PHP - What's Wrong With This Code?

<?php
global $con;
$name = $_GET['name'];
$email = $_GET['email'];
if((!empty($name)) && (!empty($email))){
    $check = $con->prepare('SELECT email FROM subs WHERE email = ?');
    $check->execute([$email]);
    $row = $check->fetch();
    if($email == $row['email']){
        echo '<span>'.$email.' already in database, try another email!.</span>';
    }else{
        $subscribe = $con->prepare('INSERT INTO subs (name, email) VALUES (?, ?)');
        $subscribe->execute([$name, $email]);
        if($subscribe){
            echo '<span>Hi '.$name.'</b>,subscription is now active.</span>';
        }else{
            echo '<span>Try again</span>';
        }
    }
}else{
    echo '<span>please enter something</span>';
}
?>

the problem found at if($subscribe){

//the echo not showing the span element when data is inserted 

}

 

any help please?

Edited November 14, 2019 by cyberRobot
added code indents

Ive made this code:
Code: [Select]
<?php

$button = $_GET['submit'];
$search = $_GET['search'];


$s = $_GET['s'];
if (!$s)
$s = 0;


$e = 10; 


$next = $s + $e;
$prev = $s - $e;




 if (strlen($search)<=2)
  echo "Must be greater then 3 chars";
 else
 {
  echo "<br /><table><tr><td><img src='juzzy.jpg' /></td><td><form action='search.php' method='GET'><input type='text' onclick=value='' size='50' name='search' value='$search'> <input type='submit' name='submit' value='Search'></form></td></tr></table>";
  
  
  mysql_connect("localhost","*********","*******");
  mysql_select_db("************");
   
   
   $search_exploded = explode(" ",$search);
   
   foreach($search_exploded as $search_each)
   {
   
        
    $x++;
    if ($x==1)
     $construct .= "keywords LIKE '%$search_each%'";
    else
     $construct .= " OR keywords LIKE '%$search_each%'";
   
   }
   
 
  $constructx = "SELECT * FROM searchengine WHERE $construct";
  
  $construct = "SELECT * FROM searchengine WHERE $construct LIMIT $s,$e";
  
  $run = mysql_query($constructx);
  
  $foundnum = mysql_num_rows($run);  //here is the thing which is causing the error.

  $run_two = mysql_query("$construct");
  
  if ($foundnum==0)
   echo "No results found for <b>$search</b>";
  else
  {
   echo "<table bgcolor='#0000FF' width='100%' height='1px'><br /></table><table bgcolor='#f0f7f9' width='100%' height='10px'><tr><td><div align='right'>Showing 1-10 of <b>$foundnum</b> results found for <b>$search.</b></div></td></tr></table><p>";
   
   while ($runrows = mysql_fetch_assoc($run_two))
   {
   
   $title = $runrows['title'];
   $desc = $runrows['description'];
   $url = $runrows['url'];
   
   echo "<table width='300px'>
   <h4><a href='http://$url'><b>$title</b></a><br />
   $desc<br>
   <font color='00CC00'>$url</font></table></h4>
   ";
   }
?>

<table width='100%'>
<tr>
<td>
<div align="left">

<?php
if (!$s<=0)
 echo "<a href='search.php?search=$search&s=$prev'>Prev</a>";

$i =1; 
for ($x=0;$x<$foundnum;$x=$x+$e)
{


 echo " <a href='search.php?search=$search&s=$x'>$i</a> ";


$i++;


}

if ($s<$foundnum-$e)
  echo "<a href='search.php?search=$search&s=$next'>Next</a>";

