gistfile1.txt

<?php
error_reporting(-1);
ini_set('display_errors',1);

$iterator = new GlobIterator('dane/*.csv', FilesystemIterator::KEY_AS_FILENAME);
$data = iterator_to_array($iterator);

$j = 0;
foreach (array_keys($data) as $file) {
	$content = file('dane/'.$file);
	for($i =1; $i < count($content); $i++) {
		$content[$i] = $file.';'.$content[$i];
	}
	if ($j > 0) {
		unset($content[0]);
	} else {
		$content[0] = 'PLIK;'.$content[0];
	}
	
	//echo $file.'<br>';
	file_put_contents('dane.csv', implode('', $content), FILE_APPEND);
	$j++;
}