PHP Switch statement

The switch statement is used to perform different actions based on multiple different conditions.

We have learned the if...else statement to determine conditions before, but it is inefficient. Is there any other better way? One way we can use is:switch...casesyntax. The syntax structure of

switch...case is as follows:

switch(expr)

##{

case expr1:

statement ;

break;

case expr2:

statement;

break;

……

default:

statement;

}

The switch statement is similar to a series of if statements with the same expression

Each case will be judged in turn, expr Is it equal to expr1..n? If equal, the corresponding statement will be executed. If there is a break at the end, the switch statement will jump out after the execution is completed.

default is the default operation performed when all cases cannot be satisfied

Notes:

1. Do not write a semicolon after case, followed by a colon:

2. Do not write a judgment interval after case. For example ($foo > 20 or $foo == 30)

3. The variables in switch are preferably integers or strings, because Boolean judgment is more suitable for if...else..

4. If you remove the break in each case, then the code blocks in each case will be executed in sequence until

5. The switch statement does not need to be written default, but as a good habit, it is recommended to keep the default statement

Instance

       

       

       
## Example
       

Let’s write a simple week judgment:
       

       
'; }
       
       
Look at what day it is today.