I run a small website and my users requested that I set up a mailing list. I found a simple free script that adds e-mail addresses to a protected text file, email.txt, in CSV format:
email1@yahoo.com,email2@yahoo.com,blah,blah,blah
The script works flawlessly. However, it is a nuisance to go through the file to manually remove e-mail addresses when users cancel their list subscriptions. I need to create a simple script that removes e-mail addresses.
All I want is a simple PHP script that displays a text box so users can enter their e-mail addresses and click a "Cancel Newsletter" button. The script should search the text file, find the given e-mail address and remove it and its trailing comma.
For example, say the contents of email.txt are
john@yahoo.com,peter@yahoo.com,steve@yahoo.com
If I type "peter@yahoo.com" into the text box displayed by my desired script, I want the file to look like this:
john@yahoo.com,steve@yahoo.com
UPDATE: I tried this code:
<?php
function showForm() {
echo '
<form method="post" action="">
Email Address: <input type="text" name="email"> <br />
<input type="submit" value="Cancel Newsletter" name="submit">
</form>
';
}
$_POST['email']
$to_delete = 'email';
$file = array_flip(explode(",",file_get_contents("email.txt")));
unset($file[$to_delete]);
file_put_contents("email.txt",implode(",",array_flip($file));
if(!$file_put_contents) {
die('Error occured');
} else {
echo 'Your subscription has been cancelled. You will not receive any further emails from us.';
}
}
} else {
showForm();
}
?>
This code doesn't even show the form.
UPDATE 2:
Another attempt at writing this script:
<?php
$email = $_POST["email"];
$text = file_get_contents("email.txt");
$oldWord = "$email";
$newWord = "";
$text = str_replace($oldWord , $newWord , $text);
$fp = fopen('email.txt', 'w');
fwrite($fp, $text);
fclose($file);
?>
This works as far as removing the e-mail address goes, but there is no announcement (echo). I would like for it to say either "that e-mail isn't subscribed" or "you have been removed," based on whether the script sucessfully finds the $email in the list and deletes it.
UPDATE 3 Dec. 31, 2011:
I tried the advanced code and just got a blank page, so I went back to my version. Here is the code I have now:
<html>
<body>
<form method="post" action="">
<p>Email Address: <input type="text" name="email"></p>
<input type="submit" value="Cancel Newsletter" name="submit">
</form>
<?php
$email = $_POST["email"];
$basetext = file_get_contents("email.txt");
$oldWord = "$email";
$newWord = "";
$text = str_replace($oldWord , $newWord , $basetext);
$str1 = $basetext;
// echo strlen($str1);
$str2 = $text;
// echo strlen($str2);
$fp = fopen('email.txt', 'w');
fwrite($fp, $text);
if ($str1 > $str2) { // This part handles the success/fail message
echo ("Success!");
} else {
echo ("Fail!");
}
fclose($file);
?>
</body>
</html>
This works perfectly. However, it displays the "fail" message when the page is loaded, not when triggered to load, after the submit button is pressed.
I would like to keep the original code if possible, just rearranged so that it only shows "Success!" or "Fail!" once it has executed the code.
I would like the echo messages to be the last script executed on the page.
This answer was originally appended to the question body by the OP.
First I moved the form to /cancel.html and used <form action="/cancel_submit.html">.
(Where I have written .html, it is just to demonstrate, as my server is configured to use no page extentions and also so that PHP is parsed on .html pages.)
Then I put the PHP code into the page /cancel_submit.html and moved
if ($str1 > $str2) {
echo ("You Have Successfully Unsubscribed From Our Newsletter....<br>You Will Not Receive Any More Emails From Us.");
} else {
echo ("The Email Address You Specified Is Not In Our Mailing List.");
}
to another set of PHP brackets.
This meant that the e-mail adddress was sent via POST to the other page, which then performed the actual removal of the e-mail address from the list and then checked to see if an address been removed to provide the comfirmation message.
I also added two commas to $oldword = "$email"; to make it $oldword = ",$email,"; so that it only finds the text entered into the e-mail box if it has a comma on either side. This addresses the case where someone submits half of an e-mail address.
I also changed $newWord = ""; to $newWord = ","; so that if the script removes an e-mail address with commas at each side, the two e-mail addresses that were next to it will not be separated by a comma.
Here is the code I have for both pages now:
cancel.html
<p>To cancel our Newsletter please enter your email address below....</p>
<p>
<form method="post" action="/cancel_submit.html">
<p>Email Address: <input type="text" name="email"></p>
<input type="submit" value="Cancel Newsletter" name="submit">
</form>
cancel_submit.html
<?php
$email = $_POST["email"];
$basetext = file_get_contents("email.txt");
$oldWord = ",$email,";
$newWord = ",";
$text = str_replace($oldWord , $newWord , $basetext);
$str1 = $basetext;
// echo strlen($str1);
$str2 = $text;
// echo strlen($str2);
$fp = fopen('email.txt', 'w');
fwrite($fp, $text);
fclose($file);
?>
<?php
if ($str1 > $str2) {
echo ("You Have Successfully Unsubscribed From Our Newsletter....<br>You Will Not Receive Any More Emails From Us.");
} else {
echo ("The Email Address You Specified Is Not In Our Mailing List.");
}
?>
<p>
<p>Please wait to be re-directed or <a href="http://the-flying-shuttle.com/"><u>CLICK HERE.</u></a>
</p>
EDIT:
I made a few improvements. I added:
$email = strtolower($email);
to both the e-mail add script and the e-mail remove script. This converted all characters entered into either form to lowercase; previously, it wouldnt remove e-mails typed in a different case than the big list had.
This messed up the confirmation message command, so I changed it to
if (str_replace($oldWord , $newWord , $basetext)) {
echo ("You Have Successfully Unsubscribed From Our Newsletter....<br>You Will Not Receive Any More Emails From Us.");
} else {
echo ("The Email Address You Specified Is Not In Our Mailing List.");
}