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This article introduces the knowledge of "the specific usage of switch sentences in php". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Let's talk about the format of the switch () statement first.

Switch (expression) {

Case match 1:

When match 1 matches the code executed successfully with the expression

Break

Case match 2:

When match 2 matches the code executed successfully with the expression

Break

Default:

If the case statement does not have the code that was successfully executed with the expression

}

It is important to understand how switch is executed. Switch statements are executed one by one (actually statements are followed by statements). No code was executed at the beginning. PHP starts executing the statement only when the value in a case statement matches the value of the switch expression, until the end of the switch segment or until the first break statement is encountered. If you do not write break at the end of the statement section of the case, PHP will continue to execute the statement segment in the next case.

Example:

The copy code is as follows:

The statement in one case can also be empty, which simply transfers control to the statement in the next case, knowing that the statement block of the next case is not empty, thus implementing multiple value matching agreement blocks:

Output the same statement when the value of $I is 1 or 2 or 3:

The copy code is as follows:

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