try checking for the value

if (isset($_POST["op"] != "addpost")) {

or to supress the error, use the '@' symbol in fron of the $_POST or $_GET

if (@$_POST["op"] != "addpost") {


Subject: [PHP-DB] error
Date: Tue, 28 Sep 2004 06:58:10 EDT

Dear friends,

Script writes to database, however gives this error while on internet web
server, on local host doesn't give same error.

Any guidance, please

Thank you
Back to Main
Notice: Undefined index: op in
\\premfs15\sites\premium15\mrbushforpeace\webroot\replytopost.php on line 9
code of php script
<a href="">Back to Main</a>

//connect to server and select database; we'll need it soon
$conn = mysql_connect("", "mrbushforpeace",
"poilkjmnb") or die(mysql_error());
mysql_select_db("mrbushforpeace",$conn)  or die(mysql_error());

//check to see if we're showing the form or adding the post
if ($_POST["op"] != "addpost") {
   // showing the form; check for required item in query string
   if (!$_GET["post_id"]) {
        header("Location: topiclist.php");

//still have to verify topic and post
$verify = "select ft.topic_id, ft.topic_title from forum_posts as fp left
join forum_topics as ft on fp.topic_id = ft.topic_id where fp.post_id =
$verify_res = mysql_query($verify, $conn) or die(mysql_error());
if (mysql_num_rows($verify_res) < 1) {
//this post or topic does not exist
header("Location: topiclist.php");
} else {
//get the topic id and title
$topic_id = mysql_result($verify_res,0,'topic_id');
$topic_title = stripslashes(mysql_result($verify_res,

       print "
       <title>Post Your Reply in $topic_title</title>
       <h1>Post Your Reply in $topic_title</h1>
       <form method=post action=\"$_SERVER[PHP_SELF]\">
       <p><strong>Your E-Mail Address:</strong><br>
       <input type=\"text\" name=\"post_owner\" size=40 maxlength=150>

<P><strong>Post Text:</strong><br>
<textarea name=\"post_text\" rows=8 cols=40 wrap=virtual></textarea>

       <input type=\"hidden\" name=\"op\" value=\"addpost\">
       <input type=\"hidden\" name=\"topic_id\" value=\"$topic_id\">

       <P><input type=\"submit\" name=\"submit\" value=\"Add Post\"></p>

} else if ($_POST["op"] == "addpost") {
   //check for required items from form
   if ((!$_POST["topic_id"]) || (!$_POST["post_text"]) ||
(!$_POST["post_owner"])) {
       header("Location: topiclist.php");

   //add the post
   $add_post = "insert into forum_posts values ('', '$_POST[topic_id]',
'$_POST[post_text]', now(), '$_POST[post_owner]')";
   mysql_query($add_post,$conn) or die(mysql_error());

   //redirect user to topic


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