求大神帮忙，这个改怎么处理，php数组组合

$a = array(10,11,12,13);$b = array(14,15);foreach(Descartes($a, $b) as $v) $r[] = join(',', $v);echo join('|', $r);

  function Descartes($d) {	if(func_num_args() > 1) $d = func_get_args();	$r = array_pop($d);	while($d) {		$t = array();		$s = array_pop($d);		if(! is_array($s)) $s = array($s);		foreach($s as $x) {			foreach($r as $y) $t[] = array_merge(array($x), is_array($y) ? $y : array($y));		}		$r = $t;	}	return $r;  }

$a = array(10,11,12,13);$b = array(14,15);foreach(Descartes($a, $b) as $v) $r[] = join(',', $v);echo join('|', $r);

  function Descartes($d) {	if(func_num_args() > 1) $d = func_get_args();	$r = array_pop($d);	while($d) {		$t = array();		$s = array_pop($d);		if(! is_array($s)) $s = array($s);		foreach($s as $x) {			foreach($r as $y) $t[] = array_merge(array($x), is_array($y) ? $y : array($y));		}		$r = $t;	}	return $r;  }