function validateForename(field)
{
return (field == "") ? "No Forename was entered.
" : ""
}
function validateSurname(field)
{
return (field == "") ? "No Surname was entered.
" : ""
}
function validateUsername(field)
{
if (field == "") return "No Username was entered.
"
else if (field.length < 5)
return "Usernames must be at least 5 characters.
"
else if (/[^a-zA-Z0-9_-]/.test(field))
return "Only a-z, A-Z, 0-9, - and _ allowed in Usernames.
"
return ""
}
function validatePassword(field)
{
if (field == "") return "No Password was entered.
"
else if (field.length < 6)
return "Passwords must be at least 6 characters.
"
else if (!/[a-z]/.test(field) || ! /[A-Z]/.test(field) ||
!/[0-9]/.test(field))
return "Passwords require one each of a-z, A-Z and 0-9.
"
return ""
}
function validateAge(field)
{
if (field == "" || isNaN(field)) return "No Age was entered.
"
else if (field < 18 || field > 110)
return "Age must be between 18 and 110.
"
return ""
}
function validateEmail(field)
{
if (field == "") return "No Email was entered.
"
else if (!((field.indexOf(".") > 0) &&
(field.indexOf("@") > 0)) ||
/[^a-zA-Z0-9.@_-]/.test(field))
return "The Email address is invalid.
"
return ""
}
<?php // adduser.php
// Start with the PHP code
$forename = $surname = $username = $password = $age = $email = "";
if (isset($_POST['forename']))
$forename = fix_string($_POST['forename']);
if (isset($_POST['surname']))
$surname = fix_string($_POST['surname']);
if (isset($_POST['username']))
$username = fix_string($_POST['username']);
if (isset($_POST['password']))
$password = fix_string($_POST['password']);
if (isset($_POST['age']))
$age = fix_string($_POST['age']);
if (isset($_POST['email']))
$email = fix_string($_POST['email']);
$fail = validate_forename($forename);
$fail .= validate_surname($surname);
$fail .= validate_username($username);
$fail .= validate_password($password);
$fail .= validate_age($age);
$fail .= validate_email($email);
echo "<!DOCTYPE html>
<html><head><title>An Example Form</title>";
if ($fail == "")
{
echo "</head><body>Form data successfully validated:
$forename, $surname, $username, $password, $age, $email.</body></html>";
// This is where you would enter the posted fields into a database,
// preferably using hash encryption for the password.
exit;
}
echo <<<_END
<!-- The HTML/JavaScript section -->
<style>
.signup {
border: 1px solid #999999;
font: normal 14px helvetica; color:#444444;
}
</style>
<script>
function validate(form)
{
fail = validateForename(form.forename.value)
fail += validateSurname(form.surname.value)
fail += validateUsername(form.username.value)
fail += validatePassword(form.password.value)
fail += validateAge(form.age.value)
fail += validateEmail(form.email.value)
if (fail == "") return true
else { alert(fail); return false }
}
function validateForename(field)
{
return (field == "") ? "No Forename was entered.\n" : ""
}
function validateSurname(field)
{
return (field == "") ? "No Surname was entered.\n" : ""
}
function validateUsername(field)
{
if (field == "") return "No Username was entered.\n"
else if (field.length < 5)
return "Usernames must be at least 5 characters.\n"
else if (/[^a-zA-Z0-9_-]/.test(field))
return "Only a-z, A-Z, 0-9, - and _ allowed in Usernames.\n"
return ""
}
function validatePassword(field)
{
if (field == "") return "No Password was entered.\n"
else if (field.length < 6)
return "Passwords must be at least 6 characters.\n"
else if (!/[a-z]/.test(field) || ! /[A-Z]/.test(field) ||
!/[0-9]/.test(field))
return "Passwords require one each of a-z, A-Z and 0-9.\n"
return ""
}
function validateAge(field)
{
if (isNaN(field)) return "No Age was entered.\n"
else if (field < 18 || field > 110)
return "Age must be between 18 and 110.\n"
return ""
}
function validateEmail(field)
{
if (field == "") return "No Email was entered.\n"
else if (!((field.indexOf(".") > 0) &&
(field.indexOf("@") > 0)) ||
/[^a-zA-Z0-9.@_-]/.test(field))
return "The Email address is invalid.\n"
return ""
}
</script>
</head>
<body>
<table border="0" cellpadding="2" cellspacing="5" bgcolor="#eeeeee">
<th colspan="2" align="center">Signup Form</th>
<tr><td colspan="2">Sorry, the following errors were found<br>
in your form: <p><font color=red size=1><i>$fail</i></font></p>
</td></tr>
<form method="post" action="adduser.php" onSubmit="return validate(this)">
<tr><td>Forename</td>
<td><input type="text" maxlength="32" name="forename" value="$forename">
</td></tr><tr><td>Surname</td>
<td><input type="text" maxlength="32" name="surname" value="$surname">
