<?php
/*
Email list script
by phptutorial.info
*/
// to avoid showning errors (change to 1 to show them). For security
error_reporting(0);
// if info is posted, show the form and die
// the form is in the bottom of the page
if (!$_POST){print_form();die();}
// when info is posted you will be here
?>
<html>
<head>
<title>My mailing list</title>
</head>
<body bgcolor=FFFFFF>
<?php
// GET EMAIL
$email=$_POST["email"];
// To avoid problems, only lower case is used
$email=strtolower($email);
// Check whether email is correct by using a function
// function requires the email address and the error message
check_email ($email, "Error: email is not valid.");
// GET VALUE FOR action : subc (subscribe) or unsubc (unsubscribe)
$action=$_POST["action"];
// this is the file with the info (emails)
// When downloading the source code here, a new name for this file
// will be generated (p.e.: emaillist-2ax1fd34rfs.txt), so users will be unable to find it
$file = "emaillist-XXXXXXXXXX.txt";
// lets try to get the content of the file
if (file_exists($file)){
// If the file is already in the server, its content is pasted to variable $file_content
$file_content=file_get_contents($file);
}else{
// If the file does not exists, lets try to create it
// In case file can not be created (probably due to problems with directory permissions),
// the users is informed (the first user will be the webmaster, who must solve the problem).
$cf = fopen($file, "w") or die("Error: file does not exits, and it can not be create.
<BR>Please check permissions in the directory or create
a file with coresponding name.");
fputs($cf, "Mailing list subscribers\n");
fclose($cf);
}
// IF REQUEST HAS BEEN TO SUBSCRIBE FROM MAILING LIST, ADD EMAIL TO THE FILE
if ($action=="subc"){
// check whether the email is already registered
if(strpos($file_content,"<$email>")>0){
die("Error: your email is already included in this mailing list");
}
// write the email to the list (append it to the file)
$cf = fopen($file, "a");
fputs($cf, "\n<$email>"); // new email is written to the file in a new line
fclose($cf);
// notify subscription
print "Your email has been added to our mailing list.<br>Thanks for joining us.";
}
// IF REQUEST HAS BEEN TO UNSUBSCRIBE FROM MAILING LIST, REMOVE EMAIL FROM THE FILE
if ($action=="unsubc"){
// if email is not in the list, display error
if(strpos($file_content,"<$email>")==0){
die("Error: your email is not included in this mailing list");
}
// remove email from the content of the file
$file_content=preg_replace ("/\n<$email>/","",$file_content);
// print the new content to the file
$cf = fopen($file, "w");
fputs($cf, $file_content);
fclose($cf);
// notify unsubscription
print "Your email has been removed from our mailing list. ";
}
?>
</body>
</html>
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<?php
// THIS FUNCTION WILL CHECK WHETHER AN EMAIL IS CORRECT OR NOT
// FIRST, BASIC ARCHITECTURE IS CHECKED
// THEM, EXISTANCE OF THE EMAIL SERVER IS CHECKED
// If email is not correct, the error message is shown and page dies
function check_email ($email, $message){
// check if email exists
if ($email==""){die($message);}
// check whether email is correct (basic checking)
$test1=strpos($email, "@"); //value must be >1
$test2=strpos(substr($email,strpos($email,"@")), "."); //value must be >1
$test3=strlen($email); //value must be >6
$test4=substr_count ($email,"@"); //value must be 1
if ($test1<2 or $test2<2 or $test3<7 or $test4!=1){die($message);}
// check whether email is correct (advance checking)
// extracts whatever is after "@" to variable $email_server
$email_server=substr($email,strpos($email, "@")+1);
// Check DNS records (0 => the server exists; 1=> the server does not exist)
if (checkdnsrr($email_server)!=1){die ($message);}
}
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// THIS FUNCTION WILL SHOW THE FORM
// MODIFY IT AS REQUIRED
function print_form(){
?>
<html>
<head>
<title>My mailing list</title>
</head>
<body style="background-color: rgb(255, 255, 255);">
<center>
<div style="text-align: center;"></div>
<form action="index2.php" method="post">
<div style="text-align: center;"> </div>
<table>
<tr>
<td>
<div style="text-align: center;">
<big style="font-weight: bold;">Join my mailing list </big><br>
</div>
<input name="email" size="30" type="text"> <br>
<div style="text-align: center;">
<input name="action" value="subc" checked="checked" type="radio">Subscribe
<input name="action" value="unsubc" selected="" type="radio">Unsubscribe
<br>
</div>
<div style="text-align: center;">
<input value="Submit" type="submit">
</div>
</td>
</tr>
</table>
</form>
<!-- you may remove next line, but consider maintaining it -->
<font size="2">Script provided by <a href="http://www.phptutorial.info/">PhpTutorial.info</a>.
</font></center>
</body>
</html>
<?
}
?>
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