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Ejemplo 1: inicio de sesión y registro de usuario de php
<?php
session_start();// initializing variables
$username ="";
$email ="";
$errors= array();// connect to the database
$db = mysqli_connect('localhost','root','','registration');// REGISTER USERif(isset($_POST['reg_user']))
// receive all input values from the form
$username = mysqli_real_escape_string($db, $_POST['username']);
$email = mysqli_real_escape_string($db, $_POST['email']);
$password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
$password_2 = mysqli_real_escape_string($db, $_POST['password_2']);// form validation: ensure that the form is correctly filled ...// by adding (array_push()) corresponding error unto $errors arrayif(empty($username)) array_push($errors,"Username is required");
if(empty($email)) array_push($errors,"Email is required");
if(empty($password_1)) array_push($errors,"Password is required");
if($password_1 != $password_2)
array_push($errors,"The two passwords do not match");
// first check the database to make sure // a user does not already exist with the same username and/or email
$user_check_query ="SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
$result = mysqli_query($db, $user_check_query);
$user= mysqli_fetch_assoc($result);if($user) // if user existsif($user['username']=== $username)
array_push($errors,"Username already exists");
if($user['email']=== $email)
array_push($errors,"email already exists");
// Finally, register user if there are no errors in the formif(count($errors)==0)
$password = md5($password_1);//encrypt the password before saving in the database
$query ="INSERT INTO users (username, email, password)
VALUES('$username', '$email', '$password')";
mysqli_query($db, $query);
$_SESSION['username']= $username;
$_SESSION['success']="You are now logged in";
header('location: index.php');
// ...Ejemplo 2: cómo crear una base de datos de registro
<html><head><title>PHP User Registration Form</title><link href="./css/style.css" rel="stylesheet"type="text/css"/></head><body><form name="frmRegistration" method="post"action=""><div class="demo-table"><div class="form-head">Sign Up</div><?php
if(! empty($errorMessage)&& is_array($errorMessage))
?><div class="error-message"><?php
foreach($errorMessage as $message)
echo $message ."
";
?></div><?php
?><div class="field-column"><label>Username</label><div><input type="text" class="demo-input-box"
name="userName"value=""></div></div><div class="field-column"><label>Password</label><div><input type="password" class="demo-input-box"
name="password"value=""></div></div><div class="field-column"><label>Confirm Password</label><div><input type="password" class="demo-input-box"
name="confirm_password"value=""></div></div><div class="field-column"><label>Display Name</label><div><input type="text" class="demo-input-box"
name="firstName"value=""></div></div><div class="field-column"><label>Email</label><div><input type="text" class="demo-input-box"
name="userEmail"value=""></div></div><div class="field-column"><div class="terms"><input type="checkbox" name="terms"> I accept terms
and conditions
</div><div><input type="submit"
name="register-user"value="Register"
class="btnRegister"></div></div></div></form></body></html>Comentarios y puntuaciones del tutorial
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