</td></tr><tr><td>Username</td>
<td><input type="text" maxlength="16" name="username" value="$username">
</td></tr><tr><td>Password</td>
<td><input type="text" maxlength="12" name="password" value="$password">
</td></tr><tr><td>Age</td>
<td><input type="text" maxlength="3" name="age" value="$age">
</td></tr><tr><td>Email</td>
<td><input type="text" maxlength="64" name="email" value="$email">
</td></tr><tr><td colspan="2" align="center"><input type="submit"
value="Signup"></td></tr>
</form>
</table>
</body>
</html>
_END;
// The PHP functions
function validate_forename($field)
{
return ($field == "") ? "No Forename was entered<br>": "";
}
function validate_surname($field)
{
return($field == "") ? "No Surname was entered<br>" : "";
}
function validate_username($field)
{
if ($field == "") return "No Username was entered<br>";
else if (strlen($field) < 5)
return "Usernames must be at least 5 characters<br>";
else if (preg_match("/[^a-zA-Z0-9_-]/", $field))
return "Only letters, numbers, - and _ in usernames<br>";
return "";
}
function validate_password($field)
{
if ($field == "") return "No Password was entered<br>";
else if (strlen($field) < 6)
return "Passwords must be at least 6 characters<br>";
else if (!preg_match("/[a-z]/", $field) ||
!preg_match("/[A-Z]/", $field) ||
!preg_match("/[0-9]/", $field))
return "Passwords require 1 each of a-z, A-Z and 0-9<br>";
return "";
}
function validate_age($field)
{
if ($field == "") return "No Age was entered<br>";
else if ($field < 18 || $field > 110)
return "Age must be between 18 and 110<br>";
return "";
}
function validate_email($field)
{
if ($field == "") return "No Email was entered<br>";
else if (!((strpos($field, ".") > 0) &&
(strpos($field, "@") > 0)) ||
preg_match("/[^a-zA-Z0-9.@_-]/", $field))
return "The Email address is invalid<br>";
return "";
}
function fix_string($string)
{
if (get_magic_quotes_gpc()) $string = stripslashes($string);
return htmlentities ($string);
}
?>
<!DOCTYPE html>
<html>
<head>
<title>An Example Form</title>
<style>
.signup {
border:1px solid #999999;
font: normal 14px helvetica;
color: #444444;
}
</style>
<script>
function validate(form)
{
fail = validateForename(form.forename.value)
fail += validateSurname(form.surname.value)
fail += validateUsername(form.username.value)
fail += validatePassword(form.password.value)
fail += validateAge(form.age.value)
fail += validateEmail(form.email.value)
if (fail == "") return true
else { alert(fail); return false }
}
function validateForename(field)
{
return (field == "") ? "No Forename was entered.
" : ""
}
function validateSurname(field)
{
return (field == "") ? "No Surname was entered.
" : ""
}
function validateUsername(field)
{
if (field == "") return "No Username was entered.
"
else if (field.length < 5)
return "Usernames must be at least 5 characters.
"
else if (/[^a-zA-Z0-9_-]/.test(field))
return "Only a-z, A-Z, 0-9, - and _ allowed in Usernames.
"
return ""
}
function validatePassword(field)
{
if (field == "") return "No Password was entered.
"
else if (field.length < 6)
return "Passwords must be at least 6 characters.
"
else if (! /[a-z]/.test(field) ||
! /[A-Z]/.test(field) ||
! /[0-9]/.test(field))
return "Passwords require one each of a-z, A-Z and 0-9.
"
return ""
}
function validateAge(field)
{
if (isNaN(field)) return "No Age was entered.\n"
else if (field < 18 || field > 110)
return "Age must be between 18 and 110.
"
return ""
}
function validateEmail(field)
{
if (field == "") return "No Email was entered.
"
else if (!((field.indexOf(".") > 0) &&
(field.indexOf("@") > 0)) ||
/[^a-zA-Z0-9.@_-]/.test(field))
return "The Email address is invalid.
"
return ""
}
</script>
</head>
<body>
<table class="signup" border="0" cellpadding="2" cellspacing="5" bgcolor="#eeeeee">
<th colspan="2" align="center">Signup Form</th>
<form method="post" action="adduser.php" onsubmit="return validate(this)">
<tr><td>Forename</td>
<td><input type="text" maxlength="32" name="forename"></td></tr>
<tr><td>Surname</td>
<td><input type="text" maxlength="32" name="surname"></td></tr>
<tr><td>Username</td>
<td><input type="text" maxlength="16" name="username"></td></tr>
<tr><td>Password</td>
<td><input type="text" maxlength="12" name="password"></td></tr>
<tr><td>Age</td>
<td><input type="text" maxlength="3" name="age"></td></tr>
<tr><td>Email</td>
<td><input type="text" maxlength="64" name="email"></td></tr>
<tr><td colspan="2" align="center"><input type="submit" value="Signup"></td></tr>
</form>
</table>
</body>
</html>