How to display day of the week using PHP switch

I believe everyone knows that there is a very powerful function in PHP, which is the date function. Then you can easily get the day of the week through the date function. But as the title says, this article will introduce to you how to display the day of the week through PHP switch. Friends who are interested should not miss it~

Similarly, we will introduce the problem in detail: how to write a program and use The switch/case statement displays the day of the week based on a number (for example: Monday).

The question is very clear and the answer is easy to implement:

The PHP code is as follows:

<?php
$day = "2";

switch ($day) {
    case "1":
        echo "是星期一!";
        break;
    case "2":
        echo "是星期二!";
        break;
    case "3":
        echo "是星期三!";
        break;
    case "4":
        echo "是星期四!";
        break;
    case "5":
        echo "是星期五!";
        break;
    case "6":
        echo "是星期六!";
        break;
    case "7":
        echo "是星期日!";
        break;
    default:
        echo "无效数字!";
}

The number we give here is 2, so the result The output is:

是星期二!

For the above code, we pass 1 to 7 numbers in switch, day 1 will be considered as Monday, if the number is not between 1 to 7, invalid number will be displayed by default.

Note:

In PHP, the switch statement is used to perform different actions based on different conditions. You can use the Switch statement to selectively execute one of several code blocks.

Use the Switch statement to avoid lengthy if..elseif..else code blocks.

Grammar

switch (expression)
{
case label1:
  expression = label1 时执行的代码 ;
  break;  
case label2:
  expression = label2 时执行的代码 ;
  break;
default:
  表达式的值不等于 label1 及 label2 时执行的代码;
}

Working principle:

对表达式（通常是变量）进行一次计算
把表达式的值与结构中 case 的值进行比较
如果存在匹配，则执行与 case 关联的代码
代码执行后，break 语句阻止代码跳入下一个 case 中继续执行
如果没有 case 为真，则使用 default 语句

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