?=-` '; $chars = str_split($chars); $ch = array(); // fill up $ch until we reach $length while(count($ch) < $length) { $n = $length - count($ch); $keys = array_rand($chars, $n > count($chars) ? count($chars) : $n); if($n == 1) { $ch[] = $chars[$keys]; break; } shuffle($keys); foreach($keys as $key) $ch[] = $chars[$key]; } $chars = $ch; return implode('', $chars); } public static function make_confusing($string) { $chars = str_split($string); foreach($chars as &$c) { if(rand(0, 2) != 0) continue; $c = mb_encode_numericentity($c, array(0, 0xffff, 0, 0xffff), 'UTF-8'); } return implode('', $chars); } public function __construct(array $salt = array()) { global $config; if(!empty($salt)) { // create a salted hash of the "extra salt" $this->salt = implode(':', $salt); } else { $this->salt = ''; } shuffle($config['spam']['hidden_input_names']); $input_count = rand($config['spam']['hidden_inputs_min'], $config['spam']['hidden_inputs_max']); $hidden_input_names_x = 0; for($x = 0; $x < $input_count ; $x++) { if($hidden_input_names_x === false || rand(0, 2) == 0) { // Use an obscure name $name = $this->randomString(rand(10, 40)); } else { // Use a pre-defined confusing name $name = $config['spam']['hidden_input_names'][$hidden_input_names_x++]; if($hidden_input_names_x >= count($config['spam']['hidden_input_names'])) $hidden_input_names_x = false; } if(rand(0, 2) == 0) { // Value must be null $this->inputs[$name] = ''; } elseif(rand(0, 4) == 0) { // Numeric value $this->inputs[$name] = (string)rand(0, 100); } else { // Obscure value $this->inputs[$name] = $this->randomString(rand(5, 100)); } } } public function html($count = false) { $elements = array( '', '', '', '', '', '', '', '', '' ); $html = ''; if($count == 0) { // all elements $inputs = array_slice($this->inputs, $this->index); } else { $inputs = array_slice($this->inputs, $this->index, $count); } $this->index += count($inputs); foreach($inputs as $name => $value) { $element = false; while(!$element) { $element = $elements[array_rand($elements)]; if(strpos($element, 'textarea') !== false && $value == '') { // There have been some issues with mobile web browsers and empty

's.
					$element = false;
				}
			}
			
			$element = str_replace('%name%', utf8tohtml($name), $element);
			
			if(rand(0, 2) == 0)
				$value = $this->make_confusing($value);
			else
				$value = utf8tohtml($value);
				
			$element = str_replace('%value%', $value, $element);
			
			$html .= $element;
		}
		
		return $html;
	}
	
	public function hash() {
		global $config;
		
		// This is the tricky part: create a hash to validate it after
		// First, sort the keys in alphabetical order (A-Z)
		$inputs = $this->inputs;
		ksort($inputs);
		
		$hash = '';
		// Iterate through each input
		foreach($inputs as $name => $value) {
			$hash .= $name . '=' . $value;
		}
		// Add a salt to the hash
		$hash .= $config['cookies']['salt'];
		
		// Use SHA1 for the hash
		return sha1($hash . $this->salt);
	}
};;

function hiddenInputs(array $salt, $print_the_rest = false) {
	global $hidden_inputs_twig;
	
	$salt_str = implode(':', $salt);
	
	if(!isset($hidden_inputs_twig[$salt_str]))
		$hidden_inputs_twig[$salt_str] = new AntiBot($salt);
	
	if($print_the_rest)
		return $hidden_inputs_twig[$salt_str]->html(0);
	else
		return $hidden_inputs_twig[$salt_str]->html(rand(1, 5));
}

function hiddenInputsHash(array $salt) {
	global $hidden_inputs_twig;
	
	$salt_str = implode(':', $salt);
	
	if(!isset($hidden_inputs_twig[$salt_str]))
		$hidden_inputs_twig[$salt_str] = new AntiBot($salt);
	
	return $hidden_inputs_twig[$salt_str]->hash();
}