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Operation color darkening PHP class

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Operation color darkening PHP class

<?php
function ColorDarken($color, $dif=20){
  $color = str_replace('#', '', $color);
  if (strlen($color) != 6){ return '000000'; }
  $rgb = '';
  for ($x=0;$x<3;$x++){
    $c = hexdec(substr($color,(2*$x),2)) - $dif;
    $c = ($c < 0) ? 0 : dechex($c);
    $rgb .= (strlen($c) < 2) ? '0'.$c : $c;
  }
  return '#'.$rgb;
}
//范例：
for ($x=1; $x < 20; $x++){
  // Start color:
  $c = ColorDarken('#FF481D', ($x * 3));
  print "<div style='background-color: $c; color: $c; font-size: 50%; padding: 0px;'>.</div>\n";
}
?>

This is a PHP class for operating the color to become darker. Friends who need it can download it and use it.

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