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<?php

function hexrgb($hexstr) {

	//this "if" is optional if you wont use three character format
    if(strlen($hexstr) < 6){
    	$hexstr = str_repeat($hexstr[0],2) . str_repeat($hexstr[1],2) . str_repeat($hexstr[2],2);
    }

    $int = hexdec($hexstr);

    return array("red" => 0xFF & ($int >> 0x10), "green" => 0xFF & ($int >> 0x8), "blue" => 0xFF & $int);
}

print_r(hexrgb("00f"));