PHP数组键值07和放大器举止异常; 08 [英] php array behaving strangely with key value 07 & 08

问题描述

我有个数组

$months[01] = 'January';
$months[02] = 'February';
$months[03] = 'March';
$months[04] = 'April';
$months[05] = 'May';
$months[06] = 'June';
$months[07] = 'July';
$months[08] = 'August';
$months[09] = 'September';
$months[10] = 'October';
$months[11] = 'November';
$months[12] = 'December';

现在阵确实为关键 07 ＆放大器输出不正确的值; 08 。

Now the array does not output correct value for key 07 & 08.

试着做的print_r（$个月）你不会得到任何键值月和零关键指标月。

Try doing print_r($months) you will not get any key value August and zero key index for September.

虽然我能够通过删除前导零来解决这个问题，我仍然很想知道同样的原因。

Though I’m able to solve the problem by removing the leading zero, still I would love to know the reason for same.

即使是PHP编辑器插播一些问题，但无法分辨是什么问题。

Even the PHP editor spots some problem but unable to tell what is the problem.

感谢

推荐答案

若干前prepending 0意味着PHP解析它作为在prepending 0X导致其解析为同样的方式一个八进制值十六进制值。取出零，它会正常工作。

Prepending 0 before a number means PHP parses it as an octal value in the same way that prepending 0x causes it to be parsed as a hexadecimal value. Remove the zero, and it will work fine.

echo 07; // prints 7
echo 010; // prints 8

指定UNIX权限时，这主要用于：

This is mostly used when specifying unix permissions:

chmod("myfile", 0660);

除了它的很少的东西，你想要做的事。

Except for that it's rarely something that you'd want to do.

这是在 PHP手册描述。

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