仅当一个case语句中的值和switch表达式的值匹配时 PHP 才开始执行语句,直到switch的程序段结束或者遇到第一个break语句为止。如果不在 case 的语句段最后写上break的话,PHP 将继续执行下一个 case 中的语句段。例如: <?php switch ($i) { case0: echo"i equals 0"; case1: echo"i equals 1"; case2:...
The multiple case labels method provides an elegant solution to this challenge. This section will explore how this method enhances code clarity and efficiency by handling multiple values within aswitchstatement. Imagine a scenario where you want to categorize days of the week based on their position...
Stringvariables can also be checked with multiple string values (case values) by using theswitchstatement. Example This example demonstrates the PHPswitchstatement with strings. <?php$color="Red";switch($color){case"Red":echo"Your favorite color is red.";break;case"Blue":echo"Your favorite col...
常见的注意事项: 1、case后面常量值得顺序可以任意,一般按顺序编写 2、default顺序也可以编写在switch中的任意位置 当所有case都不满足时执行default 建议default编写在所有case的后面 3、break是可有可无的 当没有编写break,则从当前第一个匹配的case一直向下运行(也就是穿透) 因此,根据题意适当编写break 4、case...
switch (expression) { case label1: //code block break; case label2: //code block; break; case label3: //code block break; default: //code block } This is how it works:The expression is evaluated once The value of the expression is compared with the values of each case If there ...
It is possible to prevent nested switch/match/if blocks by checking for multiple cases at once (just beware that PHP uses loose comparison here). ]: $result=1; break; default: $result= -1; }// $result == 1 ?> If for some cases one of the values is not important, you can use ...
It is possible to have multiple values for each case in the switch statement:Syntax switch expression { case x,y: // code block if expression is evaluated to x or y case v,w: // code block if expression is evaluated to v or w case z: ... default: // code block if...
The default case in a switch statement is executed when all the other cases evaluate to false. In programming, switch statements are used for decision making. They check a variable or an expression against various values (cases) defined in the switch block, and the code associated with the ma...
In this tutorial you will learn how to use the switch...case statement to test or evaluate an expression with different values in JavaScript.Using the Switch...Case StatementThe switch..case statement is an alternative to the if...else if...else statement, which does almost the same thing...
Sometimes you need to compare a variable to multiple values and run separate code for each one. In general, you would write if elseifelse.An excessive number of if-else statements can result in long, difficult-to-read code.Using a switch statement instead of many if-else statements can ...