Andrew's Three Functions

1. Alphabetic word sort

Example sentences:

1. The quick brown fox jumps over the lazy dog.

2. Mama always said life was like a box of chocolates. You never know what you're gonna get.

3. Let down and hanging around, crushed like a bug in the ground.

Enter some text to sort alphabetically:

2. Square and Square Root

Enter a number for calculation

3. Age Calculator

Enter your birth year:

Enter your birth month (1–12):

Enter your birthday (1–31):

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CODE FOLLOWS

<?php

include ("includes/header.php");

?>

<h1>Andrew's Three Functions</h1>

<h2>1. Alphabetic word sort</h2>
    <h4>Example sentences:</h4>
    <ol>
        <li>
            <p>The quick brown fox jumps over the lazy dog.</p>
        </li>
        <li>
            <p>Mama always said life was like a box of chocolates. You never know what you're gonna get.</p>
        </li>
        <li>
            <p>Let down and hanging around, crushed like a bug in the ground.</p>
        </li>
    </ol>

<form method="post" action="">
    <label for="userInputA">Enter some text to sort alphabetically:</label>
    <input type="text" name="userInputA" id="userInputA" required>
    <input type="submit" value="Submit">
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Get user input
    $raw_inputA = $_POST["userInputA"];

    // trim input
    $inputA = htmlspecialchars(trim($raw_inputA), ENT_QUOTES, 'UTF-8');

    // sort function
    $sortWords = function($inputA) {
        $clean = preg_replace("/[^\p{L}\p{N}\s]/u", "", $inputA);
        $words = preg_split("/\s+/", trim($clean));
        natcasesort($words);
        return implode(" ", $words);
    };

    // Call function
    $sortedSentence = $sortWords($inputA);

    // Display output
    echo "<p>You entered: <strong>$inputA</strong></p>";
    echo "<p>Sorted sentence: <strong>$sortedSentence</strong></p>";
}
?>

<h2>2. Square and Square Root</h2>
    <form method="post" action="">
        <label for="userInputB">Enter a number for calculation</label>
        <input type="number" name="userInputB" id="userInputB" required>
        <input type="submit" value="Submit">
    </form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {

    $raw_inputB = $_POST["userInputB"];

    $inputB = htmlspecialchars(trim($raw_inputB), ENT_QUOTES, 'UTF-8');

    // Define a function to calculate square and square root
    function calculate($inputB) {
        $square = $inputB ** 2;
        $squareRoot = sqrt($inputB);
        return [
            'square' => $square,
            'squareRoot' => $squareRoot
        ];
    }


    $num = (float)$inputB;

    $result = calculate($num);

    // Display the results
    echo "<p>You entered: <strong>$inputB</strong></p>";
    echo "<p>Square: <strong>{$result['square']}</strong></p>";
    echo "<p>Square Root: <strong>{$result['squareRoot']}</strong></p>";
}
?>

    <h2>3. Age Calculator</h2>
    <form method="post" action="">
        <label for="birthYear">Enter your birth year:</label>
        <input type="number" name="birthYear" id="birthYear" min="1900" max="<?= date('Y') ?>" required><br><br>

        <label for="birthMonth">Enter your birth month (1–12):</label>
        <input type="number" name="birthMonth" id="birthMonth" min="1" max="12" required><br><br>

        <label for="birthDay">Enter your birthday (1–31):</label>
        <input type="number" name="birthDay" id="birthDay" min="1" max="31" required><br><br>

        <input type="submit" value="Calculate Age">
    </form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Sanitize input
    $year  = (int)htmlspecialchars(trim($_POST["birthYear"]), ENT_QUOTES, 'UTF-8');
    $month = (int)htmlspecialchars(trim($_POST["birthMonth"]), ENT_QUOTES, 'UTF-8');
    $day   = (int)htmlspecialchars(trim($_POST["birthDay"]), ENT_QUOTES, 'UTF-8');

    // Age calculator
    function calculateAge($year, $month, $day) {
        $today = new DateTime();
        $birthDate = DateTime::createFromFormat('Y-n-j', "$year-$month-$day");

        // Validate date input (e.g., February 30th is invalid)
        if (!$birthDate) {
            return "Invalid date entered.";
        }

        $age = $today->diff($birthDate)->y;
        return $age;
    }

    // Call the function
    $age = calculateAge($year, $month, $day);

    if (is_numeric($age)) {
        echo "<p>You were born on <strong>$year-$month-$day</strong>.</p>";
        echo "<p>Your current age is: <strong>$age years old</strong>.</p>";
    }
}

include ("includes/footer.php");

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