验证码验证不工作

Question

这是生成验证码图片的文件：
captcha.php

<?php
    generateCaptcha();
    exit();

    function generateCaptcha() {

        $captcha = 'ABCDEFGHJKLMNPQRSTUVWXYZ123456789abcdefghijkmnpqrstuvwxyz';
        $captcha = substr(str_shuffle($captcha), 0, 6);
        $_SESSION['captcha'] = $captcha;    // This is NOT working!!

        $font_size = 40;
        $img_height = 60;
        $img_width = 170;

        $image = imagecreate($img_width, $img_height);
        imagecolorallocate($image, 255, 255, 255);

        $text_color = imagecolorallocate($image, 0, 0, 0);
        imagettftext($image, $font_size, 0, 0, 50, $text_color, 'font/monofont.ttf', $captcha);

        header('Content-type: image/png');
        imagepng($image);

        imagedestroy($image);
    }
?>

这是我的 index.php 文件：

<?php
    require_once "includes/functions.php";
    sec_session_start();
?>
<!DOCTYPE html>
<html>
<body>
<form action="process.php" method="most">
    <?php echo "<img src='captcha.php'>"; ?>
    <input type="text" name="captcha">
    <input type="submit" name="VerifyCaptcha" value="Verify Humanship">
</form>
</body>
</html>

这是我的process.php文件：

<?php
    if(isset($_SESSION['captcha'])) {
        if($_SESSION['captcha'] == $_POST['captcha'])
            echo "You're a human!";
        else echo "I doubt you!";
    } else header('Location: ../');
?>

文件 captcha.php 中的第 9 行无效。不生成会话变量。任何修复？

Answer 1

您可能在考虑对 $_SESSION 数组执行任何操作之前忘记调用 session_start();。

这一行应该是执行的第一行（不完全是，但你明白了），所以我建议把它放在include require_once指令之前，如下：

<?php
    session_start();
    require_once "includes/functions.php";
    sec_session_start();
?>
<!DOCTYPE html>
<html>
<body>
<form action="process.php" method="most">
    <?php echo "<img src='captcha.php'>"; ?>
    <input type="text" name="captcha">
    <input type="submit" name="VerifyCaptcha" value="Verify Humanship">
</form>
</body>
</html>

确保在 captcha.php 中执行相同的操作。

我不完全确定 sec_session_start 的作用，请尝试将该行放在 require_once 之前，看看是否可以解决问题。

Answer 2

终于可以解决问题了！已更新 captcha.php 文件：

<?php
    sec_session_start();
    header("Pragma: no-cache");

    generateCaptcha();
    exit();

    function generateCaptcha() {

        $captcha = 'ABCDEFGHJKLMNPQRSTUVWXYZ123456789abcdefghijkmnpqrstuvwxyz';
        $captcha = substr(str_shuffle($captcha), 0, 6);
        $_SESSION['captcha'] = $captcha;

        $font_size = 40;
        $img_height = 60;
        $img_width = 170;

        $image = imagecreate($img_width, $img_height);
        imagecolorallocate($image, 255, 255, 255);

        $text_color = imagecolorallocate($image, 0, 0, 0);
        imagettftext($image, $font_size, 0, 0, 50, $text_color, 'font/monofont.ttf', $captcha);

        header('Content-type: image/png');
        imagepng($image);

        imagedestroy($image);
    }

    function sec_session_start() {
        $session_name = 'admin_panel';
        session_name($session_name);

        $secure = false;
        $httponly = true;

        if(ini_set('session.use_only_cookies', 1) === FALSE) {
            header("Location: .../error.php?err=Could not initiate safe session");
            exit();
        }

        $cookieParams = session_get_cookie_params();
        session_set_cookie_params($cookieParams["lifetime"],
                $cookieParams["path"],
                $cookieParams["domain"],
                $secure,
                $httponly);

        session_start();
        session_regenerate_id(true);
    }
?>

验证码验证不工作

CAPTCHA verification is NOT working

php

captcha