Syntaxe requete certainement erronée

<?php

    //Add a file to connect to the database
    require_once("../dbconnect.php");

    //We declare a cell to add errors that may occur during form processing.
    $_SESSION["error_messages"] = '';

    //Declare a cell to add successful messages
    $_SESSION["success_messages"] = '';


    /*
        Check if the form has been submitted, that is, if the Enter button has been clicked. If yes, then go ahead, if not, then we will display to the user an error message, that he went to this page directly.


*/    if(isset($_POST["submitButtonName"]) && !empty($_POST["submitButtonName"])){        //(2) Place to handle postal address            if(isset($_POST["email"])){                //We cut the spaces from the beginning and from the end of the line                $email = trim($_POST["email"]);                if(!empty($email)){                    $email = htmlspecialchars($email, ENT_QUOTES);                    //Check the format of the received email address using a regular expression.                    $reg_email = "/^[a-z0-9][a-z0-9\._-]*[a-z0-9]*@([a-z0-9]+([a-z0-9-]*[a-z0-9]+)*\.)+[a-z]+/i";                    //If the format of the received postal address does not match the regular expression                    if( !preg_match($reg_email, $email)){                        // Save the error message to the session.                         $_SESSION["error_messages"] .= "<p class='mesage_error' >Incorrect email</p>";                                                //We return the user to the login page                        header("HTTP/1.1 301 Moved Permanently");                        header("Location: ".$address_site."admin/admin_auth.php");                        //Removable script                        exit();                    }                }            }else{                // Save the error message to the session.                 $_SESSION["error_messages"] .= "<p class='mesage_error' >Input Email</p>";                                //We return the user to the login page                header("HTTP/1.1 301 Moved Permanently");                header("Location: ".$address_site."admin/admin_auth.php");                //Removable script                exit();            }             //(3) Password processing location           
 if(isset($_POST["password"])){ 
               //We cut the spaces from the beginning and from the end of the line               
 $password = trim($_POST["password"]);               
 if(!empty($password)){                    
$password = htmlspecialchars($password, ENT_QUOTES);                    //Encrypt password                    $password = md5($password."top_secret");               
 }else{              
      // Save the error message to the session.                    
$_SESSION["error_messages"] .= "<p class='mesage_error' ><b>Oops! Veuillez taper votre password..</b></p>";                                       
 //We return the user to the registration page                    
header("HTTP/1.1 301 Moved Permanently");                    
header("Location: ".$address_site."admin/admin_auth.php");                   
 //Removable script                    exit();               
 }                           
 }else{ 
               // Save the error message to the session.                 $_SESSION["error_messages"] .= "<p class='mesage_error' >Missing password field !</p>";                                //We return the user to the registration page                header("HTTP/1.1 301 Moved Permanently");                header("Location: ".$address_site."admin/admin_auth.php");                //Removable script                exit();            }                //Request to the database on the user's selection.            
$result_query_select = $mysqli->query("SELECT * FROM `admin` WHERE email = '".$email."' AND password = '".$password."'");            if(!$result_query_select){                // Save the error message to the session.                 $_SESSION["error_messages"] .= "<p class='mesage_error' >Request failed to fetch user from DB</p>";                                //We return the user to the registration page                //Removable script                exit();            }else{                //We check if there is no user in the database with such data, then we display an error message                if($result_query_select->num_rows == 1){                                                              //place to add data to the session                            // If the entered data coincides with the data from the database, then we save the login and password into an array of sessions.                           
 $_SESSION['email'] = $email;                            $_SESSION['password'] = $password;                            //We return the user to the main page                            header("HTTP/1.1 301 Moved Permanently");                            
header("Location: ".$address_site."admin/");                         
}else{                                        // Save the error message to the session.                     $_SESSION["error_messages"] .= "<p class='mesage_error' ><b>Incorrect username and / or password</b></p>";                                        //We return the user to the login page                    header("HTTP/1.1 301 Moved Permanently");                    header("Location: ".$address_site."admin/admin_auth.php");                    //Removable script                    exit();                }            }       
 }    else{     
   exit("<p><strong>Oops!</strong> The requested page is only accessible when the user is logged on. Please, visit the <a href='index.php'> Main page </a> and log in.</p>");    }

