順序是固定的么? 以什么順序遍歷呢?
比如:代碼如下:
- <?php
- $colors= array('red','blue','green','yellow');
- foreach ($colors as $color){
- //add your codes
- }
- ?>
例2,代碼如下:
- $capitals= array("Ohio"=> "Columbus","Towa"=> "Des Moines","Arizona"=> "Phoenix");
- foreach($capitals as $key=> $val){
- //add your codes
- }
while()
while() 通常和 list(),each()配合使用,實例代碼如下:
- <?php
- $colors = array('red','blue','green','yellow');
- while(list($key,$val) = each($colors)) {
- echo "Other list of $val.<br />";
- }
- ?>
- /*
- 顯示結果:
- Other list of red.
- Other list of blue.
- Other list of green.
- Other list of yellow.
- */
3. for(),實例代碼如下:
- <?php
- $arr = array ("0" => "zero","1" => "one","2" => "two");
- for ($i = 0;$i < count($arr); $i++) {
- $str = $arr[$i];
- echo "the number is $str.<br />";
- }
- ?>
- /*
- 顯示結果:
- the number is zero.
- the number is one.
- the number is two.
- */
以下是函數介紹:
key()
mixed key(array input_array)
key()函數返回input_array中位于當前指針位置的鍵元素。
實例代碼如下:
- <?php
- $capitals = array("Ohio" => "Columbus","Towa" => "Des Moines","Arizona" => "Phoenix");
- echo "<p>Can you name the capitals of these states?</p>";
- while($key = key($capitals)) {
- echo $key."<br />";
- next($capitals);
- //每個key()調用不會推進指針。為此要使用next()函數
- }
- ?>
- /*結果如下
- Can you name the capitals of these states?
- Ohio
- Towa
- Arizona
- */
each() 函數遍歷數組
例子1,代碼如下:
- <?php
- $people = array("Peter", "Joe", "Glenn", "Cleveland");
- print_r (each($people));
- ?>
- //輸出:
- //Array ( [1] => Peter [value] => Peter [0] => 0 [key] => 0 )
例子2,代碼如下:
each() 經常和 list() 結合使用來遍歷數組,本例與上例類似,不過循環輸出了整個數組,代碼如下:
- <?php
- $people = array("Peter", "Joe", "Glenn", "Cleveland");
- reset($people);
- while (list($key, $val) = each($people))
- {
- echo "$key => $val<br />";
- }
- ?>
- /*
- 輸出:
- 0 => Peter
- 1 => Joe
- 2 => Glenn
- 3 => Cleveland
- */
多維數組的遞歸遍歷,代碼如下:
- <?php
- /*
- * -------------------------------------------------
- * Author :
- * Url : www.49028c.com* Date : 2011-03-09
- * -------------------------------------------------
- */
- function arr_foreach ($arr)
- {
- if (!is_array ($arr))
- {
- return false;
- }
- foreach ($arr as $key => $val )
- {
- if (is_array ($val))
- {
- arr_foreach ($val);
- }
- else
- {
- echo $val.'<br/>';
- }
- }
- }
- $arr1 = array (1=>array(11,12,13,14=>array(141,142)),2,3,4,5);
- echo '<pre>';
- print_r($arr1);
- echo '<pre>';
- arr_foreach ($arr1);
- ?>
- /*
- 結果
- 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
- */
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