我试图在PHP中创建一个随机字符串，我得到绝对没有输出:
<?php
function RandomString()
{
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randstring = '';
for ($i = 0; $i < 10; $i++) {
$randstring = $characters[rand(0, strlen($characters))];
}
return $randstring;
}
RandomString();
echo $randstring;
我做错了什么?
当前回答
function strgen($len) {
$buf = '';
for ($i = 0; $i < $len; $i++) {
$j = mt_rand(0, 61);
if ($j >= 36) {
$j += 13;
} else if ($j >= 10) {
$j += 7;
}
$buf .= chr(48 + $j);
}
return $buf;
}
简单而优雅。
其他回答
这是另一个解决方案。
function genRandomString($length = 10)
{
if($length < 1)
$length = 1;
return substr(preg_replace("/[^A-Za-z0-9]/", '', base64_encode(openssl_random_pseudo_bytes($length * 2))), 0, $length);
}
PS.我在Ubuntu上使用PHP 7.2。
function rndStr($len = 64) {
$randomData = file_get_contents('/dev/urandom', false, null, 0, $len) . uniqid(mt_rand(), true);
$str = substr(str_replace(array('/','=','+'),'', base64_encode($randomData)),0,$len);
return $str;
}
Laravel 5框架中的辅助函数
/**
* Generate a "random" alpha-numeric string.
*
* Should not be considered sufficient for cryptography, etc.
*
* @param int $length
* @return string
*/
function str_random($length = 16)
{
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
return substr(str_shuffle(str_repeat($pool, $length)), 0, $length);
}
在PHP中生成随机字符串的另一种方法是:
function RandomString($length) {
$original_string = array_merge(range(0,9), range('a','z'), range('A', 'Z'));
$original_string = implode("", $original_string);
return substr(str_shuffle($original_string), 0, $length);
}
echo RandomString(6);
function randomString() {
return md5(rand(100, 200));
}
