10.24 2010-12-04 22:56 采纳率: 0%
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Php 随机字符串生成器

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;

What am I doing wrong?

转载于:https://stackoverflow.com/questions/4356289/php-random-string-generator

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30条回答 默认 最新

  • 喵-见缝插针 2010-12-04 22:57
    关注

    To answer this question specifically, two problems:

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

    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;
    }
    

    Output the random string with the call below:

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

    Please note that this generates predictable random strings. If you want to create secure tokens, see this answer.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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