php 注意：未定义偏移量：2
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Notice: Undefined offset: 2
提问by Anuwa
I'm new to php and I have done an example in php book. In there I got below notice. How to prevent this notice ?
我是 php 新手，我在 php 书中做了一个例子。在那里我得到了下面notice。如何防止此通知？
<?php
require_once('AddingMachine.php');
$arrayofnumbers = array(100,200);
$objectname = new AddingMachine();
$objectname->addNumbers($arrayofnumbers);
?>
and
和
<?php
Class AddingMachine
{
private $total = 0;
function addNumbers(array $numbers)
{{
for($i=0;$i<=sizeof($numbers);$i++)
{
$this->total = $this->total + $numbers[$i];
}
echo $this->total;
}
}
}
回答by Rikesh
Change your loop from
改变你的循环
for($i=0; $i <= sizeof($numbers); $i++)
to
到
for($i=0; $i < sizeof($numbers); $i++)
Also preferable to use count.
也最好使用count.
for($i=0; $i < count($numbers); $i++)
回答by ATaylor
The problem is with the <= sizeof($numbers)(which is equal to count($numbers). It will give you the total count of array elements, which is always one more than the maximum index, because arrays begin counting at 0.
问题在于<= sizeof($numbers)( 等于count($numbers)。它会给你数组元素的总数，它总是比最大索引多 1，因为数组从 0 开始计数。
Simply replace the <=with <and you'll be fine.
只需更换<=用<，你会没事的。
