Validating email address php

The first step to creating a PHP script for validating email addresses is to work out what is and is not valid.RFC 2822, that specifies what is and is not allowed in an email address, states that the form of an email address must be of the form "local-part @ domain".The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.Validates whether the value is a valid e-mail address.Local nicknames or * unqualified names MUST NOT be used.Returns: PHP Version: 5.2.14 //On MY server, may be different depending on which version you have installed.Michael's regex considers [email protected] 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.

Now that you have your easy answer feel free to read on about email address validation if you care to learn or otherwise just use the fast answer and move on. Trying to validate an email address using a regex is an "impossible" task.

Is a PHP class that can be easily used to verify an email address and make sure it is valid and does exist on the mail server.

This class connects to the mail server and checks whether the mailbox exists or not.

As stated: "Feel free to use and redistribute this code.

But please keep this copyright notice."This pattern is extremely complex in case you need to use it with function like "preg_match_all" over big text string with emails inside. I mean if you want to: preg_match_all($pattern, $text_string, $matches); then this complex pattern will overload the server if you need to parse really big [email protected] Haa: Postfix 3.0 supports it for almost two years now: postfix.org/SMTPUTF8_, and it is included in Ubuntu 16.04 and will be included in the next Debian release, for example. Webmail providers like Gmail have also added support for sending/receiving such emails, although you cannot yet create unicode accounts.

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