PHP中遍历关联数组的方法

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

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

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

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

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