How to validate an Email in PHP

Question

How can I validate the input value is a valid email address using php5  Now I am using this code   function isValidEmail  email          pattern       a-z0-9-       a-z0-9-      a-z0-9-      a-z0-9-        a-z  2 3             if  eregi  pattern   email             return true                else            return false                   but it shows deprecated error  How can I fix this issue  Please help me

User · Answer

Use    or  filter var  from http   php net manual en function filter-var php   var dump filter var  bob example com   FILTER VALIDATE EMAIL       or  EmailValidator  from https   github com egulias EmailValidator    validator   new EmailValidator     multipleValidations   new MultipleValidationWithAnd       new RFCValidation        new DNSCheckValidation        validator- gt isValid  example example com    multipleValidations     true

User · Answer

I always use this   function validEmail  email          First  we check that there s one   symbol  and that the lengths are right     if   preg match         1 64       1 255       email                Email invalid because wrong number of characters in one section  or wrong number of   symbols          return false               Split it into sections to make life easier      email array   explode       email        local array   explode       email array 0        for   i   0   i  lt  sizeof  local array    i              if   preg match       A-Za-z0-9     amp               -  A-Za-z0-9     amp                 -  0 63                 0 62           local array  i                  return false                      if   preg match        0-9             email array 1         Check if domain is IP  If not  it should be valid domain name          domain array   explode       email array 1            if  sizeof  domain array   lt  2                return false     Not enough parts to domain                   for   i   0   i  lt  sizeof  domain array    i                  if   preg match       A-Za-z0-9  A-Za-z0-9-  0 61  A-Za-z0-9     A-Za-z0-9          domain array  i                      return false                                     return true

User · Answer

Stay away from regex and filter var   solutions for validating email  See this answer  https   stackoverflow com a 42037557 953833

User · Answer

This is old post but I will share one my solution because noone mention here one problem before   New email address can contain UTF-8 characters or special domain names like  live   news etc   Also I find that some email address can be on Cyrilic and on all cases standard regex or filter var   will fail   That s why I made an solution for it   function valid email  email         if is array  email     is numeric  email     is bool  email     is float  email     is file  email     is dir  email     is int  email           return false      else                email trim strtolower  email            if filter var  email  FILTER VALIDATE EMAIL    false  return  email          else                        pattern                 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               return  preg match  pattern   email      1     email   false                      This function work perfectly for all cases and email formats

User · Answer

User data is very important for a good developer  so don t ask again   and again for same data  use some logic to correct some basic error in data    Before validation of Email  First you have to remove all illegal characters from email     This will Remove all illegal characters from email  email   filter var  email  FILTER SANITIZE EMAIL     after that validate your email address using this filter var   function   filter var  email  FILTER VALIDATE EMAIL      To Validate the email   For e g    lt  php  email    john doe example com       Remove all illegal characters from email  email   filter var  email  FILTER SANITIZE EMAIL       Validate email if  filter var  email  FILTER VALIDATE EMAIL         echo  email   is a valid email address     else       echo  email   is not a valid email address       gt

User · Answer

You can use the filter var   function  which gives you a lot of handy validation and sanitization options   filter var  email  FILTER VALIDATE EMAIL     PHP Manual filter var   Available in PHP    5 2 0   If you don t want to change your code that relied on your function  just do   function isValidEmail  email        return filter var  email  FILTER VALIDATE EMAIL      false      Note  For other uses  where you need Regex   the deprecated ereg function family  POSIX Regex Functions  should be replaced by the preg family  PCRE Regex Functions   There are a small amount of differences  reading the Manual should suffice   Update 1  As pointed out by  binaryLV       PHP 5 3 3 and 5 2 14 had a bug related to   FILTER VALIDATE EMAIL  which resulted in segfault when validating   large values  Simple and safe workaround for this is using strlen     before filter var    I m not sure about 5 3 4 final  but it is   written that some 5 3 4-snapshot versions also were affected    This bug has already been fixed   Update 2  This method will of course validate bazmega kapa as a valid email address  because in fact it is a valid email address  But most of the time on the Internet  you also want the email address to have a TLD  bazmega kapa com  As suggested in this blog post  link posted by  Istiaque Ahmed   you can augment filter var   with a regex that will check for the existence of a dot in the domain part  will not check for a valid TLD though    function isValidEmail  email        return filter var  email  FILTER VALIDATE EMAIL            amp  amp  preg match             email       As  Eliseo Ocampos pointed out  this problem only exists before PHP 5 3  in that version they changed the regex and now it does this check  so you do not have to

User · Answer

See the notes at http   www php net manual en function ereg php    Note        As of PHP 5 3 0  the regex extension is deprecated in favor of   the PCRE extension  Calling this   function will issue an E DEPRECATED   notice  See the list of differences   for help on converting to PCRE   Note        preg match    which uses a Perl-compatible regular expression   syntax  is often a faster alternative   to ereg

[php] How to validate an Email in PHP?

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