无法将行插入数据库

Question

不知怎的，我无法使用php将内容写入我的数据库。我使用代码编写前一个并且它工作但不知何故它不与表thread_db。我可以连接到表（我通过回显$ num_rows [计算表行 - ＆gt;我没有任何东西]来测试它）。请帮我！这是代码：

<?php
include_once 'dbconnection.php';
include 'auth.php';

$id=($_SESSION['logedin']);
            $abfrage = "SELECT * FROM login WHERE id = '$id'";
            $ergebnis = mysql_query($abfrage);
            while($row = mysql_fetch_object($ergebnis))
            {           
                $from = ($row->username);
                $title = $_POST["thread_title"]; 
                $content = $_POST["thread_content"];
                $result12 = mysql_query("SELECT * FROM thread_db");
                $num_rows = mysql_num_rows($result12); //counting all rows in table thread_db
                $num_rows = (int)$num_rows; //converting result into int
                $fileid = $num_rows + 1;    // make the result +1

                if($from == "" OR $title == "" OR $content == "") 
                { 
                    echo "Input error. Please fill in all fields. <a href=\"create.php\">go back</a>"; 
                    exit; 
                }
                else{

                $insertvalues = "INSERT INTO thread_db (from, title, content) VALUES ('$from', '$title', '$content')";  //doesn't seem to work

                $successfull = mysql_query($insertvalues); 

                if($successfull = true) 
                { 
                    //set some basic html content 
                    $ch1 = file_get_contents('./create/create_header1.txt');
                    $ch2 = file_get_contents('./create/create_header2.txt');
                    $c1 = file_get_contents('./create/create_content1.txt');
                    $c2 = file_get_contents('./create/create_content2.txt');
                    $c3 = file_get_contents('./create/create_content3.txt');
                    $c4 = file_get_contents('./create/create_content4.txt');
                    $sHTML_Header = ($ch1.$title.$ch2);
                    $sHTML_Content = ($c1.$title.$c2.$content.$c3.$row->username.$c4);
                    $sHTML_Footer =  file_get_contents('./create/create_footer.txt');

                    $filename = $fileid.".php"; // name the file -> id + 1 + ending *.php

                    // creation of the file as writeable and readable file 
                    IF (!$handle = FOPEN($filename, 'x+')) { 
                            ECHO "Cannot open file (".$filename.")"; 
                            EXIT; 
                    } 

                    // Write $somecontent to created file. 
                    IF (FWRITE($handle, $sHTML_Header) === FALSE) { 
                        ECHO "Cannot write to file (".$filename.")"; 
                        EXIT; 
                    }ELSE{ 
                        //file is ok so write the other elements to it 
                        FWRITE($handle, $sHTML_Content); 
                        FWRITE($handle, $sHTML_Footer); 
                    } 

                    FCLOSE($handle); 

                    //if created you can edit it now // file will be renamed and will get its own dir
                    if (file_exists($filename)){
                    $old = $filename;
                    mkdir("./projects/".$fileid, 0700);
                    mkdir("./projects/".$fileid."/images", 0700);
                    $new = 'projects'. DIRECTORY_SEPARATOR . $fileid . DIRECTORY_SEPARATOR .'index.php';
                    rename($old , $new);
                    echo "Your page was successfully created, go and <a href='".$new."'>edit it now.</a>";
                    }
                    else{
                        echo "<br>There was an error creating the thread.";
                    }
                }
                else{
                    echo "<br>There was an error creating the thread.";
                }

                }
            }
?>