PHP: else if statement

The getTypeOfSentence() function from the previous lesson only distinguishes between questions and normal sentences. Let's try to extend it to exclamation sentences:

<?php

function getTypeOfSentence($sentence)
{
    $lastChar = $sentence[-1];

    if ($lastChar === '!') {
        $sentenceType = 'exclamation';
    } else {
        $sentenceType = 'normal';
    }

    if ($lastChar === '?') {
        $sentenceType = 'question';
    }

    return "Sentence is {$sentenceType}";
}

getTypeOfSentence('Who?'); // 'Sentence is question'
getTypeOfSentence('No');   // 'Sentence is normal'
getTypeOfSentence('No!');  // 'Sentence is exclamation'

We've added one more check. Technically, the function works, but there are semantics issues.

• It checks for a question mark in any case, regardless of whether an exclamation point was found or not.
• The else branch is defined for the first condition, not for the second.

It would be better to use another conditional construction:

<?php

function getTypeOfSentence($sentence)
{
    $lastChar = $sentence[-1];

    if ($lastChar === '?') {
        $sentenceType = 'question';
    } elseif ($lastChar === '!') {
        $sentenceType = 'exclamation';
    } else {
        $sentenceType = 'normal';
    }

    return "Sentence is {$sentenceType}";
}

Now all the conditions are lined up in a single construction. elseif is "if the previous condition is not satisfied, but the current condition is satisfied". This is the scenario we get:

• If the last character is ?, then it's a 'question'
• otherwise, if the last character is !, then it's an 'exclamation'
• otherwise 'normal'

Only one of the code blocks belonging to the entire if construct will be executed.

Instructions

The digital map of Westeros that Sam has made shows Stark allies in green, enemies in red, and neutral families in gray.

Write a function called whoIsThisHouseToStarks() for Sam that takes the family name as input and returns one of three values: 'friend', 'enemy', 'neutral'.

Rules:

• Friends ('friend'): 'Karstark', 'Tully'
• Enemies ('enemy'): 'Lannister', 'Frey'
• Any other families are considered neutral

Call examples:

<?php

whoIsThisHouseToStarks('Karstark'); // 'friend'
whoIsThisHouseToStarks('Frey');     // 'enemy'
whoIsThisHouseToStarks('Joar');     // 'neutral'
whoIsThisHouseToStarks('Ivanov');   // 'neutral'