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: 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