/* initvar()
 * Initialize variables 
 */ 
function initvar() {
	foreach( func_get_args() as $v )
	{
		if( is_array( $v ) )
		{
			while( list( $key, $value ) = each( $v ) )
			{
			$GLOBALS[$key] = ( !isset($GLOBALS[$key]) ? $value : $GLOBALS[$key] );
			}
		}
		else
		{
			$GLOBALS[$v] = ( !isset($GLOBALS[$v]) ? '' : $GLOBALS[$v] );
		}
	}
}

http://www.digitalamit.com/article/initvar/2.phtml

Credit goes to Amit Arora

Initializing Variables in PHP

PHP