What are the potential drawbacks of using a Rechen-Captcha as a form of Captcha in PHP?

One potential drawback of using a Rechen-Captcha in PHP is that it may not be user-friendly for individuals with visual impairments or learning disabilities. To address this issue, you can provide an alternative method for users to verify their identity, such as an audio-based Captcha. 

// Implementing an audio-based Captcha as an alternative method for users with visual impairments
if ($user_has_visual_impairment) {
    // Generate audio-based Captcha code
    $audio_captcha_code = generate_audio_captcha();
    
    // Output audio Captcha code to user
    echo "Please listen to the following code and enter it: $audio_captcha_code";
} else {
    // Generate Rechen-Captcha code
    $rechen_captcha_code = generate_rechen_captcha();
    
    // Output Rechen-Captcha code to user
    echo "Please solve the following math problem: $rechen_captcha_code";
}

Keywords

Rechen-Captcha Captcha PHP drawbacks security

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