PHPでコマンドラインからの入力をバリデートする方法を徹底解説

echo "Please enter your name: ";
$name = trim(fgets(STDIN));
echo "Hello, $name!";

$name = readline("Please enter your name: ");
echo "Hello, $name!";

$input = "Hello, world!";
if (!empty($input) && strlen($input) <= 50) {
    echo "Valid string input.";
} else {
    echo "Invalid string input.";
}

$number = "42";
if (is_numeric($number) && $number >= 0 && $number <= 100) {
    echo "Valid number input.";
} else {
    echo "Invalid number input.";
}

$date = "2024-10-26";
$dateObj = DateTime::createFromFormat('Y-m-d', $date);
if ($dateObj && $dateObj->format('Y-m-d') === $date) {
    echo "Valid date input.";
} else {
    echo "Invalid date input.";
}

$input = "true";
if (filter_var($input, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE) !== null) {
    echo "Valid boolean input.";
} else {
    echo "Invalid boolean input.";
}

if (preg_match('/正規表現パターン/', $input)) {
    echo "入力がパターンに一致しました。";
} else {
    echo "入力がパターンに一致しません。";
}

$email = "example@domain.com";
if (preg_match('/^[\w\-\.]+@([\w\-]+\.)+[\w\-]{2,4}$/', $email)) {
    echo "Valid email address.";
} else {
    echo "Invalid email address.";
}

$phoneNumber = "+1-123-456-7890";
if (preg_match('/^\+?[0-9]{1,4}?[-. ]?(\(?\d{1,4}\)?[-. ]?)?\d{1,4}[-. ]?\d{1,4}[-. ]?\d{1,9}$/', $phoneNumber)) {
    echo "Valid phone number.";
} else {
    echo "Invalid phone number.";
}

$postalCode = "123-4567";
if (preg_match('/^\d{3}-\d{4}$/', $postalCode)) {
    echo "Valid postal code.";
} else {
    echo "Invalid postal code.";
}

$password = "P@ssw0rd123";
if (preg_match('/^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!%*#?&]{8,}$/', $password)) {
    echo "Strong password.";
} else {
    echo "Weak password.";
}

echo "Enter your username: ";
$username = trim(fgets(STDIN));

if (empty($username)) {
    echo "Username is required.\n";
} else {
    echo "Hello, $username!\n";
}

echo "Enter your age (optional): ";
$age = trim(fgets(STDIN));

if (!empty($age)) {
    if (is_numeric($age) && $age > 0 && $age < 120) {
        echo "Your age is $age.\n";
    } else {
        echo "Invalid age entered. Please enter a number between 1 and 119.\n";
    }
} else {
    echo "Age is not provided.\n";
}

echo "Enter your favorite color (default is blue): ";
$color = trim(fgets(STDIN));

if (empty($color)) {
    $color = "blue";
}
echo "Your favorite color is $color.\n";

echo "Enter your first name: ";
$firstName = trim(fgets(STDIN));

echo "Enter your last name: ";
$lastName = trim(fgets(STDIN));

if (empty($firstName) || empty($lastName)) {
    echo "Both first and last names are required.\n";
} else {
    echo "Hello, $firstName $lastName!\n";
}

$input = "<script>alert('Hello');</script>";
$sanitizedInput = filter_var($input, FILTER_SANITIZE_STRING);
echo "Sanitized input: $sanitizedInput";

$input = "<div>Hello, World!</div>";
$escapedInput = htmlspecialchars($input, ENT_QUOTES, 'UTF-8');
echo "Escaped input: $escapedInput";

$dbh = new PDO('mysql:host=localhost;dbname=test', 'user', 'pass');
$stmt = $dbh->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':email', $email);
$stmt->execute();

$userInput = "<script>alert('Hack!');</script>";
$sanitized = filter_var($userInput, FILTER_SANITIZE_STRING);
$escaped = htmlspecialchars($sanitized, ENT_QUOTES, 'UTF-8');
echo "Processed input: $escaped";

echo "Enter your age: ";
$age = trim(fgets(STDIN));

if (!is_numeric($age) || $age < 0 || $age > 120) {
    echo "Error: Please enter a valid age between 0 and 120.\n";
} else {
    echo "Your age is $age.\n";
}

echo "Enter your email address: ";
$email = trim(fgets(STDIN));

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Error: The email address is not valid. Please enter a valid email in the format 'example@domain.com'.\n";
} else {
    echo "Your email is $email.\n";
}

function validateUsername($username) {
    if (empty($username)) {
        throw new Exception("Username cannot be empty.");
    }
    if (strlen($username) < 5) {
        throw new Exception("Username must be at least 5 characters long.");
    }
    return true;
}

echo "Enter your username: ";
$username = trim(fgets(STDIN));

try {
    validateUsername($username);
    echo "Username is valid.\n";
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
}

echo "Enter a number between 1 and 10: ";
$number = trim(fgets(STDIN));

if ($number < 1 || $number > 10) {
    echo "Warning: The number is out of range. Please try again.\n";
} else {
    echo "You entered $number.\n";
}

