_color_pack: define variable before using
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@ -216,6 +216,7 @@ function _color_unpack($hex, $normalize = false) {
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### Convert an RGB triplet to a hex color.
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function _color_pack($rgb, $normalize = false) {
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$out = 0;
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foreach ($rgb as $k => $v) {
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$out |= (($v * ($normalize ? 255 : 1)) << (16 - $k * 8));
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}return '#'. str_pad(dechex($out), 6, 0, STR_PAD_LEFT);
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