Hi I have an error on a test project for a mailing list manager using php & mysql it includes two scripts one that defines functions to be included in the other:
<?
//set up a couple of functions for use by scripts in ch19
function doDB() {
global $mysqli;
//connect to server and select database; you may need it
$mysqli = mysqli_connect("localhost", "root", "millcnc", "testDB");
//if connection fails, stop script execution
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
}
function emailChecker($email) {
global $mysqli, $check_res;
//check that email is not already in list
$check_sql = "SELECT id FROM subscribers WHERE email = '".$email."'";
$check_res = mysqli_query($mysqli, $check_sql) or die(mysqli_error($mysqli));
}
?>
And one that manages the mailing list table itself:
<?php
include("ch19_include.php");
//determine if they need to see the form or not
if (!$_POST) {
//they need to see the form, so create form block
$display_block = "
<form method=\"POST\" action=\"".$_SERVER["PHP_SELF"]."\">
<p><strong>Your E-Mail Address:</strong><br/>
<input type=\"text\" name=\"email\" size=\"40\" maxlength=\"150\">
<p><strong>Action:</strong><br/>
<input type=\"radio\" name=\"action\" value=\"sub\" checked> subscribe
<input type=\"radio\" name=\"action\" value=\"unsub\"> unsubscribe
<p><input type=\"submit\" name=\"submit\" value=\"Submit Form\"></p>
</form>";
} else if (($_POST) && ($_POST["action"] == "sub")) {
//trying to subscribe; validate email address
if ($_POST["email"] == "") {
header("Location: manage.php");
exit;
} else {
//connect to database
doDB();
//check that email is in list
emailChecker($_POST["email"]);
//get number of results and do action
if (mysqli_num_rows($check_res) < 1) {
//free result
mysqli_free_result($check_res);
//add record
$add_sql = "INSERT INTO subscribers (email) VALUES('".$_POST["email"]."')";
$add_res = mysqli_query($mysqli, $add_sql) or die(mysqli_error($mysqli));
$display_block = "<p>Thanks for signing up!</p>";
//close connection to MySQL
mysqli_close($mysqli);
} else {
//print failure message
$display_block = "<p>You're already subscribed!</p>";
}
}
} else if (($_POST) && ($_POST["action"] == "unsub")) {
//trying to unsubscribe; validate email address
if ($_POST["email"] == "") {
header("Location: manage.php");
exit;
} else {
//connect to database
doDB();
//check that email is in list
emailChecker($_POST["email"]);
//get number of results and do action
if (mysqli_num_rows($check_res) < 1) {
//free result
mysqli_free_result($check_res);
//print failure message
$display_block = "<p>Couldn't find your address!</p>
<p>No action was taken.</p>";
} else {
//get value of ID from result
while ($row = mysqli_fetch_array($check_res)) {
$id = $row["id"];
}
//unsubscribe the address
$del_sql = "DELETE FROM subscribers WHERE id = '".$id."'";
$del_res = mysqli_query($mysqli, $del_sql) or die(mysqli_error($mysqli));
$display_block = "<P>You're unsubscribed!</p>";
}
mysqli_close($mysqli);
}
}
?>
<html>
<head>
<title>Subscribe/Unsubscribe to a Mailing List</title>
</head>
<body>
<h1>Subscribe/Unsubscribe to a Mailing List</h1>
<?php echo "$display_block"; ?>
</body>
</html>
Apache returns this:
[Sat Feb 07 14:50:48 2009] [error] [client 127.0.0.1] PHP Warning: mysqli_error() expects parameter 1 to be mysqli, null given in C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\ch19_include.php on line 23, referer: http://localhost/manage.php
I cannot see an obvious error in either script does anyone have any advice?
many thanks
PS I am running the latest versions of Mysql, PHP and Apache on Windows XP.
