Php Gd Library – Add Text To Image/merge Images

I need a simple PHP script using the GD Library to add text to an existing image plus merge two images together.

Overview:
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– Load default image
– Apply text to default image in certian areas
– Add smaller image (watermark) to current image in certian areas

Task:
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– Create a simple function/class where I would call the function to create the image.
– Some inputs would include: default image, text 1, text 2, watermark image, image format (png, jpg,…