[SOLVED] switch() - deafult case: break;

[soycharliente]

I see multiple examples online and in the manual about the use of break in a switch. Some use a break statement in the default case and some don't. I was just curious if it mattered at all.

 

Any insights?

[dennismonsewicz]

yeah if you don't use the break the next switch case will evaluate along with the previous one. You can stack cases on top of each other.

 

example (stacking cases):

 

switch($action) {

case "test1":
case "test2":
//code here
break;
}

[soycharliente]

As per my original post, I am specifically talking about the default case.

[wildteen88]

You don't have to specify a default case no, you can leave this out if you so wish to. The default case will be run if none of the cases matched the argument.

[premiso]

As far as the break, no you do not have to use it. The break is under each case where you want it to stop executing without it it just runs. But since the default should be your last case or part of a case it is not necessary.

 

A few examples:

 

<?php
$page = 'index.html';

switch ($page) {
     case 'blue.html':    //this will execute if blue or yellow. 
     case 'yellow.html':

     break;
     default:              // this will execute if no data is passed in or index.html
     case 'index.html':

     break;    
}

 

That is a valid switch statement, since the default is associated with the index it will run;

 

<?php
$page = 'index.html';

switch ($page) {
     case 'index.html':

     break;
     case 'yellow.html':
    
     break;
    default:
}

 

Is also valid incase you wanted a special circumstance for the no page

 

<?php
$page = 'index.html';

switch ($page) {
     case 'index.html':

     break;
      case 'blue.html':
          // extra coding if it is blue
     case 'yellow.html':
         // coding if yellow
     break;
    default:

     break;
}

 

Is also valid but the last break is unnecessary. That is valid with the blue and yellow so if they both have the primary principles but you want to do something different if the case is blue as appose to yellow it will allow you to.

 

 

Anyhow hope that helps ya out.