PHP遍历关联数组的步骤介绍

PHP遍历关联数组的方法介绍

在PHP中数组分为两类： 数字索引数组和关联数组。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: goodswimming: very wellrunning: 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：程序运行结果：

 

football: goodswimming: very wellrunning: 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: goodswimming: very wellrunning: not good