Random Color from Input's MD5 Hash

css-color-for-string.php

<?php

/**
 * Generate a consistent* random color for a text input.
 * Consistent because it's based on MD5 hash for the input.
 * Since both MD5 and CSS colors uses hexa, a substring of the MD5 can be used.
 * Clever, huh?
 *
 * PS: you can get any substring of length 3 (for less colors) or 6 (for more colors) from your hash. Just don't
 * randomize it, or you will loose consistency.
 *
 * @param string $input
 * @return string
 */
function cssColorForString($input)
{
  return '#' . substr(md5($input), 0, 6);
}