How to restrict user entered numbers/extracts only numbers

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  I m asking a second time the upfront because I did not answer preivously, so please don't mind if it's a double.
  
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  Hello

  I m asking a second time the upfront because I did not answer preivously, so please don't mind if it's a double.

  It was: I have created a table, as shown in the example.

  I want to validate the user name that you see in my example to restrict the user to enter the same value in the user name field before submitting page.

  for example when the user enters data as u see test in user name in the first row, when it goes to the second row and type same username as test "message will appear or restrict the user who has already typed or in use"...

  http://Apex.Oracle.com/pls/Apex/f?p=45296:1:22797340776918:

  It's all done on typing submit prior to registration. >

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  for the second question is how to limit a voter to vote only 15 candidates and counting of the vote that voters go? When the vote is made with 15, then the popup script appears informed that the elector make themselves with their vote.for this I use box as a method of voting and each checkbox have the id which is the primary key. I appoint the id as 'No' and set it as the primary key. Here is the code for voting:

  <?php
  $servername = "localhost";
  $username = "root";
  $password = "pass";
  $dbname = "ses";
  
  
  // Create connection
  $conn = new mysqli($servername, $username, $password, $dbname);
  // Check connection
  if ($conn->connect_error) {
       die("Connection failed: " . $conn->connect_error);
  }
      
  $sql = "SELECT No, Calon, ID, Jurusan, Image FROM candidates";
  $result = $conn->query($sql);
  
  if(isset($_POST['vote'])) {
      
  //get the ID value from the radio button form field and store in an array.
  $update_vote = $_POST['candidate_id'];
  
  //loop through the array and update the database
  foreach ($update_vote as $value) {
  $vote_sachin = "UPDATE candidates SET Undi=Undi+1 WHERE No=".$value."";
  $run_sachin = mysqli_query($conn, $vote_sachin);
  
  
      }
  
    header("Location:http://localhost/VotingSystem/");
  }
  
  
  ?>
  
  
  <form method="post" id="form1" action="main.php">
  <?php
  if ($result->num_rows > 0) {
  echo "<table border >
  
  
  <tr>
  <th>NO</th>
  <th>Candidate</th>
  <th>INFO</th>
  <th>Vote</th>
  </tr>";
  // output data of each row
  while($row = $result->fetch_assoc()) {
  echo "<tr>
  <td align='center'>" . $row["No"]. "</td>
  <td><img src=" . $row['Image'] . " width=120px height=150px></td>
  <td><br/>" . $row["Calon"]. " <br/>" . $row["ID"]. " <br/>" . $row["Jurusan"]. "<br/></td>
  <td align='center'><input type='checkbox' name='candidate_id[]' value='".$row['No']."'></td>
  </tr>";
  }
      echo "<tr><td></td><td></td><td></td>
      <td><input type='submit' name='vote' value='VOTE'</td>
      </tr>";
  echo "</table>";
  
  
  } else {
  echo "0 results";
  }
  $conn->close();
  
  
  ?>
  
  

  I hope someone can help me with this because I'm still trying to learn this by my own php code...

  Thank you

  # 1, add a Boolean column in the table (VoteSubmitted) and the value initially FALSE to follow if the user has already voted.  Check this field when they connect. If the field is set to TRUE, displays a message and cannot vote again. When they get it vote, update the field from FALSE to TRUE.

  # 2, I would like to do this with javascript to allow them to select all their candidates and submit once. You could start with something like this:

  Cut paste & limit the number of boxes checked script

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