Home/ Questions/Q 8321013
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-08T22:52:17+00:00

I’m trying to get a drop-down box to populate from data within a database,

  • 0

I’m trying to get a drop-down box to populate from data within a database, but it does not seem to be working. It passes an error saying that there is no data in the database for it to read but there is. Below is the script I used to make it work. 

    <?php
@ini_set('display_errors', 'on');
 echo "<h1>Register</h1>";
if ($_SERVER['REQUEST_METHOD'] == 'POST'){

$errors = array();
if (empty($_POST['firstname'])){
$errors[] = 'Your forgot to enter your first name.';
}else{
  $firstname = trim($_POST['firstname']);
  }
if (empty($_POST['lastname'])){
$errors[] = 'Your forgot to enter your last name.';
}else{
  $lastname = trim($_POST['lastname']);
}
if (empty($_POST['username'])){
$errors[] = 'Your forgot to enter your  username.';
}else{
  $username = trim($_POST['username']);
}
if (!empty($_POST['password1'])) {
if ($_POST['password1'] != $_POST ['password2']) {
  $errors[] = 'Your password did not match the confirmed password!';
 }else{
   $password = trim($_POST['password1']);
  }
} else {
  $errors[] = 'You forgot to enter your password!';
}
if (empty($_POST['birthdate'])){
$errors[] = 'Your forgot to enter your  birthdate.';
}else{
  $birthdate = trim($_POST['birthdate']);
}
if (empty($_POST['gamespyid'])){
$errors[] = 'Your forgot to enter your  gamespy id.';
}else{
  $gamespyid = trim($_POST['gamespyid']);
}
  if (empty($errors)) {
     if (is_file('admin/mysqli_connect.php')) { echo '<p>The connection file is there.</p>';require('admin/mysqli_connect.php'); }

else {
  echo '<p>The connection file is not there</p>';
  }
     $q="INSERT INTO Users (firstname, lastname, username, password1, birthdate, gamespyid, base) VALUES ('$firstname', '$lastname', '$username', md5('$password1'), '$birthdate', '$gamespyid', '$base')";
$r = mysql_query($dbc, $q);
if ($r){
 echo'<p>You are now registered</p>';
}else{
  echo'<p>You have not been registered</p>';
                                            }
  } else {
    echo 'Error<br> <p>The following errors have occured:<br/>';
    foreach ($error as $msg) {
      echo " - $msg<br/>\n";
    }
    echo '</p><p>Please try again.</p><p><br/></p>';
  }   //if no errors

 }     //submit

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
<head>
  <title></title>
</head>

<body>
  <form action="http://www.virtual-aviation.org/gatewayaviation/index.php?p=register" method='POST'>
    <table summary="REgform">
      <tr>
        <td>First Name:</td>

        <td><input type='text' name='firstname' value='<?php echo $firstname; ?>'></td>
      </tr>

      <tr>
        <td>Last Name:</td>

        <td><input type='text' name='lastname'value='<?php echo $lastname; ?>'></td>
      </tr>

      <tr>
        <td>Username:</td>

        <td><input type='text' name='username'value='<?php echo $username; ?>'></td>
      </tr>

      <tr>
        <td>Password:</td>

        <td><input type='password' name='password1'></td>
      </tr>

      <tr>
        <td>Repeat Password:</td>

        <td><input type='password' name='password2'></td>
      </tr>

      <tr>
        <td>Birthdate:</td>

        <td><input type='text  ' name='birthdate'value='<?php echo $birthdate; ?>'></td>
      </tr>

      <tr>
        <td>Gamespy Id:</td>

        <td><input type='text' name='gamespyid'value='<?php echo $gamespyid; ?>'></td>
      </tr>
       <td>Base:</td>
      <tr>
       <td><select name="base" size="1">
          <option>
            Select One
          </option>
         <?php
         $qf = "SELECT  airport_id, CONCAT_WS(' ', airport_name, airport_code) FROM airports ORDER BY airport_code ASC";
         $rf = mysqli_query ($dbc, $qf);

         if (mysqli_num_rows($rf) > 0) {
         while ($row = mysql_fetch_array ($rf, MYSQLI_NUM)) {
         echo "<option value=\"$row[0]\"";
         if (isset($_POST['existing']) && ($_POST['existing'] == $row[0]) ) echo 'selected="selected"'; echo ">$row[1]</option>\n";
         }
   } else {
   echo '<option>Please a new airport first.</option>';
    }
    //mysqli_close($dbc);

         ?>
        </select></td>
      </tr>
    </table>
   <input type='submit' name='submit' value='Register'/>
  </form>
  <?php
  echo '<p>debugger<p>' . $rf ;
  ?>
</body>
</html>

Here are some errors I get when I view the source code; the errors appear where the option box content should be.

Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /home5/virtua15/public_html/gatewayaviation/pages/register.inc.php on line 182

Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, null given in /home5/virtua15/public_html/gatewayaviation/pages/register.inc.php on line 184

Please a new airport first.
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Either use mysql_* or mysqli_* functions, but you can’t use both. I’d prefer you choose the latter and learn about prepared statements: http://php.net/manual/en/mysqli.quickstart.prepared-statements.php

    The problem is your $dbc variable is most likely a mysql resource or null, not a mysqli resource so when you pass it to the mysqli_* functions it fails. There are ways to check and ensure you have a valid resource:

    $mysqli = new mysqli("example.com", "user", "password", "database");
if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
}

    To solve your problem, you need to restructure your code to use only mysqli and make sure $dbc is a valid mysqli resource.

    • 0