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(PHP) PHP Email Validator – Email MX DNS Record Check - mafhh14

Wed, 13 Mar 2013 19:07:33 GMT

Validating an email address is one of the hardest feats on the web. A valid email can be marketing gold, but an invalid email address is dead weight. Not only does it require a CPU-taxing PHP regular expression ("/^[A-z0-9\._-]+"."@" . "[A-z0-9][A-z0-9-]*". "(\.[A-z0-9_-]+)*"."\.([A-z]{2,6})$/"), the regular expression can be useless even after it's validated for format if the domain doesn't exist. A regular expression simply wont do -- we need to think more low-level. What does email at any domain require? A DNS MX record. Well, PHP provides a great solution to validate that there's a MX record for the provided email address' domain.

(PHP) Ultimate Email Validation PHP Function - thewickedchemist

Sat, 02 Jun 2012 14:35:49 GMT

Checks for fake DNS as well as utilizes regex functions to check the string for proper length & characters.

(PHP) POST or GET data empty check - jamepaul

Thu, 02 Sep 2010 20:48:06 GMT

I don't want to write function empty() again and again.

(PHP) ISBN validator - tomaszsobczak

Sat, 16 Jan 2010 15:22:48 GMT

(PHP) PL VATID validator - tomaszsobczak

Sat, 16 Jan 2010 15:20:25 GMT

(PHP) File v. MD5 validator - jatkins

Mon, 25 Aug 2008 13:37:04 GMT

Is that file really the file you think it is?