PHP/Graphics Image/imagecolorexact

Color-retrieval functions could be combined into a custom function

 
<?php
    function getcolor($img, $red, $green, $blue) {
        $color = imagecolorexact($img, $red, $green, $blue);
        if($color == -1) {
            $color = imagecolorallocate($img, $red, $green, $blue);
            if($color == -1) {
                $color = imagecolorclosest($img, $red, $green, $blue);
            }
        }
        return $color;
    }
?>