Question

在阅读各种帖子后，我决定不使用REGEX检查电子邮件是否有效，只使用PHP的内置filter_var函数。它似乎工作正常，直到它开始告诉我一封电子邮件无效，因为我有一个号码。

即name@domain.com有效，而name2 @domain.com则无效。

我错过了什么或者filter_var($email, FILTER_VALIDATE_EMAIL)真的非常无效吗？

Answer 1

PHP 5.3.3过滤器代码中使用的正则表达式基于Michael Rushton关于Email Address Validation的博客。它似乎适用于你提到的情况。

您还可以查看Comparing E-mail Address Validating Regular Expressions中的一些选项（目前在PHP中使用的正则表达式是其中之一）。

然后你可以选择你更喜欢的正则表达式，并在调用preg_match()时使用它。

否则你可以使用正则表达式替换文件PHP / ext / filter / logical_filter.c中的那个，函数php_filter_validate_email()，然后重建PHP。

Answer 2

name2@domain.com似乎工作正常： http://codepad.org/5HDgMW5i

但是我肯定看到人们抱怨它有问题，即使是在SO上。很有可能，它确实存在问题，但正则表达式解决方案也是如此。电子邮件地址规范非常复杂（RFC XXXX）。

这就是为什么验证您应该依赖的电子邮件的唯一解决方案是向该地址发送电子邮件并要求采取行动（例如：如果是注册脚本，则要求他们点击验证链接）。

Answer 3

该过滤器最近已经改版。 http://codepad.org/Lz5m2S2N - 似乎在键盘使用的版本中，您的案例已正确过滤

您还可以查看http://bugs.php.net/49576和http://svn.php.net/viewvc/php/php-src/trunk/ext/filter/logical_filters.c。 Regexp非常可怕。

Answer 4

function isValidEmail($email, $checkDNS = false)
{

    $valid = (
            /* Preference for native version of function */
            function_exists('filter_var') and filter_var($email, FILTER_VALIDATE_EMAIL)
            ) || (
                /* The maximum length of an e-mail address is 320 octets, per RFC 2821. */
                strlen($email) <= 320
                /*
                 * The regex below is based on a regex by Michael Rushton.
                 * However, it is not identical. I changed it to only consider routeable
                 * addresses as valid. Michael's regex considers a@b a valid address
                 * which conflicts with section 2.3.5 of RFC 5321 which states that:
                 *
                 * Only resolvable, fully-qualified domain names (FQDNs) are permitted
                 * when domain names are used in SMTP. In other words, names that can
                 * be resolved to MX RRs or address (i.e., A or AAAA) RRs (as discussed
                 * in Section 5) are permitted, as are CNAME RRs whose targets can be
                 * resolved, in turn, to MX or address RRs. Local nicknames or
                 * unqualified names MUST NOT be used.
                 *
                 * This regex does not handle comments and folding whitespace. While
                 * this is technically valid in an email address, these parts aren't
                 * actually part of the address itself.
                 */
                and preg_match_all(
                    '/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?))'.
                    '{255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?))'.
                    '{65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|'.
                    '(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))'.
                    '(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|'.
                    '(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|'.
                    '(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})'.
                    '(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126})'.'{1,}'.
                    '(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|'.
                    '(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|'.
                    '(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::'.
                    '(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|'.
                    '(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|'.
                    '(?:(?!(?:.*[a-f0-9]:){5,})'.'(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::'.
                    '(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|'.
                    '(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|'.
                    '(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD',
                    $email)
            );

    if( $valid )
    {
        if( $checkDNS && ($domain = end(explode('@',$email, 2))) )
        {
            /*
            Note:
            Adding the dot enforces the root.
            The dot is sometimes necessary if you are searching for a fully qualified domain
            which has the same name as a host on your local domain.
            Of course the dot does not alter results that were OK anyway.
            */
            return checkdnsrr($domain . '.', 'MX');
        }
        return true;
    }
    return false;
}


//-----------------------------------------------------------------

    var_dump(isValidEmail('nechtan@tagon8inc.com', true));
    // bool(true)

PHP的filter_var FILTER_VALIDATE_EMAIL实际上有效吗？

4 个答案: