PHP How can I get HEX Color code from array of R + G + B?

Question

I have an array:

Array
(
    [red] => 252
    [green] => 168
    [blue] => 166
    [alpha] => 0
)

It's an output of function imagecolorsforindex.
How can I get a HTML code from these elements? For example: #99CCFF

Answer 1

Strictly speaking you can't, since alpha is not supported. But since the alpha is 0, we can assume that it won't matter. As such, pass each value into sprintf() with a format specifier of %02x for each element.

c = sprintf('#%02x%02x%02x', val['red'], val['green'], val['blue']);

Answer 2

PHP Convert RGB from/to HTML hex color

rgb2html($array[0], $array[1], $array[2])