Figuring out form validation

[broC]

had problem with my coding..its prompt error if i leave the form blank then submit,however,its still query and go to databsee..can sumbody check for me n teach me wheres mymistake

 
<table width="1000" height="95" border="1">
 <tr>
 <td bgcolor="#0000FF">&nbsp;</td>
 </tr>
</table>
<center>
<?
 include("connect.php"); 
 //this is your validation in the form,put it here....
 { if (empty($_POST['name']))
 { 
 $errors[] = 'Please enter a name';
 }
 if (empty($_POST['email']))
 {
 $errors[] = 'Please enter a valid e-mail address';
 }
 else if (!eregi("^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$", 
 $_POST['email']))
 {
 $errors[] = 'Please enter a valid e-mail address';
 }
 if (empty($_POST['contact']))
 {
 $errors[] = 'Please enter a valid contact with numeric value';
 }
 else if (!is_numeric($_POST['contact']))
 {
 $errors[] = 'Please enter a valid contact with a numeric value';
 }
 
 
 if (empty($_POST['person_attend']))
 {
 $errors[] = 'Please enter some word for person attend';
 }
 
 
 else if (strlen ($_POST['person_attend']) > 255)
 {
 $errors[] = 'person attend';
 }
 
 
 
 if (empty($_POST['comment']))
 {
 $errors[] = 'Please enter some comment';
 }
 else if (strlen ($_POST['comment']) > 255)
 {
 $errors[] = 'comment ';
 
 }
 
 if(isset($errors))
{
foreach($errors as $val)
{
echo "Error: $val <br/>"; 
}
}
 
 
 if($name="" && $email="" && $contact="" && $person_attend="" && $comment="" )
 
 {
 
 //insert statements
 
 } else {
 
 //error message
 
 }
 
 //process form
 
 //this is your add query....
 
 $name = $_POST['name'];
 
 $email = $_POST['email'];
 
 $contact = $_POST['contact'];
 
 $person_attend = $_POST['person_attend'];
 
 $comment = $_POST['comment'];
 
 $query = "INSERT INTO rsvp (id, name, email, contact, person_attend, comment)
 
 VALUES ('', '$name', '$email', '$contact', '$person_attend', '$comment')";
 
 $results = mysql_query($query) or die
 
 ("Could not execute query : $query." . mysql_error());
 
 {
 
 echo "thanks you ";
 
 }
 
 mysql_close();
 }
 
?>
</center>
<center> 
<br>
<a href="Index.php">View list attend</a><br>
<a href="register.html">Clik here to register</a>
</center>
 

[deMorte]

There seems to be few issues in your code. Here's what I spotted.

You should create the variables you are testing before you use them. So you have to move this

$name = $_POST['name']; 
$email = $_POST['email']; 
$contact = $_POST['contact']; 
$person_attend = $_POST['person_attend']; 
$comment = $_POST['comment']; 

above testing. Also, you should note that the comparison operator is '==', not '='.

 if($name=="" && $email=="" && $contact=="" && $person_attend=="" && $comment=="" ) { 

Also, you stating that if all the inputs are empty there is an insert? This is probably not what you want?

This is how I would implement your code:

$name = $_POST['name']; 
$email = $_POST['email']; 
$contact = $_POST['contact']; 
$person_attend = $_POST['person_attend']; 
$comment = $_POST['comment']; 
if (empty($name)) 
$errors[] = 'Please enter a name'; 
} 
// other error testings in the same way... 
if(!is_array($errors)) { 
  
 $query = "INSERT INTO rsvp (id, name, email, contact, person_attend, comment) VALUES ('', '$name', '$email', '$contact', '$person_attend', '$comment')"; 
  
 $results = mysql_query($query) or die 
 ("Could not execute query : $query." . mysql_error()); 
  
 mysql_close(); 
} else { 
 foreach($errors as $val) { 
 echo "Error: $val <br/>"; 
 }  
}  

So, if $errors is not an array (there are no errors) you go to Insert-code, otherwise you print out the errors.

Hope this helps.

PS. I did not test this code so there could be typos in there.