validate e-mail in php

if you have a form for user registration and you want to check the user mail ,if it valid or not ,it is easy just use the following check .
Note : the check here is based one the "Regular Expression"

Code:

<?php
if (eregi("^[a-zA-Z0-9_]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$]", $email)) 
{
   return FALSE;
}

?>

or put it in php function

Code:

<?php 
function checkmail($email){
    return eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email);
} 

Above , i didn't check the domain name ! . you just checked expression

Code:

[email protected]

so programmer make more checking , by checking on the domain name if it valid or not , below you can see an example for this .

Code:

<?php
list($mailusername, $Domainname) = split("@",$myemail);
if(getmxrr($Domainname, $MXHost)) 
{
   return TRUE;
}
else 
{
   if(fsockopen($Domainname, 25, $errno, $errstr, 30)) 
   {
      return TRUE; 
   }
   else 
   {
      return FALSE; 
   }
}
?>

the function getmxrr(...) and fsockopen(...) are built in functions in php library .

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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