Filter php source file and removes comments, white spaces, crlf ...Used to pack my reverse script file.-- still some minor fixes to do in the future but the main idea is implemented :)

filter.php

#!/usr/bin/env php
<?php

/**
 * Take a source file and strip all comments, spaces, crlf
 * 
 * Author: Jean-François Lefebvre
 * E-mail: lefebvre.jf@gmail.com
 * 
 */

const sourceFilename = 'reverse.php'; // --- php script filename
const targetFilename = 'reverse'; // --- target file 

$content=file_get_contents(__DIR__.'/'.$sourceFilename);

// --- extract comment blocks and remove them from source code
$commentBlocks = array_filter(token_get_all($content),
		function($item) {
			return $item[0] == T_DOC_COMMENT;
		}
);

foreach ($commentBlocks as $commentBlock) {	
	$content = str_replace($commentBlock[1], '', $content); // --- remove comment block
}		

$content = str_replace("\r", '', $content);    // --- replace with space
$content = str_replace("\n", ' ', $content);   // --- replace with space
$content = str_replace("\t", ' ', $content);   // --- replace tabs with space
$string = trim(preg_replace('/ {2,}/', ' ', $content)); // --- remove multiple spaces
$content = str_replace('<?php', PHP_EOL.'<?php ', $content); // --- add a newline and add a php start tag

file_put_contents(__DIR__.'/'.$targetFilename, $content); // --- write target file
chmod(__DIR__.'/'.$targetFilename, 0755); // --- set as executable