Program1
<?php
// Include config file
// Define variables and initialize with empty values
$Firstname = $Lastname = $username = $password = $confirm_password = "";
$firstname_err = $lastname_err = $username_err = $password_err = $confirm_password_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Validate Firstname
if(empty(trim($_POST["Firstname"]))){
$firstname_err = "Please enter a Firstname.";
}elseif(empty(trim($_POST["Lastname"]))){
$lastname_err = "Please enter a Lastname.";
}elseif(!preg_match('', trim($_POST["Firstname"]))){
$firstname_err = "Firstname can only contain letters";
}elseif(!preg_match('', trim($_POST["Firstname"]))){
$lastname_err = "Firstname can only contain letters";
}elseif (strlen(trim($_POST["Firstname"])) > 25){
$password_err = "Firstname is too long, Only allow 25 characters.";
}else(strlen(trim($_POST["Lastname") > 25){
$password_err = "Lastname is too long, Only allow 25 characters.";
}
// Validate username
if(empty(trim($_POST["username"]))){
$password_err = "Please enter a username.";
} elseif(strlen(trim($_POST["username"])) > 12){
$password_err = "username must only have 12 characters maximum.";
} else{
$password = trim($_POST["password"]);
}
// Validate password
if(empty(trim($_POST["password"]))){
$password_err = "Please enter a password.";
} elseif(strlen(trim($_POST["password"])) > 12){
$password_err = "Password must only have 12 characters maximum.";
} else{
$password = trim($_POST["password"]);
}
// Validate confirm password
if(empty(trim($_POST["confirm_password"]))){
$confirm_password_err = "Please confirm password.";
} else{
$confirm_password = trim($_POST["confirm_password"]);
if(empty($password_err) && ($password != $confirm_password)){
$confirm_password_err = "Password did not match.";
}
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Sign Up</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<style>
body{ font: 14px sans-serif; }
.wrapper{ width: 360px; padding: 20px; }
</style>
</head>
<body>
<div class="wrapper">
<h2>Sign Up</h2>
<p>Please fill this form to create an account.</p>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
<div class="form-group">
<label>Firstname</label>
<input type="text" name="Firstname" class="form-control <?php echo (!empty($firstname_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $Firstname; ?>">
<span class="invalid-feedback"><?php echo $firstname_err; ?></span>
</div>
<div class="form-group">
<label>Lastname</label>
<input type="text" name="Lastname" class="form-control <?php echo (!empty($lastname_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $Lastname; ?>">
<span class="invalid-feedback"><?php echo $lastname_err; ?></span>
</div>
<div class="form-group">
<label>Lastname</label>
<input type="text" name="username" class="form-control <?php echo (!empty($username_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $username; ?>">
<span class="invalid-feedback"><?php echo $username_err; ?></span>
</div>
<div class="form-group">
<label>Password</label>
<input type="password" name="password" class="form-control <?php echo (!empty($password_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $password; ?>">
<span class="invalid-feedback"><?php echo $password_err; ?></span>
</div>
<div class="form-group">
<label>Confirm Password</label>
<input type="password" name="confirm_password" class="form-control <?php echo (!empty($confirm_password_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $confirm_password; ?>">
<span class="invalid-feedback"><?php echo $confirm_password_err; ?></span>
</div>
<div class="form-group">
<input type="submit" class="btn btn-primary" value="Submit">
</div>
</form>
</div>