php遍历关联数组方法大全(foreach,list,each,list)

其中数字索引数组和C语言中的数组一样，下标是为0，1，2…
而关联数组下标可能是任意类型，与其它语言中的hash，map等结构相似。

下面介绍PHP中遍历关联数组的几种方法：
方法1：foreach

foreach()是一个用来遍历数组中数据的最简单有效的方法。

<?php 
$sports = array( 
'football' => 'good', 
'swimming' => 'very well', 
'running' => 'not good'); 
foreach ($sports as $key => $value) { 
echo $key.": ".$value."<br />"; 
?>

输出结果：

football: good 
swimming: very well 
running: not good

方法2：each

<?php 
$sports = array( 
'football' => 'good', 
'swimming' => 'very well', 
'running' => 'not good'); 
while ($elem = each($sports)) { 
echo $elem['key'].": ".$elem['value']."<br />"; 
?>

方法3：list & each

<?php 
$sports = array( 
'football' => 'good', 
'swimming' => 'very well', 
'running' => 'not good'); 
while (list($key, $value) = each($sports)) { 
echo $key.": ".$value."<br />"; 
?>

方法4：while() 和 list()，each()配合使用。

<?php
    $urls= array('aaa','bbb','ccc','ddd');
    while(list($key,$val)= each($urls)) {
      echo "This Site url is $val.<br />";
    }
?>

显示结果：

This Site url is aaa
This Site url is bbb
This Site url is ccc
This Site url is ddd

方法5：for()

<?php
    $urls= array('aaa','bbb','ccc','ddd');
    for ($i= 0;$i< count($urls); $i++){
      $str= $urls[$i];
      echo "This Site url is $str.<br />";
    }
?>

显示结果：

This Site url is aaa
This Site url is bbb
This Site url is ccc
This Site url is ddd

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