/functions.php

<?
// Global functionality
// should be included on every page

session_start();

$user = $_COOKIE['noht_user_hash'] ? $_COOKIE['noht_user_hash'] : setHashCookie();
$new_user;

$a_year = time()+(60*60*24*365);

function setHashCookie() {
	$cookie = sha1(time().str_replace(".", $_SERVER['REMOTE_ADDR']));
	setcookie("noht_user_hash", $cookie, $a_year);
	
	global $new_user;
	$new_user = true;
	
	return $cookie;
}

$title = "Noht. sharing drawings. A simple HTML5 mobile canvas drawing, social sharing, application";

function alphaID($in, $to_num = false, $pad_up = false, $passKey = null) {

  $index = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  if ($passKey !== null) {
    // Although this function's purpose is to just make the
    // ID short - and not so much secure,
    // with this patch by Simon Franz (http://blog.snaky.org/)
    // you can optionally supply a password to make it harder
    // to calculate the corresponding numeric ID
 
    for ($n = 0; $n<strlen($index); $n++) {
      $i[] = substr( $index,$n ,1);
    }
 
    $passhash = hash('sha256',$passKey);
    $passhash = (strlen($passhash) < strlen($index))
      ? hash('sha512',$passKey)
      : $passhash;
 
    for ($n=0; $n < strlen($index); $n++) {
      $p[] =  substr($passhash, $n ,1);
    }
 
    array_multisort($p,  SORT_DESC, $i);
    $index = implode($i);
  }
 
  $base  = strlen($index);
 
  if ($to_num) {
    // Digital number  <<--  alphabet letter code
    $in  = strrev($in);
    $out = 0;
    $len = strlen($in) - 1;
    for ($t = 0; $t <= $len; $t++) {
      $bcpow = bcpow($base, $len - $t);
      $out   = $out + strpos($index, substr($in, $t, 1)) * $bcpow;
    }
 
    if (is_numeric($pad_up)) {
      $pad_up--;
      if ($pad_up > 0) {
        $out -= pow($base, $pad_up);
      }
    }
    $out = sprintf('%F', $out);
    $out = substr($out, 0, strpos($out, '.'));
  } else {
    // Digital number  -->>  alphabet letter code
    if (is_numeric($pad_up)) {
      $pad_up--;
      if ($pad_up > 0) {
        $in += pow($base, $pad_up);
      }
    }
 
    $out = "";
    for ($t = floor(log($in, $base)); $t >= 0; $t--) {
      $bcp = bcpow($base, $t);
      $a   = floor($in / $bcp) % $base;
      $out = $out . substr($index, $a, 1);
      $in  = $in - ($a * $bcp);
    }
    $out = strrev($out); // reverse
  }
 
  return $out;
}

$colors = array(
	"black" 	=> array("hex" => "000", "rgb" => array("r" => 0, "g" => 0, "b" => 0)),
	"white" => array("hex" => "fff", "rgb" => array("r" => 255, "g" => 255, "b" => 255)),
	"blue" => array("hex" => "6cf", "rgb" => array("r" => 102, "g" => 204, "b" => 255)),
	"red" => array("hex" => "d6012a", "rgb" => array("r" => 214, "g" => 1, "b" => 42)),
	"orange" => array("hex" => "e36731", "rgb" => array("r" => 227, "g" => 103, "b" => 49)),
	"yellow" => array("hex" => "dbce0a", "rgb" => array("r" => 219, "g" => 206, "b" => 10)),
	"green" => array("hex" => "4a6e00", "rgb" => array("r" => 74, "g" => 110, "b" => 0)),
	"purple" => array("hex" => "503662", "rgb" => array("r" => 80, "g" => 54, "b" => 98)),
	"pink" => array("hex" => "da6aa5", "rgb" => array("r" => 218, "g" => 106, "b" => 165)),
);

function timeAgo($time) {

	$time = time() - $time; // to get the time since that moment
		
	$tokens = array (
			31536000 => 'year',
			2592000 => 'month',
			604800 => 'week',
			86400 => 'day',
			3600 => 'hour',
			60 => 'minute',
			1 => 'second'
	);

	foreach ($tokens as $unit => $text) {
		if ($time < $unit) continue;
		$numberOfUnits = floor($time / $unit);
		return $numberOfUnits.' '.$text.(($numberOfUnits>1)?'s':'').' ago';
	}

}

function deviceCheck() {
	
	if( stristr($_SERVER['HTTP_USER_AGENT'],'ipad') ) {
		$device = "ipad";
	} else if( stristr($_SERVER['HTTP_USER_AGENT'],'iphone') || strstr($_SERVER['HTTP_USER_AGENT'],'iphone') ) {
		$device = "iphone";
	} else if( stristr($_SERVER['HTTP_USER_AGENT'],'blackberry') ) {
		$device = "blackberry";
	} else if( stristr($_SERVER['HTTP_USER_AGENT'],'android') ) {
		$device = "android";
	}

	return ($device) ? $device : false;
}

$device = deviceCheck();

?>