<?php
    //Connecting caps
    include_once("header_q.php");
?>

<script type="text/javascript">
    $(document).ready(function(){
        "use strict";
        //================ Check email ==================

        //regular expression for checking email
        var pattern = /^[a-z0-9][a-z0-9\._-]*[a-z0-9]*@([a-z0-9]+([a-z0-9-]*[a-z0-9]+)*\.)+[a-z]+/i;
        var mail = $('input[name=email]');
        
        mail.blur(function(){
            if(mail.val() != ''){

                // Check if the email matches the regular expression.
                if(mail.val().search(pattern) == 0){
                    // We remove the error message
                    $('#valid_email_message').text('');

                    //Activate the submit button
                    $('input[type=submit]').attr('disabled', false);
                }else{
                    //We display an error message
                    $('#valid_email_message').text('Invalid Email');

                    // Desactivate the submit button
                    $('input[type=submit]').attr('disabled', true);
                }
            }else{
                $('#valid_email_message').text('Enter your email');
            }
        });

        //================ Password length check ==================
        var password = $('input[name=password]');
        
        password.blur(function(){
            if(password.val() != ''){

                //If the length of the entered password is less than six characters, then we display an error message.
                if(password.val().length < 6){
                    //We display an error message
                    $('#valid_password_message').text('The minimum password length is 6 characters.');

                    // Desactivate the submit button
                    $('input[type=submit]').attr('disabled', true);
                    
                }else{
                    // We remove the error message
                    $('#valid_password_message').text('');

                    //Activate the submit button
                    $('input[type=submit]').attr('disabled', false);
                }
            }else{
                $('#valid_password_message').text('Enter password');
            }
        });
    });
</script>

<!-- Block to display messages -->
<div class="block_for_messages">
    <?php

        if(isset($_SESSION["error_messages"]) && !empty($_SESSION["error_messages"])){
            echo $_SESSION["error_messages"];

             //Destroy the error_messages cell so that error messages do not reappear when the page is updated.
            unset($_SESSION["error_messages"]);
        }

        if(isset($_SESSION["success_messages"]) && !empty($_SESSION["success_messages"])){
            echo $_SESSION["success_messages"];
            
            //Destroy the success_messages cell so that messages do not reappear when the page is updated.
            unset($_SESSION["success_messages"]);
        }
    ?>
</div>

<?php
    //We check if the user is not authorized, then we display the authorization form, 
    //otherwise display a message stating that it is already authorized
    if(!isset($_SESSION["email"]) && !isset($_SESSION["password"])){
?>

<div id="form_auth">
   <p> <h1>Connecting to the interface</h1></p>
    
    <form action="auth.php" method="post">
        <table border="0" cellpadding="2" cellspacing="2" width="400">
            <tr>
                <td>
                    <fieldset>
                        <legend> Admin login </a> </legend><br>
                        <table border="0" cellpadding="0" cellspacing="2" whidt="600">
                            <tbody>
                            <tr>
                                <td valign="top" width="241">
                                    <div align="left">
                                        Username:</div>
                                </td>
                                <td width="342"><input type="text" name="email" placeholder="your email address.." size="24"></td>
                            </tr>
                            <tr>
                                <td width="241">
                                    <div align="left">
                                        Password:</div>
                                </td>
                                <td width="342"><input type="password" name="password" size="24"></td>
                            </tr>
                            <tr>
                                <td valign="top" width="241">
                                    <p></p>
                                    <p><input type="submit" name="submitButtonName" value="Log in"></p>
                                    <p></p>
                                </td>
                            </tr>
                            </tbody>
                        </table>
                    </fieldset>
                </td>
            </tr>
        </table>
    </form>

</div>
<?php 
    }else{
?>
    <div id="authorized">
        <h2>You are already logged in.</h2>
    </div>
        
<?php
    }
?>

<?php 
    
    //Connecting to the footer
    require_once("footer.php");
?>