php如何验证邮箱格式正确性_php邮箱正则验证写法与测试

function isValidEmail($email) {
    $pattern = '/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/';
    return preg_match($pattern, $email) === 1;
}

$testEmails = [
    'user@example.com'     => true,
    'test.email@domain.co.uk' => true,
    'invalid.email'        => false,
    'missing@.com'         => false,
    'user@domain.'         => false,
    '@example.com'         => false,
    'user@'                => false,
    'user@@domain.com'     => false,
    'admin@mail-server.org' => true,
    'a@b.cc'               => true
];

foreach ($testEmails as $email => $expected) {
    $result = isValidEmail($email);
    echo "$email : " . ($result ? '有效' : '无效');
    if ($result === $expected) {
        echo " ✅\n";
    } else {
        echo " ❌ (期望: " . ($expected ? '有效' : '无效') . ")\n";
    }
}

function validateEmail($email) {
    return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
}