Mix 2 hexadecimal colours with strength control. Code credit: http://www.syndrotech.com/programming/php-mix-two-hex-colors/

gistfile1.php

<?php
     function mixColors($color1, $color2, $strength = 0.5) {
          $strengthOppose = 1 - $strength;

          $color1_red   = hexdec(substr($color1, 0, 2));
          $color1_green = hexdec(substr($color1, 2, 2));
          $color1_blue  = hexdec(substr($color1, 4, 2));

          $color2_red   = hexdec(substr($color2, 0, 2));
          $color2_green = hexdec(substr($color2, 2, 2));
          $color2_blue  = hexdec(substr($color2, 4, 2));

          $newcolor_red   = round(($color1_red * $strengthOppose) + ($color2_red * $strength));
          $newcolor_green = round(($color1_green * $strengthOppose) + ($color2_green * $strength));
          $newcolor_blue  = round(($color1_blue * $strengthOppose) + ($color2_blue * $strength));

          return str_pad(dechex($newcolor_red), 2, '0', STR_PAD_LEFT).str_pad(dechex($newcolor_green), 2, '0', STR_PAD_LEFT).str_pad(dechex($newcolor_blue), 2, '0', STR_PAD_LEFT);
     }

     $color1 = "FF0000";
     $color2 = "ffffff";

     echo( '#' . mixColors($color1, $color2, 0.3) );
?>

I was googling stuff about my old website Syndrotech that I made years ago. How fun to find something like this!

Unfortunately, 15-year-old me got bored of that website I had put so much work into, so I stopped paying for it, and then I accidentally deleted the backups that I had laying around afterwards :( All that I have left are a few things like this!