1 function demo($num){ 2 echo $num."<br>"; 3 4 if($num>0) 5 demo($num-1); 6 else 7 echo "--------------------<br>"; 8 9 echo $num."<br>";10 }11 12 demo(10);
即输出 10 9 8 7 6 5 4 3 2 1 0