信息没有插入到表中

我的问题是它不向表中插入信息。请阅读代码，并告诉我是什么问题。我也没有从数据库中得到任何错误因为这件事一直在烦我，想多说些细节。

这是HTML:

<div id="middle" class="col">
    <br><br>
    <p class="text-center"><strong> فرم ثبت نام</strong></p>
    <br><p class="text-center"> اجباری<span><strong style="color:red">&nbsp *</strong></p><br>
  <form method="post" style="height:70vh; width:47vw; text-align:center;" action="">
    <table width="75%">
        <tr>
            <td align="right"><span class="error"><?php echo $usernameErr?></span></td>
            <td align="right"><input type="text" name="username" value="<?php echo $username?>"></td>
            <td style="font-size:medium" align="right" height="1.5em">:شناسه<font color="red">&nbsp;*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $passwordErr?></span></td>
            <td align="right"><input type="password" name="password" value="<?php echo $password?>">
            <td style="font-size:medium" align="right" height="1.5em">:رمزعبور<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $password_checkErr?></span></td>
            <td align="right"><input type="password" name="password_check" value="<?php echo $password_check ?>">
            <td style="font-size:medium" align="right" height="1.5em">:تکرار رمز عبور<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $fnameErr?></span></td>
            <td align="right"><input type="text" name="fname" value="<?php echo $fname?>"></td>
            <td style="font-size:medium" align="right">: نام<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $lastnameErr?></span></td>
            <td align="right"><input type="text" name="lname" value="<?php echo $lname?>"></td>
            <td style="font-size:medium" align="right">: نام خانوادگی<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $emailErr?></span></td>
            <td align="right"><input type="email" name="email" value="<?php echo $email?>"></td>
            <td style="font-size:medium" align="right">:پست الکترونیک<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $phone_numberErr?></span></td>
            <td align="right"><input type="text" name="phonenumber" value="<?php echo $phonenumber?>" ></td>
            <td style="font-size:medium" align="right">:تلفن ثابت<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td align="right"><span class="error"><?php echo $cellphone_numberErr?></span></td>
            <td align="right"><input type="text" name="cellphonenumber" value="<?php echo $cellphonenumber?>" ></td>
            <td style="font-size:medium" align="right">:موبایل<font color="red">&nbsp*</font>&emsp;</td>
        </tr>
        <tr>
            <td colspan=3 align=right>
            <table border=0>
                <tr><br>
                <td colspan="2">
                    <input type="text" name="state" value="<?php echo $state?>" >
                </td>
                <td colspan=2 align=right>
                    &emsp;&emsp;:استان<font style="font-size:medium" color="red">&nbsp*&emsp;&emsp;&emsp;&ensp;</font>
                </td>
            </tr>
            </table>
            <table>
            <tr>
                <td><span class="error"><?php echo $addressErr?></span></td>
                <td> <textarea name="address" row+4><?php echo $address?></textarea></td>
                <td style="font-size:medium" colspan=2 align="right">&ensp;:نشانی<font color="red">&nbsp*&emsp;&emsp;&emsp;&ensp;</font></td>
            </tr>
            <tr>
                <td align="right"><span class="error"><?php echo $zipcodeErr?></span></td>
                <td align="right"><input type="text" name="zipcode" value="<?php echo $zipcode?>"></td>
                <td id="address" style="font-size:medium" colspan=2 align="right">&ensp;:کد پستی<font color="red">&nbsp*&emsp;&emsp;&emsp;&ensp;</font></td>
            </tr>
        </table>
        <br><span class="text-center"><input type="submit" name="submit" value="ثبت" style="height:3vh"></span>&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;&emsp;
  </form>  

这是php,mysql:

    <?php
    // define variables and set to empty values
    $zipcode = $username = $password = $password_check = $lname = $state
     = $fname = $email = $cellphonenumber = $address = $phonenumber ="";

    $zipcodeErr = $usernameErr = $passwordErr = $password_checkErr = $lastnameErr = $stateErr
     = $fnameErr = $emailErr = $cellphone_numberErr = $addressErr = $phone_numberErr = "";