}
}  


?>
</div>
</td>
</tr>
</table>
And when ive uploaded it to the host and tryed to search using it (this is just the main code, not the index code) it comes up with this one error:
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/seanhall/public_html/Search/search.php on line 54

here is code:
Code: [Select]
<?php
session_start(); // Must start session first thing
/* 
Created By Adam Khoury @ www.flashbuilding.com 
-----------------------June 20, 2008----------------------- 
*/
// Here we run a login check
if (!isset($_SESSION['id'])) { 
   echo 'Please <a href="login.php">log in</a> to access your account';
   exit(); 
}
//Connect to the database through our include 
include_once "connect_to_mysql.php";
// Place Session variable 'id' into local variable
$userid = $_SESSION['id'];
// Query member data from the database and ready it for display
$sql = mysql_query("SELECT * FROM members WHERE userid='$userid' LIMIT 1");
while($row = mysql_fetch_array($sql)){
$name = $row["name"];
$phone = $row["phone"];
$username = $row["username"];
$address = $row["address"];
$city = $row["city"];
$state = $row["state"];
$zip = $row["zip"];
$cell = $row["cell"];
$email = $row["email"];
$accounttype = $row["accounttype"];
$rank = $row["rank"];
$badges = $row["badges"];
}
// Set error message as blank upon arrival to page
$errorMsg = "";
// First we check to see if the form has been submitted 
if (isset($_POST['username'])){
$name = ereg_replace("[^A-Z a-z0-9]", "", $_POST['name']); // filter everything but numbers and letters
$phone = ereg_replace("[^A-Z a-z0-9]", "", $_POST['phone']); // filter everything but spaces, numbers, and letters
$username = ereg_replace("[^A-Z a-z0-9]", "", $_POST['username']); // filter everything but spaces, numbers, and letters
$address = ereg_replace("[^A-Z a-z0-9]", "", $_POST['address']); // filter everything but spaces, numbers, and letters
$city = ereg_replace("[^A-Za-z0-9]", "", $_POST['city']); // filter everything but lowercase letters
$state = ereg_replace("[^A-Za-z0-9]", "", $_POST['state']); // filter everything but lowercase letters
$zip = ereg_replace("[^A-Za-z0-9]", "", $_POST['zip']); // filter everything but lowercase letters
$cell = ereg_replace("[^A-Za-z0-9]", "", $_POST['cell']); // filter everything but lowercase letters
$email = stripslashes($_POST['email']);
$email = strip_tags($email);
$email = mysql_real_escape_string($email);

if((!$email)){

$errorMsg = "You did not submit the following required information!<br /><br />";

    if(!$email){ 
       $errorMsg .= "--- Email Address"; 
    
   }
} else { $sql = mysql_query("INSERT INTO events (name, phone, username, address, city, state, zip, cell, email) 

VALUES('$name','$phone','$username','$address','$city','$state','$zip','$cell','$email") or die (mysql_error());

$to = "$email";
// Change this to your site admin email
$from = "events@final.net46.net";
$subject = "Complete your registration";
//Begin HTML Email Message where you need to change the activation URL inside
$message = '<html>
<body bgcolor="#FFFFFF">
Hi ' . $username . ',
<br /><br />
You must complete this step to activate your account with us.
<br /><br />
Please click here to activate now &gt;&gt;
<a href="http://www.somewebsite.com/activation.php?id=' . $id . '">
ACTIVATE NOW</a>
<br /><br />
Your Login Data is as follows: 
<br /><br />
E-mail Address: ' . $email . ' <br />
Password: ' . $password . ' 
<br /><br /> 
Thanks! 
</body>
</html>';
// end of message
$headers = "From: $from\r\n";
$headers .= "Content-type: text/html\r\n";
$to = "$to";
// Finally send the activation email to the member
mail($to, $subject, $message, $headers);
// Then print a message to the browser for the joiner 
print "<br /><br /><br /><h4>OK $firstname, one last step to verify your email identity:</h4><br />
We just sent an Activation link to: $email<br /><br />
<strong><font color=\"#990000\">Please check your email inbox in a moment</font></strong> to click on the Activation <br />
Link inside the message. After email activation you can log in.";


exit(); // Exit so the form and page does not display, just this success message
} // Close else after database duplicate field value checks
  } // Close else after missing vars check
 //Close if $_POST

