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Orlando's Password Strength Checker

Instructions: A strong, secure, password is one with a strong combination of capital and lowercase letters, numbers and symbols.
Enter a password and check if it is strong by pressing the "Check Strength" button.
(Optional) To reset the form and clear your previous password. Click "Try New Password".

CODE FOLLOWS


<?php

include('includes/header.php');

?>



<h1>Orlando's Password Strength Checker</h1>

    <p>

        Instructions: A strong, secure, password is one with a strong combination of capital and lowercase letters, numbers and symbols.<br>

        Enter a password and check if it is strong by pressing the "Check Strength" button.<br>

        (Optional) To reset the form and clear your previous password. Click "Try New Password".

    </p>



    <form method="post">

        <label>Enter a password:</label><br>

        <input type="password" name="password" required>

        <button type="submit">Check Strength</button>

    </form>



<?php



// FUNCTIONS



function hasUppercase($password) {

    return preg_match('/[A-Z]/', $password);

}



function hasLowercase($password) {

    return preg_match('/[a-z]/', $password);

}



function hasNumber($password) {

    return preg_match('/[0-9]/', $password);

}



function hasSymbol($password) {

    return preg_match('/[\W_]/', $password);

}



function passwordStrength($password) {

    $score = 0;



    if (strlen($password) >= 8) $score++;

    if (hasUppercase($password)) $score++;

    if (hasLowercase($password)) $score++;

    if (hasNumber($password))    $score++;

    if (hasSymbol($password))    $score++;



    return $score;

}



function strengthLabel($score) {

    if ($score <= 2) return "Weak";

    if ($score == 3) return "Moderate";

    return "Strong";

}



// OUTPUT

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



    $password = htmlspecialchars($_POST["password"]);



    $score = passwordStrength($password);

    $label = strengthLabel($score);



    echo "<h3>Strength: $label</h3>";

    echo "<p>Score: $score / 5</p>";



    // show user input in <pre>

    echo "<h4>You Entered:</h4>";

    echo "<pre>$password</pre>";



    // button to reset the form (reload page)

    echo '<form method="get">';

    echo '<button type="submit">Try New Password</button>';

    echo '</form>';

}



?>



<?php

include('includes/footer.php');

?>

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