$errorMessage = "Failed to validate input.";
error_log($errorMessage, 3, "/var/log/php_errors.log");
echo "An error occurred. Please contact support.\n";

composer require respect/validation

require 'vendor/autoload.php';

use Respect\Validation\Validator as v;

$username = "johnDoe";

if (v::alpha()->length(5, null)->validate($username)) {
    echo "Valid username.\n";
} else {
    echo "Invalid username.\n";
}

composer require symfony/validator

require 'vendor/autoload.php';

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints as Assert;

$validator = Validation::createValidator();
$age = 20;

$violations = $validator->validate($age, [
    new Assert\NotBlank(),
    new Assert\GreaterThanOrEqual(18),
]);

if (0 === count($violations)) {
    echo "Valid age.\n";
} else {
    echo "Invalid age.\n";
}

$email = "test@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Valid email address.\n";
} else {
    echo "Invalid email address.\n";
}

composer require vlucas/valitron

require 'vendor/autoload.php';

use Valitron\Validator;

$data = [
    'name' => 'John Doe',
    'email' => 'john.doe@example.com',
    'age' => 25
];

$v = new Validator($data);
$v->rule('required', ['name', 'email', 'age']);
$v->rule('email', 'email');
$v->rule('integer', 'age');

if ($v->validate()) {
    echo "All inputs are valid.\n";
} else {
    echo "Some inputs are invalid.\n";
}

function getUserInput($prompt) {
    echo $prompt;
    return trim(fgets(STDIN));
}

// ユーザー名の取得とバリデーション
$username = getUserInput("Enter your username (at least 5 characters): ");
if (empty($username) || strlen($username) < 5) {
    echo "Error: Username must be at least 5 characters long.\n";
    exit(1);
}

// メールアドレスの取得とバリデーション
$email = getUserInput("Enter your email address: ");
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Error: Invalid email format.\n";
    exit(1);
}

// パスワードの取得とバリデーション
$password = getUserInput("Enter your password (at least 8 characters, include a number and special character): ");
if (!preg_match('/^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!%*#?&]{8,}$/', $password)) {
    echo "Error: Password must be at least 8 characters long and include at least one number and one special character.\n";
    exit(1);
}

echo "Registration successful! Welcome, $username.\n";

function getValidatedNumber($prompt) {
    while (true) {
        echo $prompt;
        $input = trim(fgets(STDIN));
        if (is_numeric($input)) {
            return (float)$input;
        } else {
            echo "Error: Please enter a valid number.\n";
        }
    }
}

$number1 = getValidatedNumber("Enter the first number: ");
$number2 = getValidatedNumber("Enter the second number: ");

$result = $number1 + $number2;
echo "The sum of $number1 and $number2 is $result.\n";

$file = 'data.csv';
if (!file_exists($file) || !is_readable($file)) {
    echo "Error: CSV file not found or not readable.\n";
    exit(1);
}

$handle = fopen($file, 'r');
while (($row = fgetcsv($handle)) !== false) {
    list($name, $email, $age) = $row;

    // 名前のバリデーション
    if (empty($name)) {
        echo "Error: Name cannot be empty.\n";
        continue;
    }

    // メールアドレスのバリデーション
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        echo "Error: Invalid email format for $name.\n";
        continue;
    }

    // 年齢のバリデーション
    if (!is_numeric($age) || $age < 0 || $age > 120) {
        echo "Error: Invalid age for $name. Age must be a number between 0 and 120.\n";
        continue;
    }

    echo "Valid entry: Name: $name, Email: $email, Age: $age\n";
}

fclose($handle);

function validateForm($data) {
    $errors = [];

    // ユーザー名のバリデーション
    if (empty($data['username']) || strlen($data['username']) < 5) {
        $errors[] = "Username must be at least 5 characters long.";
    }

    // メールアドレスのバリデーション
    if (!filter_var($data['email'], FILTER_VALIDATE_EMAIL)) {
        $errors[] = "Invalid email format.";
    }

    // 年齢のバリデーション
    if (!is_numeric($data['age']) || $data['age'] <= 0 || $data['age'] > 120) {
        $errors[] = "Age must be a number between 1 and 120.";
    }

    return $errors;
}

// サンプルデータ
$formData = [
    'username' => getUserInput("Enter your username: "),
    'email' => getUserInput("Enter your email: "),
    'age' => getUserInput("Enter your age: ")
];

$errors = validateForm($formData);
if (empty($errors)) {
    echo "All inputs are valid. Registration successful!\n";
} else {
    echo "The following errors occurred:\n";
    foreach ($errors as $error) {
        echo "- $error\n";
    }
}