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   1. drupal6
   2. drupal7

Convert an RGB triplet to a hex color.

Code

modules/color/color.module, line 615

<?php
function _color_pack($rgb, $normalize = false) {
  $out = 0;
  foreach ($rgb as $k => $v) {
    $out |= (($v * ($normalize ? 255 : 1)) << (16 - $k * 8));
  }
  return '#' . str_pad(dechex($out), 6, 0, STR_PAD_LEFT);
}
?>