What common issues can arise when integrating a Captcha code into PHP code?

One common issue when integrating a Captcha code into PHP is that the Captcha may not validate correctly, causing the form submission to fail even when the user enters the correct code. This can be solved by ensuring that the Captcha code is generated and validated properly within the PHP code. 

// Generate Captcha code
$captchaCode = generateCaptchaCode();

// Validate Captcha code
if(isset($_POST['captcha']) && $_POST['captcha'] == $captchaCode){
    // Captcha validation successful, proceed with form submission
} else {
    // Captcha validation failed, display error message
    echo "Captcha validation failed. Please try again.";
}

// Function to generate Captcha code
function generateCaptchaCode(){
    // Generate random Captcha code
    $captchaCode = substr(md5(rand()), 0, 6);
    
    // Store the Captcha code in session for validation
    $_SESSION['captchaCode'] = $captchaCode;
    
    return $captchaCode;
}

Keywords

Captcha PHP integration validation error handling

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