List all colors in css file

colorlist.php

<?php

//needs to be expanded to include #fff and also needs to be more robust, but it's a start

$colorsString = shell_exec("grep -o -h '#......;' ./style.css | tr [A-Z] [a-z] | sort | uniq");

$colors = array_filter(explode("\n", str_replace(array('#', ';'), '', $colorsString)));

header("Content-Type: image/png");
$im = @imagecreate(210, 20 * count($colors))
    or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 255, 255, 255);
$text_color = imagecolorallocate($im, 0, 0, 0);

$allocatedColors = array();
foreach ($colors as $idx => $color) {
  $allocatedColors[$color] = imagecolorallocate($im, hexdec(substr($color, 0, 2)), hexdec(substr($color, 2, 2)), hexdec(substr($color, 4, 2)));
  imagefilledrectangle($im, 0, $idx * 20, 110, ($idx * 20) + 20, $allocatedColors[$color]);
  imagestring($im, 2, 115, ($idx * 20) + 2,  "#$color;", $text_color);
}

//$text_color = imagecolorallocate($im, 233, 14, 91);
//imagestring($im, 1, 5, 5,  "A Simple Text String", $text_color);
imagepng($im);
imagedestroy($im);