php遍历关联数组的三种方法

<?php    $sports1 = array('football' =>'good' ,                    'basketball'=>'bad',                    'volleyball'=>'well' );    $sports2 = array('football' =>'good' ,                    'basketball'=>'bad',                    'volleyball'=>'well' );    $sports3 = array('football' =>'good' ,                    'basketball'=>'bad',                    'volleyball'=>'well' );    //method 1    foreach ($sports1 as $key => $value) {        echo $key.":".$value." <br />";    }    //method 2    while ($element = each($sports2)) {        echo $element['key'].": ".$element['value']."<br />";    }    //method 3    while (list($key,$value) = each($sports3)) {        echo $key.": ".$value."<br />";    }?>