PHP Switch statement study notes_php basics

The Switch statement in PHP is used to perform different actions based on several different conditions.

Switch statement

Use the Switch statement if you want to selectively execute one of several blocks of code.

Use a Switch statement to avoid lengthy if..elseif..else blocks.

Syntax

Copy code The code is as follows:

switch (expression)
{
case label1:
code to be executed if expression = label1;
break;
case label2:
code to be executed if expression = label2;
break;
default:
code to be executed
if expression is different
from both label1 and label2;
}

Example

Working principle:

Perform a calculation on an expression (usually a variable)
Compare the value of the expression with the value of the case in the structure
If there is a match, execute the code associated with the case
After the code is executed, the break statement prevents the code from jumping to the next case to continue execution
If no case is true, use the default statement

Copy Code The code is as follows:

switch ($x)
{
case 1:
echo "Number 1";
break;
case 2:
echo "Number 2";
break;
case 3:
echo "Number 3";
break;
default:
echo "No number between 1 and 3";
}
?>