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Question,

is there a special function to get a random color.

I don't know of a special function,
but this is a function I use.

function random_color()
{
$r=rand(128,255);
$g=rand(128,255);
$b=rand(128,255);
$color=dechex($r).dechex($g).dechex($b);
return "#".$color;
}