构建数组，为什么不行？

$k="55,32,66,87,123,35,66,98,88,33,56,31,11,9,387,412,764,53,23,80,25,17"; 

$array = explode(',',$k);

print_r(array_slice($array,1,9));

settype($k,'array');

$k = "55,32,66,87,123,35,66,98,88,33,56,31,11,9,387,412,764,53,23,80,25,17";

$k = explode(',', $k, 11);

array_shift($k);

array_pop($k);

print_r($k);

//输出第2-10个数字

$k = "55,32,66,87,123,35,66,98,88,33,56,31,11,9,387,412,764,53,23,80,25,17";

$k = array_pop(array_shift(explode(',', $k, 11)));

print_r($stack);

//1 将字符串转成数组.

$k = "55,32,66,87,123,35,66,98,88,33,56,31,11,9,387,412,764,53,23,80,25,17";

$kArray = explode(',', $k);



//第二步，输出.

for($i = 1;$i<10;$i++)

{

 echo $kArray[$i];

}

$k = array(55,32,66,87,123,35,66,98,88,33,56,31,11,9,387,412,764,53,23,80,25,17);

print_r($k);