 
?>
<?php


// if no id is specified, list the available articles
if(!isset($_GET['eventid']))
{
   $self = $_SERVER['PHP_SELF'];

   $query = "SELECT eventid, event FROM Registration ORDER BY eventid";
   $result = mysql_query($query) or die('Error : ' . mysql_error());
  
   // create the article list
   $description = '<ol>';
   while($row = mysql_fetch_array($result, MYSQL_NUM))
   {
      list($eventid, $event, $date) = $row;
      $description .= "<li><a href=\"$self?eventid=$eventid\">$event</a></li>\r\n";
   }

   $description .= '</ol>';

   $Events = 'Events';
} else {
   // get the article info from database
     $query = "SELECT event, description, startdate, enddate location, subevent1, subevent2, subevent3, subevent4, subevent5, subevent6, subevent7, subevent8, price1, price2, price3, price4, price5, price6, price7, price8 FROM Registration WHERE eventid=".$_GET['eventid'];
   $result = mysql_query($query) or die('Error : ' . mysql_error());
   $row = mysql_fetch_array($result, MYSQL_ASSOC);

  $event = $row['event'];
   $description = $row['description'];
   $startdate = $row['startdate'];
     $enddate = $row['enddate'];

     $location = $row['location'];
 $subevent1 = $row['subevent1'];
$subevent2 = $row['subevent2'];
$subevent3 = $row['subevent3'];
$subevent4 = $row['subevent4'];
$subevent5 = $row['subevent5'];
$subevent6 = $row['subevent6'];
$subevent7 = $row['subevent7'];
$subevent8 = $row['subevent8'];

$price1 = $row['price1'];
$price2 = $row['price2'];
$price3 = $row['price3'];
$price4 = $row['price4'];
$price5 = $row['price5'];
$price6 = $row['price6'];
$price7 = $row['price7'];
$price8 = $row['price8'];
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Register</title>
<style type="text/css">
#apDiv1 {
position:absolute;
left:33px;
top:320px;
width:252px;
height:48px;
z-index:1;
}
#apDiv2 {
position:absolute;
left:33px;
top:361px;
width:254px;
height:46px;
z-index:2;
}
#apDiv3 {
position:absolute;
left:33px;
top:525px;
width:256px;
height:43px;
z-index:3;
}
#apDiv4 {
position:absolute;
left:33px;
top:402px;
width:250px;
height:48px;
z-index:4;
}
#apDiv5 {
position:absolute;
left:106px;
top:616px;
width:263px;
height:255px;
z-index:5;
}
#apDiv6 {
position:absolute;
left:323px;
top:200px;
width:898px;
height:530px;
z-index:5;
}
#apDiv7 {
position:absolute;
left:33px;
top:443px;
width:266px;
height:42px;
z-index:6;
}
#apDiv8 {
position:absolute;
left:111px;
top:500px;
width:125px;
height:37px;
z-index:7;
}
#apDiv8 strong {
font-size: 24px;
}
#apDiv9 {
position:absolute;
left:33px;
top:408px;
width:267px;
height:49px;
z-index:8;
}
#apDiv10 {
position:absolute;
left:33px;
top:449px;
width:242px;
height:23px;
z-index:9;
}
#apDiv8 a {
color: #000;
}
#apDiv11 {
position:absolute;
left:101px;
top:490px;
width:168px;
height:42px;
z-index:10;
font-size: 24px;
font-weight: bold;
}
#apDiv11 a {
color: #000;
}
#apDiv12 {
position:absolute;
left:33px;
top:210px;
width:205px;
height:107px;
z-index:11;
}
#apDiv12 {
text-align: center;
}
#apDiv13 {
position:absolute;
left:33px;
top:320px;
width:248px;
height:47px;
z-index:12;
}
#apDiv {
position:absolute;
left:33px;
top:484px;
width:225px;
height:35px;
z-index:11;
}
#apDiv14 {
position:absolute;
left:33px;
top:566px;
width:298px;
height:51px;
z-index:12;
}
#apDiv15 { position:absolute;
left:101px;
top:611px;
width:168px;
height:42px;
z-index:10;
font-size: 24px;
font-weight: bold;
}
#apDiv5 a {
font-size: 24px;
color: #000;
font-weight: bold;
}
#apDiv23 table tr td1 {
font-size: 14px;
}
</style>
<script type="text/javascript">
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
</script>

