Use of php array_slice function and detailed explanation of parameters

<?php 
/* 
用手册上的例子 
*/ 
$input = array ("a", "b", "c", "d", "e"); 
$output = array_slice ($input, 2); // returns "c", "d", and "e", 
$output = array_slice ($input, 2, -1); // returns "c", "d" 
$output = array_slice ($input, -2, 1); // returns "d" 
$output = array_slice ($input, 0, 3); // returns "a", "b", and "c" 
?>

The key point is that length is negative. It means taking the array until it is as far away as length from the end of the array

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