<?php

$fruit=array('蘋(píng)果','香蕉','菠蘿');

foreach($fruit as $key=>$value){

? ? echo '<br>第'.$key.'值是：'. $value;

}

?>

如上代碼：$fruit =?array('蘋(píng)果','香蕉','菠蘿')數(shù)組，其實(shí)array('蘋(píng)果','香蕉','菠蘿')也等于array('0' => '蘋(píng)果', '1' => '香蕉', '2' => '菠蘿')

$key => $value 對(duì)應(yīng) 鍵 => 值,不清楚可以再仔細(xì)看看 索引數(shù)組 相關(guān)資料

$fruit是數(shù)組，key是鍵，value是值的意思，如果$fruit是牽引數(shù)組，key默認(rèn)是從零開(kāi)始的，$fruit=array("蘋(píng)果","香蕉","橘子"); ?,如果$fruit是關(guān)聯(lián)數(shù)組key的值可以自己定義，$fruit = array("pingguo"=>"蘋(píng)果","xiangjiao"=>"香蕉","juzi"=>"橘子");

如果$fruit=['name'=>'lxm','age'=>18];
則輸出:
namelxm
age18

foreach($fruit as $key=>$value)

{

????echo $key,$value,"<br/>";

}

用于遍歷數(shù)組$fruit;

比如$fruit=['a','b','c'];

則輸出

0a

1b

2c