PHP遍歷關聯數組的幾種方法

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：

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