Post message php, error, please suggest a change

Question

This is my code of my status.php file but on posting status it is showing only one thing i.e. type_unknown but I am not sure why it is not functioning properly. and type_unknown is also a command in this coding please go through this command and after that suggest any change you want to.

 <?php
    include_once("../php_includes/check_login_status.php");
    if($user_ok != true || $log_username == "") {
        exit();
    }
    ?><?php
    if (isset($_POST['action']) && $_POST['action'] == "status_post"){
        // Make sure post data is not empty
        if(strlen($_POST['data']) < 1){
            mysqli_close($db_conx);
            echo "data_empty";
            exit();
        }
        // Make sure type is either a or c
        if($_POST['type'] != "a" || $_POST['type'] != "c"){
            mysqli_close($db_conx);
            echo "type_unknown";
            exit();
        }
        // Clean all of the $POST vars that will interact with the database
        $type = preg_replace('#[^a-z]#', '', $_POST['type']);
        $account_name = preg_replace('#[^a-z0-9]#i', '', $_POST['user']);
        $data = htmlentities($_POST['data']);
        $data = mysqli_real_escape_string($db_conx, $data);
        // Make sure account name exists (the profile being posted on)
        $sql = "SELECT COUNT(id) FROM users WHERE username='$account_name' AND activated='1' LIMIT 1";
        $query = mysqli_query($db_conx, $sql);
        $row = mysqli_fetch_row($query);
        if($row[0] < 1){
            mysqli_close($db_conx);
            echo "$account_no_exist";
            exit();
        }
        // Insert the status post into the database now
        $sql = "INSERT INTO status(account_name, author, type, data, postdate) 
                VALUES('$account_name','$log_username','$type','$data',now())";
        $query = mysqli_query($db_conx, $sql);
        $id = mysqli_insert_id($db_conx);
        mysqli_query($db_conx, "UPDATE status SET osid='$id' WHERE id='$id' LIMIT 1");
        // Count posts of type "a" for the person posting and evaluate the count
        $sql = "SELECT COUNT(id) FROM status WHERE author='$log_username' AND type='a'";
        $query = mysqli_query($db_conx, $sql); 
        $row = mysqli_fetch_row($query);
        if ($row[0] > 9) { // If they have 10 or more posts of type a
            // Delete their oldest post if you want a system that auto flushes the oldest
            // (you can auto flush for post types c and b if you wish to also)
            $sql = "SELECT id FROM status WHERE author='$log_username' AND type='a' ORDER BY id ASC LIMIT 1";
            $query = mysqli_query($db_conx, $sql); 
            $row = mysqli_fetch_row($query);
            $oldest = $row[0];
            mysqli_query($db_conx, "DELETE FROM status WHERE osid='$oldest'");
        }
        // Insert notifications to all friends of the post author
        $friends = array();
        $query = mysqli_query($db_conx, "SELECT user1 FROM friends WHERE user2='$log_username' AND accepted='1'");
        while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) { array_push($friends, $row["user1"]); }
        $query = mysqli_query($db_conx, "SELECT user2 FROM friends WHERE user1='$log_username' AND accepted='1'");
        while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) { array_push($friends, $row["user2"]); }
        for($i = 0; $i < count($friends); $i++){
            $friend = $friends[$i];
            $app = "Status Post";
            $note = $log_username.' posted on: <br /><a href="user.php?u='.$account_name.'#status_'.$id.'">'.$account_name.'&#39;s Profile</a>';
            mysqli_query($db_conx, "INSERT INTO notifications(username, initiator, app, note, date_time) VALUES('$friend','$log_username','$app','$note',now())");          
        }
        mysqli_close($db_conx);
        echo "post_ok|$id";
        exit();
    }
    ?><?php 
    //action=status_reply&osid="+osid+"&user="+user+"&data="+data
    if (isset($_POST['action']) && $_POST['action'] == "status_reply"){
        // Make sure data is not empty
        if(strlen($_POST['data']) < 1){
            mysqli_close($db_conx);
            echo "data_empty";
            exit();
        }
        // Clean the posted variables
        $osid = preg_replace('#[^0-9]#', '', $_POST['sid']);
        $account_name = preg_replace('#[^a-z0-9]#i', '', $_POST['user']);
        $data = htmlentities($_POST['data']);
        $data = mysqli_real_escape_string($db_conx, $data);
        // Make sure account name exists (the profile being posted on)
        $sql = "SELECT COUNT(id) FROM users WHERE username='$account_name' AND activated='1' LIMIT 1";
        $query = mysqli_query($db_conx, $sql);
        $row = mysqli_fetch_row($query);
        if($row[0] < 1){
            mysqli_close($db_conx);
            echo "$account_no_exist";
            exit();
        }
        // Insert the status reply post into the database now
        $sql = "INSERT INTO status(osid, account_name, author, type, data, postdate)
                VALUES('$osid','$account_name','$log_username','b','$data',now())";
        $query = mysqli_query($db_conx, $sql);
        $id = mysqli_insert_id($db_conx);
        // Insert notifications for everybody in the conversation except this author
        $sql = "SELECT author FROM status WHERE osid='$osid' AND author!='$log_username' GROUP BY author";
        $query = mysqli_query($db_conx, $sql);
        while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
            $participant = $row["author"];
            $app = "Status Reply";
            $note = $log_username.' commented here:<br /><a href="user.php?u='.$account_name.'#status_'.$osid.'">Click here to view the conversation</a>';
            mysqli_query($db_conx, "INSERT INTO notifications(username, initiator, app, note, date_time) 
                         VALUES('$participant','$log_username','$app','$note',now())");
        }
        mysqli_close($db_conx);
        echo "reply_ok|$id";
        exit();
    }
    ?><?php 
    if (isset($_POST['action']) && $_POST['action'] == "delete_status"){
        if(!isset($_POST['statusid']) || $_POST['statusid'] == ""){
            mysqli_close($db_conx);
            echo "status id is missing";
            exit();
        }
        $statusid = preg_replace('#[^0-9]#', '', $_POST['statusid']);
        // Check to make sure this logged in user actually owns that comment
        $query = mysqli_query($db_conx, "SELECT account_name, author FROM status WHERE id='$statusid' LIMIT 1");
        while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
            $account_name = $row["account_name"]; 
            $author = $row["author"];
        }
        if ($author == $log_username || $account_name == $log_username) {
            mysqli_query($db_conx, "DELETE FROM status WHERE osid='$statusid'");
            mysqli_close($db_conx);
            echo "delete_ok";
            exit();
        }
    }
    ?><?php 
    if (isset($_POST['action']) && $_POST['action'] == "delete_reply"){
        if(!isset($_POST['replyid']) || $_POST['replyid'] == ""){
            mysqli_close($db_conx);
            exit();
        }
        $replyid = preg_replace('#[^0-9]#', '', $_POST['replyid']);
        // Check to make sure the person deleting this reply is either the account owner or the person who wrote it
        $query = mysqli_query($db_conx, "SELECT osid, account_name, author FROM status WHERE id='$replyid' LIMIT 1");
        while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
            $osid = $row["osid"];
            $account_name = $row["account_name"];
            $author = $row["author"];
        }
        if ($author == $log_username || $account_name == $log_username) {
            mysqli_query($db_conx, "DELETE FROM status WHERE id='$replyid'");
            mysqli_close($db_conx);
            echo "delete_ok";
            exit();
        }
    }
    ?>



