How to check for a duplicate email address in PHP, considering Gmail (user.name+label@gmail.com) -

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How can I check a duplicate email address in PHP with the possibility of automatic labeler of Gmail Punctuation in mind?

For example, I want to get them identified as duplicates: 

  username@gmail.com user.name@gmail.com Username + Label @ Gmail .com user.name+label@gmail.com

In spite of this, Daniel A. White claims: In Gmail, the dots at random places before '@' (and label) are as much as you'd like User.name@gmail.com and username@gmail.com are actually the same users. 

  $ email_parse = explosion ('@', $ email); // Check whether there is a "+" and return the string before $ before_plus = strstr ($ email_ [0], '+', TRUE); $ Before_at = $ before_plus? $ Before_plus: $ email_parts [0]; // remove "." $ Before_at = str_replace ('.', '', $ Before_at); $ Email_clean = $ before_at '@'. $ Email_pairs [1];

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