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__));

?>

Hello friend what would be the sequence of colors if I wanted to use

https://github.com/rdavlin/php-color-bash/blob/master/color_chart.png
https://github.com/rdavlin/php-color-bash/blob/master/bash_colors.php

when using this notation the lines are broken:

"\033[38;5;010m\033[0m"

instead of:

"\e[32m%s\e[0m"

I am looking to use a wider color palette 256 colors to create different themes.

Those strings go into sprintf, using %s placeholders to mark where the source $str should be inserted. You need to use "\033[38;5;010m%s\033[0m".
To replicate how PHP's own highlight_string outputs HTML, those strings would look like "<span style='color: black;'>%s</span>".

is it possible to change the background color of the terminal completely?

Yes: literally change the color of your terminal. Not with PHP. In the terminal's settings or options or whatever.

ok, not expected, let me keep trying on my own. thanks all the same.

the library is now ready:
https://github.com/arcanisgk/BOH-Basic-Output-Handler