PHP中遍历关联数组的方法

下面介绍PHP中遍历关联数组的三种方法：
foreach

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

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

程序运行结果：
football: good
swimming: very well
running: not good
 
each

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

while ($elem = each($sports)) {
    echo $elem['key'].": ".$elem['value']."<br />";
}
?>

程序运行结果：
football: good
swimming: very well
running: not good
 
list & each

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

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

程序运行结果：
football: good
swimming: very well
running: not good