Question

我真的在努力做这项工作，我看过导游，但我似乎无法看到我和他们之间的区别，除了阵列的布局。

<?php
$country = array('England' => "London", 'Scotland' => "Edinburgh", 'France' => "Paris");

foreach ($capitals as $country=>$capital) {
echo "The capital of $country is $capital";
}

?>

我想要它做的就是说这个国家及其首都。

错误代码 -

Notice: Undefined variable: capitals in C:\xampp\htdocs\foreach.php on line 4

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\foreach.php on line 4

提前致谢。

Answer 1

将您的代码更改为：

（我将数组名称从country更改为capitals）

<?php

    $capitals = array('England' => "London", 'Scotland' => "Edinburgh", 'France' => "Paris");

    foreach ($capitals as $country=>$capital) {
        echo "The capital of $country is $capital<br />";
    }

?>

输出：

The capital of England is London
The capital of Scotland is Edinburgh
The capital of France is Paris

Answer 2

您正在尝试遍历不存在的数组$capitals。你必须遍历数组$country。

foreach ($country as $country=>$capital) {
    echo "The capital of $country is $capital";
}

关联数组+ Foreach语句 - 未定义的变量

2 个答案: