imagecolorresolvealpha

Get the index of the specified color + alpha or its closest possible alternative (PHP 4 >= 4.0.6, PHP 5)
int imagecolorresolvealpha ( resource image, int red, int green, int blue, int alpha )

This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red: Value of red component
green: Value of green component
blue: Value of blue component
alpha: A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

Returns a color index.

Note:

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

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