<style type="text/css">
#apDiv6 #form1 table tr th {
text-align: center;
}
#apDiv6 table tr td table tr td {
text-align: center;
}
#apDiv16 {
position:absolute;
left:330px;
top:45px;
width:208px;
height:100px;
z-index:13;
}
#apDiv6 table tr td #apDiv16 table tr th {
font-size: 36px;
}
#apDiv17 {
position:absolute;
left:183px;
top:342px;
width:427px;
height:65px;
z-index:13;
}
#apDiv6 table tr td #Accordion1 .AccordionPanel.AccordionPanelOpen .AccordionPanelContent #apDiv17 table tr th {
color: #999;
}
</style>

<style type="text/css">

#apDiv19 {
position:absolute;
left:33px;
top:320px;
width:271px;
height:33px;
z-index:13;
}
#apDiv20 {
position:absolute;
left:578px;
top:368px;
width:157px;
height:87px;
z-index:14;
}
#apDiv21 {
position:absolute;
left:8px;
top:705px;
width:270px;
height:683px;
z-index:15;
}
#apDiv22 {
position:absolute;
left:476px;
top:313px;
width:596px;
height:124px;
z-index:16;
}
#apDiv6 table tr td table tr th {
text-align: left;
}
#apDiv23 {
position:absolute;
left:626px;
top:250px;
width:247px;
height:85px;
z-index:16;
text-align: center;
font-size: 36px;
}
#apDiv23 table tr td {
text-align: center;
font-size: 24px;
}
#apDiv24 {
position:absolute;
left:626px;
top:295px;
width:247px;
height:63px;
z-index:17;
text-align: center;
font-size: 20px;
}
.klgjsa {
font-size: 18px;
}
#apDiv24 {
font-size: 16px;
}
#apDiv24 {
font-size: 18px;
}
#apDiv24 {
color: #C90;
}
</style>


</head>
<body onload="MM_preloadImages('button/pictures2.png','button/projects1.png','button/news2.png','button/eventmanager2.png','button/membermanager2.png','button/newsmanager2.png','button/myprofile2.png')">
<div id="apDiv6">
<table width="600" border="0" align="center" cellpadding="10" cellspacing="1" bgcolor="#336699">
  <tr>
  <td bgcolor="#FFFFFF"><h1 align="center"><?php echo $Events; ?></h1>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p><?php echo $description; ?></p>
   
  <p>&nbsp;</p>
   
  <p>&nbsp;</p>
  <?php
$sql = mysql_query("SELECT * FROM members WHERE userid='$userid' LIMIT 1");
while($row = mysql_fetch_array($sql)){
$name = $row["name"];
$phone = $row["phone"];
$address = $row["address"];
$city = $row["city"];
$state = $row["state"];
$zip = $row["zip"];
$cell = $row["cell"];
$email = $row["email"];
}
$sql = mysql_query("SELECT * FROM Registration WHERE eventid=".$_GET['eventid']." LIMIT 1");
while($row = mysql_fetch_array($sql)){
$event= $row["event"];
$subevent1 = $row['subevent1'];
$subevent2 = $row['subevent2'];
$subevent3 = $row['subevent3'];
$subevent4 = $row['subevent4'];
$subevent5 = $row['subevent5'];
$subevent6 = $row['subevent6'];
$subevent7 = $row['subevent7'];
$subevent8 = $row['subevent8'];

