Returns the index of the specified color in the palette of the image.
If you created the image from a file, only colors used in the image are resolved. Colors present only in the palette are not resolved.
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.
Value of red component.
Value of green component.
Value of blue component.
Returns the index of the specified color in the palette, or -1 if the color does not exist.
|8.0.0||image expects a GdImage instance now; previously, a resource was expected.|