    $anyerror=0;
    // Create connection
    $conn = new mysqli('localhost', 'root', '', 'mysql');
// Check connection
    if ($conn->connect_error)
        die("Connection failed: " . $conn->connect_error);
    $sql = "CREATE TABLE IF NOT EXISTS MyUsers6 (
            id INT(6) UNSIGNED AUTO_INCREMENT,
            username VARCHAR(30) NOT NULL,
            password VARCHAR(30) NOT NULL,
            fname VARCHAR(30) NOT NULL,
            lname VARCHAR(30) NOT NULL,
            phonenumber VARCHAR(30) NOT NULL,
            cellphonenumber VARCHAR(30) NOT NULL,
            email VARCHAR(50) NOT NULL,
            state VARCHAR(50) NOT NULL,
            address VARCHAR(50) NOT NULL,
            zipcode VARCHAR(50) NOT NULL,
            reg_date TIMESTAMP,
            primary key (id)
    )";
    if ($conn->query($sql) === FALSE)
        echo "Error creating table: " . $conn->error;

    if ($_SERVER["REQUEST_METHOD"] == "POST") {

    if (empty($_POST["username"])){
        $usernameErr ="لطفا شناسه خود را وارد نمایید";
        $anyerror=1;}
    else
        $username = test_input($_POST["username"]);
    if (empty($_POST["state"])){
        $stateErr ="لطفا شناسه خود را وارد نمایید";
        $anyerror=1;}
    else
        $state = test_input($_POST["state"]);

    if (empty($_POST["password"])){
        $passwordErr = "لطفا رمزعبور خود را وارد نمایید";
        $anyerror=1;}
    else
        $password = test_input($_POST["password"]);

    if (empty($_POST["password_check"])){
        $password_checkErr = "لطفا رمزعبور را دوباره وارد کنید";
        $anyerror=1;}
    if(strcmp($password,$password_check) ==0 && isset($_POST["password_check"])){
        $password_checkErr = " رمز عبور ها یکسان نیستند";
        $anyerror=1;}
    else
        $password_check = test_input($_POST["password_check"]);

    if (empty($_POST["fname"])) {
        $fnameErr = "لطفا نام خود را وارد نمایید";
        $anyerror=1;}
    else 
        $fname = test_input($_POST["fname"]);

    if (empty($_POST["lname"])) {
        $lastnameErr = "لطفا نام خانوادگی خود را وارد نمایید";
        $anyerror=1;}
        else 
        $lname = test_input($_POST["lname"]);

    if (empty($_POST["email"])) {
        $emailErr = "لطفا ایمیل خود را وارد نمایید";
        $anyerror=1;}
    elseif (filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $emailErr = "فرمت ایمیل غیرمجاز است";
        $anyerror=1;
    }
    else 
        $email = test_input($_POST["email"]);

    if (empty($_POST["phonenumber"])) {
        $phone_numberErr = "لطفا شماره تلفن خود را وارد نمایید";
        $anyerror=1;}
    else 
        $phonenumber = test_input($_POST["phonenumber"]);

    if (empty($_POST["address"])) {
        $addressErr = "لطفا نشانی خود را وارد نمایید";
        $anyerror=1;}
    else 
        $address = test_input($_POST["address"]);

    if (empty($_POST["cellphonenumber"])) {
        $cellphone_numberErr = "لطفا شماره موبایل خود را وارد نمایید";
        $anyerror=1;}
    else 
        $cellphonenumber = test_input($_POST["cellphonenumber"]);

    if (empty($_POST["zipcode"])) {
        $zipcodeErr = "لطفا شماره موبایل خود را وارد نمایید";
        $anyerror=1;}
    else 
        $zipcode = test_input($_POST["zipcode"]);

    if ( $anyerror = 0 )
            $sql = "INSERT INTO MyUsers6 VALUES ('$username' ,'$password', '$fname', '$lname', '$phonenumber', '$cellphonenumber', '$email', '$state', '$address', '$zipcode')";

        if ($conn->query($sql) === FALSE) 
            echo "Error: " . $sql . "<br>" . $conn->error;
        else
            echo "ssssssss";
    }
    function test_input($data) {
        $data = trim($data);
        $data = stripslashes($data);
        $data = htmlspecialchars($data);
        return $data;
    }

    ?>