我有这个功能来验证一个电子邮件地址:
function validateEMAIL($EMAIL) {
$v = "/[a-zA-Z0-9_-.+]+@[a-zA-Z0-9-]+.[a-zA-Z]+/";
return (bool)preg_match($v, $EMAIL);
}
这样可以检查电子邮件地址是否有效吗?
我有这个功能来验证一个电子邮件地址:
function validateEMAIL($EMAIL) {
$v = "/[a-zA-Z0-9_-.+]+@[a-zA-Z0-9-]+.[a-zA-Z]+/";
return (bool)preg_match($v, $EMAIL);
}
这样可以检查电子邮件地址是否有效吗?
当前回答
如果你想检查电子邮件地址提供的域名是否有效,可以使用如下方法:
/*
* Check for valid MX record for given email domain
*/
if(!function_exists('check_email_domain')){
function check_email_domain($email) {
//Get host name from email and check if it is valid
$email_host = explode("@", $email);
//Add a dot to the end of the host name to make a fully qualified domain name and get last array element because an escaped @ is allowed in the local part (RFC 5322)
$host = end($email_host) . ".";
//Convert to ascii (http://us.php.net/manual/en/function.idn-to-ascii.php)
return checkdnsrr(idn_to_ascii($host), "MX"); //(bool)
}
}
这是一种方便的方式来过滤大量无效的电子邮件地址,以及标准的电子邮件验证,因为有效的电子邮件格式并不意味着有效的电子邮件。
请注意,idn_to_ascii()(或它的姐妹函数idn_to_utf8())函数在PHP安装中可能不可用,它需要扩展PECL intl >= 1.0.2和PECL idn >= 0.1。
还要记住,IPv4或IPv6作为电子邮件中的域部分(例如user@[IPv6:2001:db8::1])不能被验证,只有命名主机可以。
点击这里查看更多信息。
其他回答
看完这里的答案后,我得出了以下结论:
public static function isValidEmail(string $email) : bool
{
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
return false;
}
//Get host name from email and check if it is valid
$email_host = array_slice(explode("@", $email), -1)[0];
// Check if valid IP (v4 or v6). If it is we can't do a DNS lookup
if (!filter_var($email_host,FILTER_VALIDATE_IP, [
'flags' => FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE,
])) {
//Add a dot to the end of the host name to make a fully qualified domain name
// and get last array element because an escaped @ is allowed in the local part (RFC 5322)
// Then convert to ascii (http://us.php.net/manual/en/function.idn-to-ascii.php)
$email_host = idn_to_ascii($email_host.'.');
//Check for MX pointers in DNS (if there are no MX pointers the domain cannot receive emails)
if (!checkdnsrr($email_host, "MX")) {
return false;
}
}
return true;
}
在FILTER_VALIDATE_EMAIL中有一个更好的正则表达式,但任何正则表达式都可能给出糟糕的结果。
例如. .
// "not an email" is invalid so its false.
php > var_export(filter_var("not an email", FILTER_VALIDATE_EMAIL));
false
// "foo@a.com" looks like an email, so it passes even though its not real.
php > var_export(filter_var("foo@a.com", FILTER_VALIDATE_EMAIL));
'foo@a.com'
// "foo@gmail.com" passes, gmail is a valid email server,
// but gmail require more than 3 letters for the address.
var_export(filter_var("foo@gmail.com", FILTER_VALIDATE_EMAIL));
'foo@gmail.com'
你可能会考虑使用像Real Email这样的API,它可以进行深入的邮箱检查,以检查电子邮件是否真实。
有点像…
$email = "foo@bar.com";
$api_key = ???;
$request_context = stream_context_create(array(
'http' => array(
'header' => "Authorization: Bearer " . $api_key
)
));
$result_json = file_get_contents("https://isitarealemail.com/api/email/validate?email=" . $email, false, $request_context);
if (json_decode($result_json, true)['status'] == "valid") {
echo("email is valid");
} else if (json_decode($result_json, true)['status'] == "invalid") {
echo("email is invalid");
} else {
echo("email was unknown");
}
如果你只是在寻找一个实际的正则表达式,允许各种点,下划线和破折号,它如下:[a-zA-z0-9.-]+\@[a-zA-z0-9.-]+.[a-zA-Z]+。这将允许像tom_anderson.1-neo@my-mail_matrix.com这样看起来相当愚蠢的电子邮件被验证。
的Python和PHP实现 正确验证任何电子邮件地址,即 邮件服务器确认是真的 域是实的。
在GPL-3.0许可下发布。
就是这样:
https://lja.fi/index.php/github-stuff/
--李雅
我认为你最好使用PHP的内置过滤器-在这种特殊情况下:
当提供FILTER_VALIDATE_EMAIL参数时,它可以返回true或false。