我试图在PHP中创建一个随机字符串，但我完全没有得到以下输出:
<?php
function RandomString()
{
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randstring = '';
for ($i = 0; $i < 10; $i++) {
$randstring = $characters[rand(0, strlen($characters))];
}
return $randstring;
}
RandomString();
echo $randstring;
我做错了什么？
要具体回答这个问题，有两个问题:
$randstring不在范围内.以下是带有更正的代码片段:
function generateRandomString($length = 10) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$charactersLength = strlen($characters);
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, $charactersLength - 1)];
}
return $randomString;
}
使用下面的调用输出随机字符串:
// 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, 100.