php 简单函数中的未定义偏移量()
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php Undefined Offset in simple function()
提问by OldWest
I'm not sure why I am getting an Undefined Offset Noticeon this:
我不知道为什么我会收到一个未定义的偏移通知:
<?php
$numbers = array('1','2','3');
$total = 0;
for($i=0;$i<=sizeof($numbers); $i++) {
$total += $numbers[$i];
echo $total;
}
?>
Output:
输出:
136 Notice: Undefined offset: 3 in E:\php\arrays\array_1.php on line 176
136 注意:未定义的偏移量:3 in E:\php\arrays\array_1.php on line 176
回答by Paul Dixon
Your array has three elements at index 0, 1 and 2. There is no element with index 3.
您的数组在索引 0、1 和 2 处有三个元素。没有索引为 3 的元素。
Your loop should stop before it hits that...
你的循环应该在它到达之前停止......
for($i=0;$i<sizeof($numbers); $i++) {
}
Also, checkout array_sum, which might be what you're wanting anyway...
此外,结帐array_sum,这可能是你想要的东西......
$total=array_sum($numbers);
回答by Dogbert
You should loop to <
the size of the array, not <=
.
您应该循环到<
数组的大小,而不是<=
.
for($i=0;$i<sizeof($numbers); $i++) {
回答by wanovak
Change your condition from <=
to <
.
将您的条件从 更改<=
为<
。
This will add properly:
这将正确添加:
$total += intval($numbers[$i]);
回答by Vaibs
turnoff html errors
关闭 html 错误
error_reporting(E_ALL);
ini_set('display_errors', 'On');
ini_set('html_errors', 'Off');