PHP switch statement

The `switch` statement is a conditional statement in PHP that allows you to test a variable against a list of possible values and execute different code for each value. Here's the basic syntax of a `switch` statement :

Syntax :

switch (variable) {
    case value1:
        // Code to execute if variable equals value1
        break;
    case value2:
        // Code to execute if variable equals value2
        break;
    case value3:
        // Code to execute if variable equals value3
        break;
    default:
        // Code to execute if variable doesn't equal any of the values
}â€‹

In the above syntax, `variable` is the variable that you want to test, and `value1`, `value2`, etc. are the possible values that you want to test against. The `case` statements test if `variable` equals each value in turn.

If `variable` equals `value1`, then the code inside the first set of curly braces `{}` is executed, and the `break` statement causes the switch statement to exit.

If `variable` doesn't equal `value1`, then the `case` statement for `value2` is tested, and so on. If none of the `case` statements match, then the code inside the `default` block is executed.

Here's an example of a PHP program that uses a `switch` statement to print the name of a day based on its corresponding numeric value :

Program :

<?php
	// This is a PHP program that uses a switch statement to print the name of a day based on its corresponding numeric value
	
	$day = 2; // Tuesday
	
	switch ($day) {
		case 0:
			echo "Sunday";
			break;
		case 1:
			echo "Monday";
			break;
		case 2:
			echo "Tuesday";
			break;
		case 3:
			echo "Wednesday";
			break;
		case 4:
			echo "Thursday";
			break;
		case 5:
			echo "Friday";
			break;
		case 6:
			echo "Saturday";
			break;
		default:
			echo "Invalid day";
	}
?>

Output :

Tuesday

In this code, the variable `$day` is assigned the value `2`, which corresponds to Tuesday. The `switch` statement then checks if `$day` equals each of the possible values in turn.

Since `$day` equals `2`, the code inside the third set of curly braces `{}` is executed, which prints the message "Tuesday" to the screen.

If `$day` had been assigned a value that didn't correspond to any of the possible values, the code inside the `default` block would have been executed instead, which prints the message "Invalid day" to the screen.

This demonstrates how `switch` statements can be used to test a variable against a list of possible values and execute different code for each value.