/*new one demanded*/
<?php
$status_ui = "";
$statuslist = "";
if($isOwner == "yes"){
    $status_ui = '<textarea id="statustext" onkeyup="statusMax(this,250)" placeholder="What&#39;s new with you '.$u.'?"></textarea>';
    $status_ui .= '<button id="statusBtn" onclick="postToStatus('status_post','a',''.$u.'','statustext')">Post</button>';
} else if($isFriend == true && $log_username != $u){
    $status_ui = '<textarea id="statustext" onkeyup="statusMax(this,250)" placeholder="Hi '.$log_username.', say something to '.$u.'"></textarea>';
    $status_ui .= '<button id="statusBtn" onclick="postToStatus('status_post','c',''.$u.'','statustext')">Post</button>';
}
?><?php 
$sql = "SELECT * FROM status WHERE account_name='$u' AND type='a' OR account_name='$u' AND type='c' ORDER BY postdate DESC LIMIT 20";
$query = mysqli_query($db_conx, $sql);
$statusnumrows = mysqli_num_rows($query);
while ($row = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
    $statusid = $row["id"];
    $account_name = $row["account_name"];
    $author = $row["author"];
    $postdate = $row["postdate"];
    $data = $row["data"];
    $data = nl2br($data);
    $data = str_replace("&amp;","&",$data);
    $data = stripslashes($data);
    $statusDeleteButton = '';
    if($author == $log_username || $account_name == $log_username ){
        $statusDeleteButton = '<span id="sdb_'.$statusid.'"><a href="#" onclick="return false;" onmousedown="deleteStatus(''.$statusid.'','status_'.$statusid.'');" title="DELETE THIS STATUS AND ITS REPLIES">delete status</a></span> &nbsp; &nbsp;';
    }
    // GATHER UP ANY STATUS REPLIES
    $status_replies = "";
    $query_replies = mysqli_query($db_conx, "SELECT * FROM status WHERE osid='$statusid' AND type='b' ORDER BY postdate ASC");
    $replynumrows = mysqli_num_rows($query_replies);
    if($replynumrows > 0){
        while ($row2 = mysqli_fetch_array($query_replies, MYSQLI_ASSOC)) {
            $statusreplyid = $row2["id"];
            $replyauthor = $row2["author"];
            $replydata = $row2["data"];
            $replydata = nl2br($replydata);
            $replypostdate = $row2["postdate"];
            $replydata = str_replace("&amp;","&",$replydata);
            $replydata = stripslashes($replydata);
            $replyDeleteButton = '';
            if($replyauthor == $log_username || $account_name == $log_username ){
                $replyDeleteButton = '<span id="srdb_'.$statusreplyid.'"><a href="#" onclick="return false;" onmousedown="deleteReply(''.$statusreplyid.'','reply_'.$statusreplyid.'');" title="DELETE THIS COMMENT">remove</a></span>';
            }
            $status_replies .= '<div id="reply_'.$statusreplyid.'" class="reply_boxes"><div><b>Reply by <a href="user.php?u='.$replyauthor.'">'.$replyauthor.'</a> '.$replypostdate.':</b> '.$replyDeleteButton.'<br />'.$replydata.'</div></div>';
        }
    }
    $statuslist .= '<div id="status_'.$statusid.'" class="status_boxes"><div><b>Posted by <a href="user.php?u='.$author.'">'.$author.'</a> '.$postdate.':</b> '.$statusDeleteButton.' <br />'.$data.'</div>'.$status_replies.'</div>';
    if($isFriend == true || $log_username == $u){
        $statuslist .= '<textarea id="replytext_'.$statusid.'" class="replytext" onkeyup="statusMax(this,250)" placeholder="write a comment here"></textarea><button id="replyBtn_'.$statusid.'" onclick="replyToStatus('.$statusid.',''.$u.'','replytext_'.$status

Answer 1

If the problem is appearing in this line:

 if($_POST['type'] != "a" || $_POST['type'] != "c"){

Then, it means that the you do not have an input form with the name type inside it, or the post data may not be transferred at all. So, check your HTML form if it has input called type