How can session management be optimized to prevent the CAPTCHA value from being overwritten in PHP?

To prevent the CAPTCHA value from being overwritten in PHP, session management can be optimized by storing the CAPTCHA value in a separate session variable and ensuring that it is not overwritten by other session data. 

// Start the session
session_start();

// Set CAPTCHA value in a separate session variable
$_SESSION['captcha_value'] = generate_captcha();

// Function to generate CAPTCHA value
function generate_captcha() {
    // Generate CAPTCHA value logic here
}

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