问题描述
我只是对表单进行验证，因此我决定尝试使用filter_var函数来检查我的电子邮件地址的有效性。我无法找到filter_var实际上允许在任何地方使用的内容（因为文档非常简单），并且我发现它允许使用类似test @ test的电子邮件地址。
I was just setting up the validation for a form in which I decided to try using the filter_var function to check the validity of my email address. I can not find out what filter_var actually allows anywhere though (since the documentation is very simple), and I found out that it is allowing an email address like test@test. Doesn't there have to be a .com, .net etc... in the domain?
推荐答案
域中的域是否一定没有.com，.net等...？四月左右的某个地方。请参见和。
The behavior has changed somewhere around April. See bug #49576 and revision 297350.
该电子邮件确实无效，或者至少是PHP开发人员理解的。消息来源带有此通知：
That e-mail is indeed invalid, or at least that's what the PHP developers understood. The source carries this notice:
/*
* 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.
提到了针对PHP 5.3.3和PHP 5.2.14的错误修复。
The changelog mentions this bug fix for PHP 5.3.3 and PHP 5.2.14.
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