“致命错误:无法重新声明<函数>" [英] &quot;Fatal error: Cannot redeclare &lt;function&gt;&quot;

问题描述

我有一个函数(这正是它的显示方式，从我的文件顶部):

I have a function(this is exactly how it appears, from the top of my file):

<?php
//dirname(getcwd());
function generate_salt()
{
    $salt = '';

    for($i = 0; $i < 19; $i++)
    {
        $salt .= chr(rand(35, 126));
    }

    return $salt;
}
...

出于某种原因，我不断收到错误消息:

And for some reason, I keep getting the error:

致命错误:无法重新声明generate_salt()(之前声明在/Applications/MAMP/htdocs/question-air/includes/functions.php:5)在/Applications/MAMP/htdocs/question-air/includes/functions.php第 13 行

Fatal error: Cannot redeclare generate_salt() (previously declared in /Applications/MAMP/htdocs/question-air/includes/functions.php:5) in /Applications/MAMP/htdocs/question-air/includes/functions.php on line 13

我无法弄清楚为什么或如何发生这样的错误.有什么想法吗?

I cannot figure out why or how such an error could occur. Any ideas?

推荐答案

此错误表示您的函数已定义；这可能意味着:

This errors says your function is already defined ; which can mean :

• 您在两个文件中定义了相同的函数
• 或者你在同一个文件的两个地方定义了相同的函数
• 或者定义函数的文件被包含两次(因此，函数似乎被定义了两次)

为了帮助解决第三点，解决方案是使用 include_once 而不是 includecode> 当包含你的 functions.php 文件时——所以它不能被包含多次.

To help with the third point, a solution would be to use include_once instead of include when including your functions.php file -- so it cannot be included more than once.

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