Detailed explanation of PHP's switch function (working principle)

The switch statement is a flow control statement in PHP. This article will take you through the switch statement and how to use it. I hope it will be helpful to you!

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The switch statement is used to perform different actions based on different conditions.

Switch Statement

If you want to selectively execute one of several blocks of code, use the Switch statement.

Use the Switch statement to avoid lengthy if..elseif..else code blocks.

Grammar

switch (expression)
{
case label1:
  expression = label1 时执行的代码 ;
  break;  
case label2:
  expression = label2 时执行的代码 ;
  break;
default:
  表达式的值不等于 label1 及 label2 时执行的代码;
}

Working principle:

1. Perform a calculation on the expression (usually a variable)
2. Compare the value with the value of case in the structure
3. If there is a match, execute the code associated with the case
4. After the code is executed, the break statementprevents the code from jumping to the next case Continue execution in
5. If no case is true, use the default statement

Example

<?php $favfruit="orange";

switch ($favfruit) {
   case "apple":
     echo "Your favorite fruit is apple!";
     break;
   case "banana":
     echo "Your favorite fruit is banana!";
     break;
   case "orange":
     echo "Your favorite fruit is orange!";
     break;
   default:
     echo "Your favorite fruit is neither apple, banana, or orange!";
}
?>

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