Error in captcha

Question

Error in captcha

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#1 by (1 votes)

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I have the following error in captcha:

Notice: Undefined index: captcha in C: \ xampp \ htdocs \ darknetwork \ index.php on> line 7

and also it is only returning me the same one if it gives an F5 in the page, the session_start(); is already in the config.php

index.php

<?php
require 'config.php';
require 'classes/usuarios.class.php';
$ip = $_SERVER["REMOTE_ADDR"];

$u = new Usuarios;
if($_SESSION['captcha'] == $_POST['captcha']) {

  if(isset($_POST['email']) and !empty($_POST['email'])) {
    $email = addslashes($_POST['email']);
    $senha = addslashes($_POST['senha']);

  if($u->login($email, $senha)) {

    header("Location: central.php");

  } else {
  ?>

  <div align="center" class="alert alert-danger">
  E-mail e/ou Senha incorretos, tente novamente !
  </div>

  <?php
          }
      }
  } else {
  ?>

  <div align="center" class="alert alert-danger">
  Captcha esta incorreto !
  </div>
  <?php
  }
   ?>

<!DOCTYPE html>
<html>
<head>
    <title>Dark Network</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link rel="stylesheet" href="assets/css/style.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script><scriptsrc="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
<div class="login-page">
  <div class="form">
  <div style="color:#fff;" class="h4">
      ÁREA DE LOGIN - DARK NETWORK
    </div>
    <form class="login-form" method="post">
      <hr>
      <input type="email" name="email" placeholder="E-mail" required=""/>
      <input type="password" name="senha" placeholder="Senha" required=""/><br/><br/>
      <img src="captcha.php" alt="Código captcha"/><br/><br/>
      <input type="text" name="captcha" placeholder="Digite o código" required=""/><br/>
      <button type="submit"><span>Entrar</span></button>
      <hr>
      <p class="message">Não é registrado ? <a href="cadastrar.php">Cadastre-se aqui.</a></p>
      <p style="color:#999;">Desenvolvido por: Weltec</p>
    </form>
</div>

'

captcha.php

<?php
session_start();

$codigoCaptcha = substr(md5(time().rand(0,999)), 0, 9);

$_SESSION['captcha'] = $codigoCaptcha;

$imagemCaptcha = imagecreatefrompng("fundocaptch.png");
$fonteCaptcha = imageloadfont("anonymous.gdf");
$corCaptcha = imagecolorallocate($imagemCaptcha, 0, 115, 50);

imagestring($imagemCaptcha, $fonteCaptcha, 15, 5, $codigoCaptcha, $corCaptcha);
imagepng($imagemCaptcha);
imagedestroy($imagemCaptcha);
?>

php captcha

asked by anonymous 25.11.2017 / 09:22

1 answer

Background dotted or striped in css How to enable or disable select closest?

score 1 · Answer 1

This is a notice and not a erro to know the difference see the link quoted by @Everson:

What is the difference between "notice" and "warning" in PHP?

However , even though it is a notice it is best to check if the submission was done by POST, you can use isset , empty or filter_input note that your if/else are running at all times.

Important details:

If you use isset or empty
isset can be used with more than one field

A simple example would be this:

<?php
require 'config.php';
require 'classes/usuarios.class.php';
$ip = $_SERVER["REMOTE_ADDR"];

//Uma variavel para o erro
$erro = null;

$u = new Usuarios;

//Checa se todos campos vieram do form
if (isset($_POST['captcha'], $_POST['captcha'], $_POST['email'], $_POST['senha'])) {
    if ($_SESSION['captcha'] == $_POST['captcha']) {
        $email = addslashes($_POST['email']);
        $senha = addslashes($_POST['senha']);

        if($u->login($email, $senha)) {

            header("Location: central.php");
            exit; //Isso impede de "baixar" o resto

        } else {
            $erro = 'E-mail e/ou Senha incorretos, tente novamente !';
        }
    } else {
        $erro = 'Captcha esta incorreto !';
    }
}

<!DOCTYPE html>
<html>
<head>
    <title>Dark Network</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link rel="stylesheet" href="assets/css/style.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script><scriptsrc="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>

<?php if ($erro) { /*se $erro não for null então é exibido */ ?>

<div align="center" class="alert alert-danger"><?php $erro; ?></div>

<?php } ?>

<div class="login-page">
  <div class="form">