Description
This shows how to make a simple registration form.
Snippet
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<?php
if(isset($_POST['submit'])){
# connect to the database here
# search the database to see if the user name has been taken or not
$query = sprintf("SELECT * FROM users WHERE user_name='%s' LIMIT 1",mysql_real_escape_string($_POST['user_name']));
$sql = mysql_query($query);
$row = mysql_fetch_array($sql);
#check too see what fields have been left empty, and if the passwords match
if($row||empty($_POST['user_name'])|| empty($_POST['fname'])||empty($_POST['lname'])|| empty($_POST['email'])||empty($_POST['password'])|| empty($_POST['re_password'])||$_POST['password']!=$_POST['re_password']){
# if a field is empty, or the passwords don't match make a message
$error = '<p>';
if(empty($_POST['user_name'])){
$error .= 'User Name can\'t be empty<br>';
}
if(empty($_POST['fname'])){
$error .= 'First Name can\'t be empty<br>';
}
if(empty($_POST['lname'])){
$error .= 'Last Name can\'t be empty<br>';
}
if(empty($_POST['email'])){
$error .= 'Email can\'t be empty<br>';
}
if(empty($_POST['password'])){
$error .= 'Password can\'t be empty<br>';
}
if(empty($_POST['re_password'])){
$error .= 'You must re-type your password<br>';
}
if($_POST['password']!=$_POST['re_password']){
$error .= 'Passwords don\'t match<br>';
}
if($row){
$error .= 'User Name already exists<br>';
}
$error .= '</p>'
}else{
# If all fields are not empty, and the passwords match,
# create a session, and session variables,
$query = sprintf("INSERT INTO users_table(`user_name`,`f_name`,`l_name`,`email`,`password`)
VALUES('%s','%s','%s','%s',PASSWORD('%s'))",
mysql_real_escape_string($_POST['user_name']),
mysql_real_escape_string($_POST['fname']),
mysql_real_escape_string($_POST['lname']),
mysql_real_escape_string($_POST['email']),
mysql_real_escape_string($_POST['password']))or die(mysql_error());
$sql = mysql_query($query);
# Redirect the user to a login page
header("Location: login.php");
exit;
}
}
# echo out each variable that was set from above,
# then destroy the variable.
if(isset($error)){
echo $error;
unset($error);
}
?>
<!-- Start your HTML/CSS/JavaScript here -->
<form action="<? echo $_SERVER['PHP_SELF']; ?>" method="post">
<p>User Name:<br /><input type="text" name="user_name" <? if(!$row){echo 'value="'.$_POST['user_name'].'"';} ?>/></p>
<p>First Name:<br /><input type="text" name="fname" <? echo 'value="'.$_POST['fname'].'"'; ?>/></p>
<p>Last Name:<br /><input type="text" name="lname" <? echo 'value="'.$_POST['lname'].'"'; ?>/></p>
<p>Email:<br /><input type="text" name="email" <? echo 'value="'.$_POST['email'].'"'; ?>/></p>
<p>Password:<br /><input type="password" name="password" /></p>
<p>Re-Type Password:<br /><input type="password" name="re_password" /></p>
<p><input type="submit" name="submit" value="Sign Up" /></p>
</form> 
while (extract($_POST) == '' && isset($_POST['submit']))
It still may need to be modified, if you don't feel it works for you.