php - Comparing a value inside database with input value -

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my if statement doesn't recognize textbox name ("ans"). should change? , should put it? want know if if statement correct; want compare value inside database input value ("ans"). in advance. 

<?php     $con = mysql_connect("localhost", "root", "avtt123");     mysql_select_db("arvintarrega",$con);      $sql = "select * identification";     $mydata = mysql_query($sql,$con);         echo '<form method = "post">';  while($iden = mysql_fetch_array($mydata)) {        echo '<center>' . $iden['question_number'] . '. ' . $iden['statement'] . ' <input type = "text" name = "ans"></input></center></br>';      if($iden['correct_answer'] == $_request['ans'])        {         echo "correct";        }     else        {         echo "wrong";        }  }        echo '</form>'; ?> <form method = "post"> <input type = "submit" name = "submit" value = "submit" class="btn btn-warning"> </form>

here's database

give following try worked me, , i'm using mysqli_ connection , query, change xxx own credentials.

<?php $db_host = 'xxx'; $db_user = 'xxx'; $db_pass = 'xxx'; $db_name = 'xxx';  $link = new mysqli($db_host, $db_user, $db_pass, $db_name); if($link->connect_errno > 0) {   die('connection failed [' . $link->connect_error . ']'); }  $sql = "select * identification limit 1";  $mydata = mysqli_query($link, $sql);         echo '<form method = "post">';  while($iden = mysqli_fetch_array($mydata)) {     echo '<center>' . $iden['question_number'] . '. ' . $iden['statement'] . ' <input type = "text" name = "ans"></center><br/>';   if(isset($_post['submit']))  {      if(isset($_post['ans']) && $iden['correct_answer'] == $_post['ans']){        echo "correct<br><br>";        }     else        {         echo "wrong<br><br>";        }        } // if(isset($_post['submit'])) end brace  } // while loop end brace  echo '<input type = "submit" name = "submit" value = "submit" class="btn btn-warning">';       echo '</form>'; ?>

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