PHP switch语句“回显”错误的大小写

eqoofvh9 于 2023-01-29 发布在 PHP

关注(0)|答案(2)|浏览(166)

$year = readline('Type your year of birth: ');

$age = 2023 - $year;

switch ($age) {
    case ($age < 0):
    echo 'I don't see in the future.';
    break;
    case ($age >= 0) && ($age <= 3):
    echo 'Congrats. A newborn capable of using the PC.';
    break;
    case ($age > 3):
    echo 'Our system calculated that you are:' . ' ' . $age . ' ' . 'years old';
    break;
}

这是我第一堂PHP课的内容，如果我输入2023，语句“echoes”第一种情况，但是它应该echoes第二种情况，知道为什么会这样吗？

php

来源：https://stackoverflow.com/questions/75269905/php-switch-statement-echoing-the-wrong-case

2条答案

按热度按时间

fdx2calv1#

将switch ($age)更改为switch (true)。尝试以下操作：

switch (true) {
    case ($age < 0):
    echo "I don't see in the future.";
    break;
    case ($age >= 0) && ($age <= 3):
    echo "Congrats. A newborn capable of using the PC.";
    break;
    case ($age > 3):
    echo "Our system calculated that you are:" . " " . $age . " " . "years old";
    break;
    default:
    break;
}

赞(0）回复(0）举报 2023-01-29

0md85ypi2#

case s是值，而不是要计算的表达式。看起来您打算使用if-else：

if ($age < 0) {
    echo 'I don\'t see in the future.';
} elseif ($age >= 0) && ($age <= 3) {
    echo 'Congrats. A newborn capable of using the PC.';
} else if ($age > 3) { # Could have also been an "else", without the condition
    echo 'Our system calculated that you are:' . ' ' . $age . ' ' . 'years old';
}

赞(0）回复(0）举报 2023-01-29

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PHP switch语句“回显”错误的大小写

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