Strings Php

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  4. Using sprintf() to ensure that one digit hex numbers (like 0) get padded with a leading 0
function build_color($red, $green, $blue) {
    $redhex   = dechex($red);
    $greenhex = dechex($green);
    $bluehex  = dechex($blue);
    return sprintf('#%02s%02s%02s', $redhex, $greenhex, $bluehex);
}