$price1 = $row['price1'];
$price2 = $row['price2'];
$price3 = $row['price3'];
$price4 = $row['price4'];
$price5 = $row['price5'];
$price6 = $row['price6'];
$price7 = $row['price7'];
$price8 = $row['price8'];
}
?>
  <?php
// when displaying an article show a link
// to see the article list
if(isset($_GET['eventid']))
{
?>
  <div id="jQueryUIAccordion">
<h3>&nbsp;</h3>
<div>
<p>

   
    <table width="575" border="0" cellspacing="2" cellpadding="2">
      <tr>
        <th width="563" bgcolor="#999999" scope="col">Location</th>
        </tr>
      </table>
    <table width="574" height="16" border="0" cellpadding="2" cellspacing="2">
      <tr>
        <th height="12" scope="col"><?php echo $location; ?></th>
        </tr>
      </table>
    <table width="573" border="0" cellspacing="2" cellpadding="2">
      <tr>
        <th width="561" bgcolor="#999999" scope="col">Description</th>
        </tr>
      </table>
    <table width="576" border="0" cellspacing="2" cellpadding="2">
      <tr>
        <th width="564" height="11" scope="col"><?php echo $title1; ?><br /><?php echo $price1; ?></th>
        <th width="564" scope="col"><?php echo $subevent1; ?></th>
       

        </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title2; ?><br /><?php echo $price2; ?></th>
        <th scope="col"><?php echo $subevent2; ?> </th>
      </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title3; ?><br /><?php echo $price3; ?></th>
        <th scope="col"><?php echo $subevent3; ?></th>
      </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title4; ?><br /><?php echo $price4; ?></th>
        <th scope="col"><?php echo $subevent4; ?></th>
      </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title5; ?><br /><?php echo $price5; ?></th>
        <th scope="col"><?php echo $subevent5; ?></th>
      </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title6; ?><br /><?php echo $price6; ?></th>
        <th scope="col"><?php echo $subevent6; ?></th>
      </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title7; ?><br /><?php echo $price7; ?></th>
        <th scope="col"><?php echo $subevent7; ?></th>
      </tr>
      <tr>
        <th height="11" scope="col"><?php echo $title8; ?><br /><?php echo $price8; ?></th>
        <th scope="col"><?php echo $subevent8; ?></th>
      </tr>
      </table>
    <hr />
    <table width="200" border="0" cellspacing="2" cellpadding="2">
      <tr>
        <th scope="col">Price:</th>
        </tr>
      </table>
    <table width="200" border="0" cellspacing="2" cellpadding="2">
      <tr>
        <th scope="col">$<?php echo  $price; ?></th>
        </tr>
      </table>
</p>
<?php
if (isset($_GET['eventid'])) {
include('connect1.php');
$sql = mysql_query("SELECT * FROM Registration WHERE eventid='$eventid' LIMIT 1");
while($row = mysql_fetch_array($sql)){
$eventid = $row["eventid"];
$event = $row["event"];
$date = $row["date"];
$description = $row["description"];
$location = $row["location"];
}
$result = mysqli_query($dbcon, $query) or die('error getting data');

echo "<table>";
while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) {
echo "<tr><td>";
echo "<a href=\"registration.php?eventid=".$_GET['eventid']."\"><ul>Register Now!</ul></a>";
echo "</td></tr>";
}
echo "</table>";

}
?>

   
   
   
   
   

 
 
   
   
  <div id="apDiv18"></div>
  <p align="center"><a href="<?php echo $_SERVER['PHP_SELF']; ?>">Back to Events</a></p>
   
   
   
  <?php
}
?></td></tr>
</table>


</div><div id="apDiv2"><a href="register.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image3','','button/register2.png',1)"><img src="button/register1.png" name="Image3" width="235" height="50" border="0" id="Image3" /></a></div>
<div id="apDiv4"><a href="projects.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image4','','button/projects2.png',1)"><img src="button/projects1.png" name="Image4" width="235" height="50" border="0" id="Image4" /></a></div>

