$keywords = file('keyword.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); $files = file('all_pages.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES); $files = array_filter($files, function($f) { return str_ends_with($f, '.php'); }); $files = array_map('trim', $files); $out = "