I think this may help you to resolve your problem. $error = "The value must be alphanumeric." Pages such as this: PHP switch case GET's variables and switch case GET's variable's values and others have helped, but I am at a loss as to why my switch statment does not work. PHP engine executes the case whose label matches the expression given in. $error = "The value provided is too long." Ĭase (!preg_match('/^ $/i', $foo)): switch statement with two variables at a time (6 answers) Closed 22 days ago. When there is more than one alternative choice present, we use a switch case statement. As an example, here's a simple validator written using switch: PHP comparison operators are used to compare two values and return TRUE or FALSE depending on the validity of the comparison. 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. Using fallthrough for multiple casesīecause switch will keep running code until it finds a break, it's easy enough to take the concept of fallthrough and run the same code for more than one case: Both strings are getting converted to floats, then losing precision, then becoming equal :- ( Using '' or making either of the strings non-numeric will prevent this. In many occasions, you may want to compare the same variable (or expression). In many occasions, you may want to compare the same variable (or expression) with many different values, and execute a. The switch statement is similar to a series of IF statements on the same expression. (PHP 4, PHP 5, PHP 7, PHP 8) The switch statement is similar to a series of IF statements on the same expression. If the simple case above is extended to cover case 5:Įcho "A copy of Ringworld is on its way to you!\n" If you have a switch inside a loop and wish to continue to the next iteration of the outer loop, use continue 2. The checking against true technique is just a handy little trick for situations like yours, where you need to compare a variable against complex conditions. The major caveat of switch is that each case will run on into the next one, unless you stop it with break. I think of using switch anytime I have a comparison to make against multiple possible values, whether those are numeric or strings. I won't repost the other answers because they're all correct, but I'll just add that you can't use switch for more 'complicated' statements, eg: to test if a value is 'greater than 3', 'between 4 and 6', etc. EDIT : With the release of PHP8 and the new match function, it is often a better solution to use match instead of switch. It's a piece of the language that allows you to select between different options for a value, and run different pieces of code depending on which value is set.Įach possible option is given by a case in the switch statement.Įcho "This is not the number you're looking for.\n" Gos switch is like the one in C, C , Java, JavaScript, and PHP, except that Go only. The switch statement is wondrous and magic. It runs the first case whose value is equal to the condition expression. This is exactly what the switch statement is for. In many occasions, you may want to compare the same variable (or expression) with many different values, and execute a different piece of code depending on which value it equals to. The switch case is a decision-making statement that enables switching on a single variable where that variable may have one or multiple possible values. You can use have both CASE statements as follows.Try with these following examples in this article : switch (PHP 4, PHP 5, PHP 7) The switch statement is similar to a series of IF statements on the same expression.
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