Graphics: DF_Captcha
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This class can be used to generate images for CAPTCHA validation.
It can generate an image with a random validation text over a noise background.
The generated image is served as the current script output in JPEG or PNG format.
The class returns the rendered text string for later validation.
It uses a configurable TrueType font to render the text. The text color, font size and rotation are also configurable parameters.
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