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recursively remove empty, null etc. array elements
[php functions]

// recursively remove empty, null etc. array elements
function array_filter_recursive($input) 
{ 
	if (is_array($input)) {
		foreach ($input as &$value) { 
			if (is_array($value) || (is_null($value) || $value=="")) { 
				$value = array_filter_recursive($value); 
			} 
		} 
	}
	
	if (is_array($input)) return array_filter($input); 
}