php - how to create prepared mysqli statements and add password_hash -


i tried migrating way errors came out went crazy instant.

https://ideone.com/mih7ip

how can create mysqli prepared statements , add password_hash create secure access system.

to system have added show captcha first failed attempt registered in database.

this not enough improve safety.

my code:

<?php   session_start();   $message="";   $captcha = true;    $con =  @new mysqli('localhost', 'root', '', 'system');    if(count($_post)>0 && isset($_post["vcode"]) && $_post["vcode"]!=$_session["vcode"]) {     $captcha = false;     $message = "written characters not match verification word. try again.";   }    $ip = $_server['remote_addr'];    //we block ip 1 day   $result = mysqli_query($con,"select * failed_login ip='$ip' , date between date_sub( now() , interval 1 day ) , now()");   $row  = mysqli_fetch_assoc($result);   //we data buy attempts , reset attempts last date.   $failed_login_attempt = mysqli_real_escape_string($con,$row['attempts']);    mysqli_free_result($result);    if(count($_post)>0 && $captcha == true) {     $username = mysqli_real_escape_string($con, $_post["username"]);     $password = mysqli_real_escape_string($con, $_post["password"]);     $username = htmlentities($username);     $password = htmlentities($password);     $save_passw = sha1($password);     $sql = "select * users username='$username' , password='$save_passw' , active='1' ";     $query = mysqli_query($con, $sql);      $rowu  = mysqli_fetch_assoc($query);     $usernamadb = mysqli_real_escape_string($con, $rowu["username"]);     $passworddb = mysqli_real_escape_string($con, $rowu["password"]);      if($failed_login_attempt <1) {             //if first failed attempt, include first record in bd             $con->query("insert failed_login (ip,attempts,date) values ('$ip', 1, now())");             } else {                 if($failed_login_attempt <2){                 //in case of being in db, extracted value , added +1                 $contador = $row['attempts'] + 1;                 $con->query("update failed_login set attempts='$contador', date=now() ip = '$ip'");             }         }           if (empty($_post) === false) {             $username = $_post['username']; $password = $_post['password'];             if (empty($username) === true || empty($password) === true) {                 $message = "you need enter username , password";              } elseif ($username != $usernamadb) {                 $message = "the 'user' entered not match. ";              } elseif ($save_passw != $passworddb) {                 $message = "your 'password' entered not match. ";              } elseif($save_passw == $passworddb && $username == $usernamadb) {                 $_session["id_user"] = 1;                 //$con->query("delete login_attempts ip = '$ip'");              }             }         }         if(isset($_session["id_user"])) {             header("location:http://localhost/index.php");         } ?> <?php include 'themes/template/header.php'; ?> <div id="login" class="center">   <div class="container">     <div class="access">         <h2>enter here.</h2>         <h1><?php if($message!="") { echo $message; } ?></h1>         <form name="frmuser" action="#" method="post">             <input class="form-one" type="text" name="username" placeholder="username">             <input class="form-one" type="password" name="password" placeholder="password">             <?php if (isset($failed_login_attempt) && $failed_login_attempt >= 1) { ?>             <br><img src="image.php" id="phoca-captcha"/>             <input name="vcode" type="text" placeholder="codigo captcha">             <?php } ?>             <ul class="recovery">               <li>                   <input class="checkbox-one" type="checkbox" id="brand1" value="">                   <label for="brand1"><span></span>recordarme</label>                   <a href="#" class="transitioneffects">¿olvidó su contraseña?</a>                 </li>               </ul>               <div class="wrapper">                 <input class="btnaccess" type="submit" id="button-login" value="log in">                 <p class="matopforty letter-spacing-one">register new account<span>→</span> <a class="registeraa" href="#"> ¡free registration!</a></p>                 <div class="clear"></div>               </div>         </form>     </div>   </div> </div>


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