If there is a match, the block of code associated with that case is. PHP 4.3.8 I can't figure out the correct syntax for the case condition in a switch statement where one of the case conditions is a NULL value. Es kommt oft vor, dass man dieselbe Variable (oder denselben Ausdruck) gegen viele verschiedene mgliche Werte prfen und abhngig davon. The value of the expression is then compared with the values for each case in the structure. There's no need to preemptively save the result in a variable either. Anweisung entspricht in etwa einer Folge von Anweisungen die jeweils den gleichen Ausdruck prfen. i handle it by just ignoring the warning and maybe add an extra.

but that is not really productive because maybe in another script you just forget the break and therefore the warning would be of use. The default statement is used if no match is found. PHP's switch doesn't just allow you to switch on the value of a particular variable: you can use any expression as one of the cases, as long as it gives a value for the case to use. the only way to get rid of the warning would be to configure the warnings, that phpstorm prints, in this case remove the warning of fall-throughs. Without having to worry about the function being re-evaluated for every case. Use break to prevent the code from running into the next case automatically. Put those many values into an array and query the array, as the switch-case seems to hide the underlying semantics of what you're trying to achieve when a string variable is used as the condition, making it harder to read and understand, e.g. Switch works more like a chain of elseif's than a series of if's.Only the first case statement that evaluates to true (when non-strictly compared to the value being switched on) will be considered a match and no further case statements will be checked. I think this fact needs a little bit more attention, so here's an example:

Passing null and false (boolean) as the variable still gets into the 0 case.

Many answers seem to focus on the ability to fall through as the reason for requiring the break statement. The difference between a series of if statements and the switch statement is that the expression you're comparing with, is evaluated only once in a switch statement. Naturally you would have expected it to be picked by the default case. I believe this question is a duplicate to this one, answered robustly by Micahel Burr. This is listed in the documentation above, but it's a bit tucked away between the paragraphs. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search

Php switch case empty