PHP 數組遍曆方法大全(foreach,list,each)

來源:互聯網
上載者:User

在PHP中數組分為兩類: 數字索引數組和關聯陣列。
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…
而關聯陣列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中遍曆關聯陣列的三種方法:

方法1:foreach

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

輸出結果:

football: good
swimming: very well
running: not good

方法2:each

複製代碼 代碼如下:<?php
$sports = array(
'football' => 'good',
'swimming' => 'very well',
'running' => 'not good');
while ($elem = each($sports)) {
echo $elem['key'].": ".$elem['value']."<br />";
?>

方法3:list & each 複製代碼 代碼如下:<?php
$sports = array(
'football' => 'good',
'swimming' => 'very well',
'running' => 'not good');
while (list($key, $value) = each($sports)) {
echo $key.": ".$value."<br />";
?>

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