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1/**
2* $system_id - your project system ID (number)
3* $version - callback or API version
4* $args - array with API method or callback parameters. API parameters list you can find in API method description
5* $system_key - your system key
6*/
7function getSignature($system_id, $version, array $args, $system_key){
8		$md5 = array();
9				$md5[] = $system_id;
10				$md5[] = $version;
11				foreach ($args as $required_arg) {
12						$arg = $required_arg;
13						if(is_array($arg)){
14								if(count($arg)) {
15										$recursive_arg = '';
16										array_walk_recursive($arg, function($item) use (& $recursive_arg) { if(!is_array($item)) { $recursive_arg .= ($item . ':');} });
17										$md5[] = substr($recursive_arg, 0, strlen($recursive_arg)-1); // get rid of last colon-sign
18								} else {
19								$md5[] = '';
20								}
21						} else {
22				$md5[] = $arg;
23				}
24		};
25		$md5[] = $system_key;
26		$md5_str = implode('*', $md5);
27		$md5 = md5($md5_str);
28		return $md5;
29}