PHP &amp; E-mail Validation

PHP & E-mail Validation

abasel

I have a form whose action call the following code

processcontactus.php

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

list($Username, $Domain) = split("@",$email);

if(getmxrr($Domain, $MXHost))
{
return TRUE;
}
else
{
if(fsockopen($Domain, 25, $errno, $errstr, 30))
{
return TRUE;
}
else
{
return FALSE;
}
}
}
@extract($_POST);
$frm_FirstName = stripslashes($frm_FirstName);
$frm_Surname = stripslashes($frm_Surname);
$frm_Email = stripslashes($frm_Email);
$frm_Country = stripslashes($frm_Country);
$frm_Subject = stripslashes($frm_Subject);
$frm_Feedback = stripslashes($frm_Feedback);
if(checkEmail($frm_Email) == FALSE)
{
echo "E-mail entered is not valid.";
}
else
{
mail('example@example.com',"$frm_Subject: $frm_Country",$frm_Feedback,"From: $frm_FirstName $frm_Surname <$frm_Email>");
}
header('Location: http://dev.internetlinked.com/indexpages.php?id=5');
?>

When I try and use it I get

Warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/intern/public_html/dev/processcontactus.php on line 17

Warning: fsockopen() [function.fsockopen]: unable to connect to :25 in /home/intern/public_html/dev/processcontactus.php on line 17
E-mail entered is not valid.
Warning: Cannot modify header information - headers already sent by (output started at /home/intern/public_html/dev/processcontactus.php:17) in /home/intern/public_html/dev/processcontactus.php on line 42

The above code was obtained from

http://www.spoono.com/php/tutorials/tutorial.php?id=41

The actual page that I'm trying to get to work can be found at
http://dev.internetlinked.com/indexpages.php?id=5

What am I doing wrong?

bradgrafelman

Looks like it's working perfectly... no errors were displayed when I used a valid e-mail address, but I got the error message when I entered an invalid one.

So... I guess I just don't know what your question is?

EDIT: Also, when posting PHP code, please use the board's [PHP][/PHP] bbcode tags - they make the code much, much easier to read (as well as aiding the diagnosis of syntax errors). You should edit your post now and add these bbcode tags to help others in reading/analyzing your code.

abasel

When entering an invalid e-mail I should get a constructive error message .i.e. E-mail entered is not valid.

Instead I get

Warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/intern/public_html/dev/processcontactus.php on line 17

I'm not sure what I'm doing wrong.

NogDog

You can prepend the fsockopen() calls with a "@" to suppress error reporting. However, this will not do anything for the final warning (cannot modify header information), as you are outputting your error message and then trying to do a header() command. In that case, you might need to use a HTML meta redirect instead of the PHP header() function.

bradgrafelman

OR, you can do a redirect to "/path/to/script.php?invalidemail=1", and then on the form, you'd check if the invalidemail was set in the query string and, if so, display a nicely formatted error message on the form.

Weedpacket

Just idly, see the note on the [man]getmxrr[/man] page about its use in email address verification.