Search Functionality

Part of the Object Oriented Programming section of Coddy's PHP journey. Lesson 85 of 91.

Challenge

Easy

Let's enhance our Library Management System by adding search functionality. Users need to find books easily, whether they're looking for a specific title, browsing by author, or checking what's currently available to borrow.

You'll organize your code across four files:

Book.php — Your Book class with readonly properties (isbn, title, author), a private $isAvailable property starting as true, and methods: isAvailable(), markAsBorrowed(), and markAsReturned().
User.php — Include the Book file. Your User class with readonly properties (id, name), a private $borrowedBooks array, a MAX_BOOKS constant of 3, and methods: getBorrowedBooks(), canBorrow(), addBook(Book $book), and removeBook(string $isbn).
Library.php — Include the User file. Expand your Library class with the existing functionality plus three new search methods:
- searchByTitle(string $keyword): array — returns all books where the title contains the keyword (case-insensitive)
- searchByAuthor(string $author): array — returns all books where the author name contains the search term (case-insensitive)
- getAvailableBooks(): array — returns only books that are currently available for borrowing
Use array_filter with arrow functions and stripos for case-insensitive matching. Remember that stripos returns false when no match is found, so check for !== false.
main.php — Include the Library file. You'll receive two inputs: a search keyword and an author name.
Create a Library and add these four books:
- ISBN: "978-0", Title: "PHP Basics", Author: "John Smith"
- ISBN: "978-1", Title: "Advanced PHP", Author: "Jane Doe"
- ISBN: "978-2", Title: "Python Guide", Author: "John Smith"
- ISBN: "978-3", Title: "Web Development", Author: "Alice Brown"
Borrow the book with ISBN "978-1" using a User with ID 1 and name "TestUser".

Then perform these searches and print the results:
1. Search by title using the first input, print each matching book's title on a new line
2. Search by author using the second input, print the count of matching books
3. Get available books and print the count
Output format:
```
Title matches:
[title1]
[title2]
...
Author matches: [count]
Available: [count]
```

This challenge demonstrates how array_filter combined with stripos creates powerful, user-friendly search functionality. The case-insensitive matching means users don't need to worry about exact capitalization when searching.

Try it yourself

<?php

require_once 'Library.php';

// Read inputs
$searchKeyword = trim(fgets(STDIN));
$authorName = trim(fgets(STDIN));

// TODO: Create a Library instance

// TODO: Add the four books to the library:
// ISBN: "978-0", Title: "PHP Basics", Author: "John Smith"
// ISBN: "978-1", Title: "Advanced PHP", Author: "Jane Doe"
// ISBN: "978-2", Title: "Python Guide", Author: "John Smith"
// ISBN: "978-3", Title: "Web Development", Author: "Alice Brown"

// TODO: Create a User with ID 1 and name "TestUser", register them

// TODO: Borrow the book with ISBN "978-1"

// TODO: Search by title using $searchKeyword and print results
echo "Title matches:\n";
// Print each matching book's title on a new line

// TODO: Search by author using $authorName and print the count
echo "Author matches: " . /* count here */ "\n";

// TODO: Get available books and print the count
echo "Available: " . /* count here */ "\n";

?>