php如何截取数组中前几位的元素

<?php
header('content-type:text/html;charset=utf-8');   
$arr=array(1,2,3,4,5,6,7,8,9,10);

echo "截取数组前5位的元素代码：";
$result = array_slice($arr,0,5); 
var_dump($result);

echo "截取数组前3位的元素代码：";
$result = array_slice($arr,0,3);
var_dump($result);
?>