Quick PHP code highlighter

highlight_string_ex.php

<?php

function highlight_string_ex($string) {
	static $COLORS = [
		"comment" => "\e[32m%s\e[0m", // green
		"constant" => "\e[93m%s\e[0m", // yellow
		"function" => "\e[97m%s\e[0m", // white
		"keyword" => "\e[94m%s\e[0m", // blue
		"magic" => "\e[93m%s\e[0m", // yellow
		"string" => "\e[95m%s\e[0m", // magenta
		"tag" => "\e[94m%s\e[0m", // blue
		"variable" => "\e[36m%s\e[0m", // cyan
		"" => "%s",
	];
	static $TOKENS = [
		T_AS => "as",
		T_CLOSE_TAG => "tag",
		T_COMMENT => "comment",
		T_CONCAT_EQUAL => "",
		T_CONSTANT_ENCAPSED_STRING => "string",
		T_CONTINUE => "keyword",
		T_DOUBLE_ARROW => "",
		T_ECHO => "keyword",
		T_ELSE => "keyword",
		T_FILE => "magic",
		T_FOREACH => "keyword",
		T_FUNCTION => "keyword",
		T_IF => "keyword",
		T_IS_EQUAL => "",
		T_ISSET => "keyword",
		T_LIST => "keyword",
		T_OPEN_TAG => "tag",
		T_RETURN => "keyword",
		T_STATIC => "keyword",
		T_VARIABLE => "variable",
		T_WHITESPACE => "",
	];

	$output = "";
	foreach (token_get_all($string) as $token) {
		if (is_string($token)) {
			// plain string
			$output .= $token;
			continue;
		}

		list($t, $str) = $token;
		
		if ($t == T_STRING) {
			// T_STRING represents constants and other names
			if (function_exists($str)) {
				$output .= sprintf($COLORS["function"], $str);
			} else if (defined($str)) {
				$output .= sprintf($COLORS["constant"], $str);
			} else {
				$output .= $str;
			}
		} else if (isset($TOKENS[$t])) {
			$output .= sprintf($COLORS[$TOKENS[$t]], $str);
		} else {
			// $output .= $str;
			$output .= sprintf("<%s '%s'>", token_name($t), $str);
		}
	}
	return $output;
}

echo highlight_string_ex(file_get_contents(__FILE__));

?>