PHP随机字符串生成器

问题描述

我正在尝试在PHP中创建一个随机字符串，并且我绝对不会得到任何输出:

I'm trying to create a randomized string in PHP, and I get absolutely no output with this:

<?php
    function RandomString()
    {
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $randstring = '';
        for ($i = 0; $i < 10; $i++) {
            $randstring = $characters[rand(0, strlen($characters))];
        }
        return $randstring;
    }

    RandomString();
    echo $randstring;

我在做什么错了?

推荐答案

要专门回答此问题，有两个问题:

To answer this question specifically, two problems:

回显
1. $randstring不在范围内.
2. 这些字符在循环中没有并置在一起.

1. $randstring is not in scope when you echo it.
2. The characters are not getting concatenated together in the loop.

这是一个包含以下更正的代码段:

Here's a code snippet with the corrections:

function generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

通过以下调用输出随机字符串:

Output the random string with the call below:

// Echo the random string.
// Optionally, you can give it a desired string length.
echo generateRandomString();

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