$string = json_encode($myvar);
$var = array(
	'pozdrav',
	433,
	array(1,'niz u nizu'),
	'prvi niz'
);
$nova_var = json_decode($string);
print_r($nova_var) . "<br>";
echo $nova_var[0] . "<br>";
echo $nova_var[2][1] . "<br>";