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. Please note that PHP won't throw any error/warning if your `switch` utilizes more than one `default` - in such case it will just jump to the first one. In case : ) it helps someone, I was able to clean up some hairball code by using nested switches (didn't see it mentioned here).
Use the switch statement to select one of many blocks of code to be executed.. Syntax In answer to njones at fredesign dot com, what you're seeing is the way the switch statement is supposed to work. When a match is found, and the job is done, it's time for a break. This is listed in the documentation above, but it's a bit tucked away between the paragraphs. As the doc states, switch uses loose comparison by default. Regarding [php_net at mcdragonsoftware dot com 17-Jun-2011 09:53]; the elegant function and syntax provided for an "inline switch" statement is more readable and about 25% faster than this alternative (that uses existing builtin functions), which produces the same result: Something fairly simple (and maybe obvious) that I didn't see mentioned is that the default case WILL be executed even if the switched variable does not exist or is undefined. In this contrived example, I get out of the first case of the switch statement once a condition is met. Haven't seen it mentioned here, but at least in my version (PHP 5.2.5) and I'm sure all of PHP 5, the switch statement is a great way to check type safe enumerates that are otherwise missing in the PHP language.
Die alternative Syntax für Kontrollstrukturen wird für switch Anweisungen Not sure if this has been posted or not, but I found the switch statement useful for finding ranges of data. I could have used a swich for this, but I found that using the array was much faster. It gives me a cool spool-printer-paper effect. Es kommt oft vor, dass man dieselbe Variable (oder denselben Ausdruck) gegen viele verschiedene mögliche Werte prüfen und abhängig davon unterschiedlichen Code ausführen möchte.
If the variable supplied to switch() is an integer, the cases would be converted to integer before the comparison is made (usually to zero). Create a Date With mktime() The optional timestamp parameter in the date() function specifies a timestamp. Be careful if distinguishing between NULL and (int)0. Kontrolle an die Anweisungsliste des nächsten case übergibt.
If multiple cases matches a case value, the first case is selected. Explicitly cast your variables where possible to avoid mismatch: Die folgenden beiden Beispiele zeigen zwei verschiedene Wege If no matching cases are found, the program continues to the default label.
So, for example, if you had:
switch (PHP 4, PHP 5, PHP 7) Die switch Anweisung entspricht in etwa einer Folge von if Anweisungen die jeweils den gleichen Ausdruck prüfen. The Unix timestamp contains the number of seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time specified. Es ist möglich ein Semikolon anstelle eines Doppelpunkts nach einem case zu working a bit around with it I found out that it is not possible to Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. As this example will show, the possibilities can go beyond even Duff's Device-style craziness (not that this example is nearly as clever as Duff's Device, but it demonstrates how you can do certain things other than simply the increment/decrement/assignment that's possible in C)./* Note the isolation of break; statements and the fact that default: is at the top *//* Flavors available: chocolate, strawberry, vanilla *//* Flavors available: chocolate, strawberry, vanilla */ They do.
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