PHP机构电子邮件验证

Question

我想制作一个只接受我大学电子邮件地址的用户注册表。

e.g

me@gmail.com, me@yahoo.com, me@live.com = INVALID

me@university.ac.uk = VALID

我应该开始研究哪些类型的术语和查询来实现这一目标？我是PHP的新手，但是从功课开始，我到目前为止只能找到有关如何根据拒绝无效输入来验证电子邮件的教程，而不仅仅是接受有效的域扩展，例如@university.ac.uk

希望这是有道理的，不要试图为我编写代码（虽然视觉解释是有帮助的），只需要一些指示来帮助我们找到正确的方向。

Answer 1

我建议你使用电子邮件正则表达你的要求。

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rel="icon" type="image/x-icon" />

请访问此处https://regex101.com/r/KkJeho/9

Answer 2

如果您首先确定该地址是电子邮件，然后explode()该电子邮件，则可以检查该服务器是否匹配：

<?php
$email = "foo@university.ac.uk";
$allowed_servers = array("university.ac.uk", "other_server.maybe");
if (filter_var($email, "FILTER_VALIDATE_EMAIL")) {
    $check = explode("@", $email);
    if (in_array($check[1], $allowed_servers)) {
        // server checks out
    } else {
        // server doesn't check out
    }
} else {
    // invalid email address
}

Answer 3

首先，要求表单中的特定于域的电子邮件地址意味着您至少需要在服务器端使用它（提交的邮件地址需要再次检查不符合要求的用户输入）。简单来说，如果有人想要“播放”您的网站，他可以发送“错误”请求，以便将错误的信息存储在您的数据库中。 此外，它不是强制性的，但如果您想要帮助用户，您可以添加客户端验证。

就服务器端代码而言，您可以使用正则表达式来验证输入。请参阅here和here

此外，客户端代码可用于帮助用户正确提交表单。你有更多的选择：

HTML5 regex Javascript regex