Why is the hexrgb() Function Undefined When Echoing $code in My CodeIgniter Captcha Controller?

Why is the hexrgb() Function Undefined When Echoing $code in My CodeIgniter Captcha Controller?

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Why is the hexrgb() Function Undefined When Echoing $code in My CodeIgniter Captcha Controller?
Why is the hexrgb() Function Undefined When Echoing $code in My CodeIgniter Captcha Controller?
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