elseif Statement - PHP - P26

When you have more than 2 outcomes in your decision making, you're going to need to use the elseif statement. The elseif keyword goes in between the if and the else keywords. Your primary condition is handled by the if statement. If the condition is met inside of the if statement, there's no point in testing any other conditions. The code that's inside of the if statement body is executed and the remainder of the elseif/else statements are skipped.

When the condition is not met, PHP will check the elseif statements next. If a condition matches, the code inside of that particular elseif statement body will execute and PHP will skip the remainder of the elseif/else testing.

If no conditions are met, the PHP will execute the code inside of the else statement body.

The anatomy of the if/elseif/else statement looks like this:

if ( conditional expression ) {
expression
} elseif ( conditional expression ) {
expression
} else {
expression
}

Time for a quick example. If we did everything correctly, only one expression will execute inside of the if/elseif/else structure.

$car = "Corvette";

if ( $car == "Subaru" ) {
echo "Subie Wave";
} elseif ( $car == "Jeep" ) {
echo "Jeep Wave";
} elseif ( $car == "Corvette" ) {
echo "Corvette Wave";
} else {
echo "No Wave";
}

Let's see what PHP does when evaluating the code above.

1. PHP assigns the value Corvette to the $car variable.
2. PHP encounters the if statement. It tests to see if the value that's stored inside of the $car variable is equal to Subaru. Since it's not, it moves on to the elseif statement.
3. It tests to see whether the value that's stored inside of the $car variable is equal to Jeep. Since it's not, it moves on to the next statement.
4. PHP tests to see whether the value that's stored inside of the $car variable is equal to Corvette. It is.
5. PHP executes the code inside of that elseif statement. PHP outputs Corvette Wave.
6. It skips over the else statement since it already found a match.

Read the full article on my website
https://www.dinocajic.com/php-elseif-statement/

Code for this tutorial
https://github.com/dinocajic/php-7-youtube-tutorials/blob/master/26%20Else%20If%20Statements.php

Full Code
https://github.com/dinocajic/php-7-youtube-tutorials

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