imagesetthickness

Set the thickness for line drawing (PHP 4 >= 4.0.6, PHP 5)
bool imagesetthickness ( resource image, int thickness )

imagesetthickness() sets the thickness of the lines drawn when drawing rectangles, polygons, ellipses etc. etc. to thickness pixels.

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
thickness

Returns TRUE on success or FALSE on failure.

Note:

This function requires GD 2.0.1 or later (2.0.28 or later is recommended).

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