In what ways can storing Captcha solutions client-side impact user experience and security in PHP applications?

Storing Captcha solutions client-side can impact user experience and security in PHP applications as it exposes the solution to potential manipulation by malicious users. To mitigate this risk, it is recommended to generate and validate Captcha solutions server-side to ensure their integrity. 

// Server-side Captcha generation and validation
$randomString = substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 6);
$captchaHash = password_hash($randomString, PASSWORD_DEFAULT);

// Store $captchaHash in session or database

// Validate Captcha solution
if (isset($_POST['captcha_solution'])) {
    $captchaSolution = $_POST['captcha_solution'];
    if (password_verify($captchaSolution, $captchaHash)) {
        // Captcha solution is valid
    } else {
        // Captcha solution is invalid
    }
}

Keywords

Captcha client-side storage user experience security PHP applications

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