snowpackages
New member
Trying to create a simple forum - having issues with an error i keep getting on line 13... error message is "Warning: Undefined array key "op" in C:\xampp\htdocs\website\replytopost.php on line 13" The following code has the line 13 error. Can this error be from the caller file? Can't seem to find the bug... thanks for the assist
I'll include the caller file below...
PHP:
<?php
//connect to server and select database; we'll need it soon
$conn = mysqli_connect($dbhost, $dbuser, $dbpass)
or die(mysqli_error($conn));
mysqli_select_db($conn,$dbname) or die(mysqli_error($conn));
//check to see if we're showing the form or adding the post
if ($_POST['op'] != "addpost") {
// showing the form; check for required item in query string
if (!$_GET['post_id']) {
header("Location: topiclist.php");
exit;
}
//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 = $_GET[post_id]";
$verify_res = mysqli_query($conn,$verify ) or die(mysqli_error($conn));
if (mysqli_num_rows($verify_res) < 1) {
//this post or topic does not exist
header("Location: topiclist.php");
exit;
} else {
//get the topic id and title
$topic_id = mysqli_result($verify_res,0,'topic_id');
$topic_title = stripslashes(mysqli_result($verify_res,
0,'topic_title'));
print "
<html lang='en-us'>
<head>
<title>Post Your Reply in $topic_title</title>
</head>
<body>
<h1>Post Your Reply in $topic_title</h1>
<form method=post action=\"$_SERVER[PHP_SELF]\" name= 'addpost'>
<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=\"$topic_id\">
<P><input type=\"submit\" name=\"addpost\" value=\"Add Post\"></p>
</form>
</body>
</html>";
}
} else if ($_POST['op'] == "addpost") {
//check for required items from form
if ((!$_POST['topic_id']) || (!$_POST['post_text']) ||
(!$_POST['post_owner'])) {
header("Location: topiclist.php");
exit;
}
//add the post
$add_post = "insert into forum_posts values ('', '$_POST[topic_id]',
'$_POST[post_text]', now(), '$_POST[post_owner]')";
mysqli_query($conn,$add_post) or die(mysqli_error($conn));
//redirect user to topic
header("Location: showtopic.php?topic_id=$topic_id");
exit;
}
function mysqli_result($res,$row=0,$col=0){
$numrows = mysqli_num_rows($res);
if ($numrows && $row <= ($numrows-1) && $row >=0){
mysqli_data_seek($res,$row);
$resrow = (is_numeric($col)) ? mysqli_fetch_row($res) : mysqli_fetch_assoc($res);
if (isset($resrow[$col])){
return $resrow[$col];
}
}
return false;
}I'll include the caller file below...
PHP:
<?php
//check for required info from the query string
if (!$_GET['topic_id']) {
header("Location: topiclist.php");
exit;
}
//connect to server and select database
$conn = mysqli_connect($dbhost, $dbuser, $dbpass)
or die(mysqli_error($conn));
mysqli_select_db($conn,$dbname) or die(mysqli_error($conn));
//verify the topic exists
$verify_topic = "select topic_title from forum_topics where
topic_id = $_GET[topic_id]";
$verify_topic_res = mysqli_query( $conn,$verify_topic)
or die(mysqli_error($conn));
if (mysqli_num_rows($verify_topic_res) < 1) {
//this topic does not exist
$display_block = "<P><em>You have selected an invalid topic.
Please <a href=\"topiclist.php\">try again</a>.</em></p>";
} else {
//get the topic title
$topic_title = stripslashes(mysqli_result($verify_topic_res,0,
'topic_title'));
//gather the posts
$get_posts = "select post_id, post_text, date_format(post_create_time,
'%b %e %Y at %r') as fmt_post_create_time, post_owner from
forum_posts where topic_id = $_GET[topic_id]
order by post_create_time asc";
$get_posts_res = mysqli_query($conn,$get_posts) or die(mysqli_error($conn));
//create the display string
$display_block = "
<P>Showing posts for the <strong>$topic_title</strong> topic:</p>
<table width=100% cellpadding=3 cellspacing=1 border=1>
<tr>
<th>AUTHOR</th>
<th>POST</th>
</tr>";
while ($posts_info = mysqli_fetch_array($get_posts_res)) {
$post_id = $posts_info['post_id'];
$post_text = nl2br(stripslashes($posts_info['post_text']));
$post_create_time = $posts_info['fmt_post_create_time'];
$post_owner = stripslashes($posts_info['post_owner']);
//add to display
$display_block .= "
<tr>
<td width=35% valign=top>$post_owner<br>[$post_create_time]</td>
<td width=65% valign=top>$post_text<br><br>
<a href=\"replytopost.php?post_id=$post_id\"><strong>REPLY TO
POST</strong></a></td>
</tr>";
}
//close up the table
$display_block .= "</table>";
}
function mysqli_result($res,$row=0,$col=0){
$numrows = mysqli_num_rows($res);
if ($numrows && $row <= ($numrows-1) && $row >=0){
mysqli_data_seek($res,$row);
$resrow = (is_numeric($col)) ? mysqli_fetch_row($res) : mysqli_fetch_assoc($res);
if (isset($resrow[$col])){
return $resrow[$col];
}
}
return false;
}
?>
<html>
<head>
<title>Posts in Topic</title>
</head>
<body>
<h1>Posts in Topic</h1>
<?php print $display_block; ?>
</body>
</html>