PHP中如何遍歷關聯數組

在PHP中數組分為兩類： 數字索引數組和關聯數組。其中數字索引數組和C語言中的數組一樣，下標是為0，1，2…而關聯數組下標可能是任意類型，與其它語言中的hash，map等結構相似。

下面介紹PHP中遍歷關聯數組的三種方法：

foreach

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

程序運行結果：

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  />";  
}  
?>

程序運行結果：程序運行結果：

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  />";  
}  
?>

程序運行結果：

football: good  
swimming: very well  
running: not good

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