<div id="apDiv11"><?php if ($accounttype == "Scout") {
echo '<a href="../logout.php">Logout</a>';} ?></div>
<div id="apDiv12"><?php echo "$accounttype"; ?>
  <p><?php echo "$name"; ?></p>
  <p>Troop 78</p>
</div>

<div id="apDiv5"><?php if ($accounttype == "Admin") {
echo "<a href=\"../logout.php\">Logout</a>";
}
?></div>


<div id="apDiv7"><a href="news.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image6','','button/news2.png',1)"><img src="button/news1.png" name="Image6" width="235" height="50" border="0" id="Image6" /></a></div>
<div id="apDiv"> <?php if ($accounttype == "Admin") {
echo "<a href=\"../search1.php\" onmouseout=\"MM_swapImgRestore()\" onmouseover=\"MM_swapImage('Image7','','../button/membermanager2.png',1)\"><img src=\"../button/membermanager1.png\" name=\"Image7\" width=\"235\" height=\"50\" border=\"0\" id=\"Image7\" /></a>";
} 
?></div>
<div id="apDiv3"><?php if ($accounttype == "Admin") {
echo "<a href=\"../eventmanager.php\" onmouseout=\"MM_swapImgRestore()\" onmouseover=\"MM_swapImage('Image8','','../button/eventmanager2.png',1)\"><img src=\"../button/eventmanager1.png\"  name=\"Image8\" width=\"235\" height=\"50\" border=\"0\" id=\"Image8\" /></a>";
}
?>
</div>
<div id="apDiv14"><?php if ($accounttype == "Admin") {
echo "<a href=\"../newsmanager.php\" onmouseout=\"MM_swapImgRestore()\" onmouseover=\"MM_swapImage('Image9','','../button/newsmanager2.png',1)\"><img src=\"../button/newsmanager1.png\"  name=\"Image9\" width=\"235\" height=\"50\" border=\"0\" id=\"Image9\" /></a>";
}
?>
</div>

<div id="apDiv19"><a href="myprofile.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image5','','button/myprofile2.png',1)"><img src="button/myprofile1.png" name="Image5" width="235" height="50" border="0" id="Image5" /></a></div>
<div id="apDiv21"><img src="button/red.png" width="282" height="687" /></div>
<div id="apDiv23"><?php echo $event; ?> <br />
</div>
<div id="apDiv24"><?php echo $startdate;?> <span class="klgjsa">-</span> <?php echo $enddate; ?></div>
<img name="boyscout" src="buttons/boyscout.jpg" width="1180" height="700" border="0" id="boyscout" alt="" />
</body>
</html>
here is error:
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/a6254834/public_html/register.php on line 469

help?

Ok, so basically what I want is the code to check the DB to see if a passworded username is already taken, then display an error if someone tries to post with that same name, but gives a wrong password for that name.  What the code below does, is just that....except, even when you enter the correct password, it displays the error that the name has been taken...how can I fix this so when you enter the right password, it allows you to post?

<script src="http://code.jquery.com/jquery-latest.js" type="text/javascript" charset="utf-8"></script>
<script language="javascript" type="text/javascript">
//<![CDATA[
$(document).ready(function(){
$("form#reply").submit(function() {
var success = 0;
var username     = $('#user').attr('value');
$.ajax({
type: "GET",
url: "checkusername.php",
data: "username="+ username,
success: function(r){
success = r;
}, async:false
});
if(success == 1) {
alert("Username already taken.");
return false;
}else return true;
});
});
//]]>
</script>


The checkusername.php code is:

<?php
require "database.php";
#check user on users table
$user = fetch("SELECT COUNT(pid) FROM posts WHERE user = '".$_GET["username"]."'");
if(!$user || !isset($user)) echo '0';
if($user[0] > 0) echo '1'; else echo '0';
exit();
?>