单行 PHP 随机字符串生成器？
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One-line PHP random string generator?
提问by David Garcia
I am looking for the shortest way to generate random/unique strings and for that I was using the following two:
我正在寻找生成随机/唯一字符串的最短方法，为此我使用了以下两个：
$cClass = sha1(time());
or
或者
$cClass = md5(time());
However, I need the string to begin with an an alphabet character, I was looking at base64 encoding but that adds ==at the end and then I would need to get rid of that.
但是，我需要字符串以字母字符开头，我正在查看 base64 编码，但==在末尾添加，然后我需要摆脱它。
What would be the best way to achieve this with one line of code?
用一行代码实现这一目标的最佳方法是什么？
Update:
更新：
PRNDL came up with a good suggestions wich I ended up using it but a bit modified
PRNDL 提出了一个很好的建议，我最终使用了它，但做了一些修改
echo substr(str_shuffle(abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ),0, 1) . substr(str_shuffle(aBcEeFgHiJkLmNoPqRstUvWxYz0123456789),0, 31)
Would yield 32 characters mimicking the md5 hash but it would always product the first char an alphabet letter, like so;
会产生 32 个模仿 md5 哈希的字符，但它总是将第一个字符产生一个字母，就像这样；
However, Uoursreally improved upon and his answer;
然而，Uours确实改进了他的回答；
substr(str_shuffle("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 1).substr(md5(time()),1);
is shorter and sweeter
更短更甜
The other suggestion by Anonymous2011was very awesome but the first character for some reason would always either M, N, Y, Z so didnt fit my purposes but would have been the chosen answer, btw does anyone know why it would always yield those particular letters?
Anonymous2011的另一个建议非常棒，但出于某种原因，第一个字符总是 M、N、Y、Z，所以不符合我的目的，但会是选择的答案，顺便说一句，有人知道为什么它总是会产生那些特定的字母?
Here is the preview of my modified version
这是我修改后的版本的预览
echo rtrim(base64_encode(md5(microtime())),"=");
采纳答案by Uours
Rather than shuffling the alphabet string , it is quicker to get a single random char .
Get a single random char from the string and then append the md5( time( ) )to it . Before appending md5( time( ) )remove one char from it so as to keep the resulting string length to 32 chars :
与打乱字母表字符串相比，获得单个随机字符会更快。
从字符串中获取一个随机字符，然后将 附加md5( time( ) )到它。在追加之前md5( time( ) )从中删除一个字符，以便将结果字符串长度保持为 32 个字符：
substr("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", mt_rand(0, 51), 1).substr(md5(time()), 1);
Lowercase version :
小写版本：
substr("abcdefghijklmnopqrstuvwxyz", mt_rand(0, 25), 1).substr(md5(time()), 1);
Or even shorter and a tiny bit faster lowercase version :
或者甚至更短、更快一点的小写版本：
chr(mt_rand(97, 122)).substr(md5(time()), 1);
/* or */
chr(mt_rand(ord('a'), ord('z'))).substr(md5(time()), 1);
A note to anyone trying to generate many random strings within a second:
Sincetime( )returns time in seconds ,md5( time( ) )will be same throughout a given second-of-time due to which if many random strings were generated within a second-of-time, those probably could end up having some duplicates .
任何试图在一秒钟内生成许多随机字符串的人的注意事项：
由于time( )以秒为单位返回时间，md5( time( ) )因此在给定的第二时间中将相同，因此如果在第二时间内生成了许多随机字符串，那些可能最终可能会有一些重复。
I have tested using below code . This tests lower case version :
我已经使用下面的代码进行了测试。这测试小写版本：
$num_of_tests = 100000;
$correct = $incorrect = 0;
for( $i = 0; $i < $num_of_tests; $i++ )
{
$rand_str = substr( "abcdefghijklmnopqrstuvwxyz" ,mt_rand( 0 ,25 ) ,1 ) .substr( md5( time( ) ) ,1 );
$first_char_of_rand_str = substr( $rand_str ,0 ,1 );
if( ord( $first_char_of_rand_str ) < ord( 'a' ) or ord( $first_char_of_rand_str ) > ord( 'z' ) )
{
$incorrect++;
echo $rand_str ,'<br>';
}
else
{
$correct++;
}
}
echo 'Correct: ' ,$correct ,' . Incorrect: ' ,$incorrect ,' . Total: ' ,( $correct + $incorrect );
回答by 23kulpamens
I had found something like this:
我发现了这样的东西：
$length = 10;
$randomString = substr(str_shuffle(md5(time())),0,$length);
echo $randomString;
回答by PRNDL Development Studios
If you need it to start with a letter, you could do this. It's messy... but it's one line.
如果你需要它以字母开头，你可以这样做。它很乱……但它是一行。
$randomString = substr(str_shuffle("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 1) . substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 10);
echo $randomString;
回答by maaarghk
I decided this question needs a better answer. Like code golf! This also uses a better random byte generator.
我决定这个问题需要一个更好的答案。喜欢代码高尔夫！这也使用了更好的随机字节生成器。
preg_replace("/[\/=+]/", "", base64_encode(openssl_random_pseudo_bytes(8)));
Increase the number of bytes for a longer password, obviously.
显然，为更长的密码增加字节数。
回答by Rudie
Creates a 200 char long hexdec string:
创建一个 200 个字符长的十六进制字符串：
$string = bin2hex(openssl_random_pseudo_bytes(100));
maaarghk's answeris better though.
回答by Daniel Reyes
base_convert(microtime(true), 10, 36);
base_convert(microtime(true), 10, 36);
回答by Saud Khan
You can try this:
你可以试试这个：
function KeyGenerator($uid) {
$tmp = '';
for($z=0;$z<5;$z++) {
$tmp .= chr(rand(97,122)) . rand(0,100);
}
$tmp .= $uid;
return $tmp;
}
回答by RobAtStackOverflow
I have generated this code for you. Simple, short and (resonably) elegant.
我已经为你生成了这个代码。简单，简短且（相当）优雅。
This uses the base64 as you mentioned, if length is not important to you - However it removes the "==" using str_replace.
如果长度对您不重要，它会使用您提到的 base64 - 但是它会使用 str_replace 删除“==”。
<?php
echo str_ireplace("==", "", base64_encode(time()));
?>
回答by Emilio Gort
I use this function
我用这个功能
usage:
用法：
echo randomString(20, TRUE, TRUE, FALSE);
/**
* Generate Random String
* @param Int Length of string(50)
* @param Bool Upper Case(True,False)
* @param Bool Numbers(True,False)
* @param Bool Special Chars(True,False)
* @return String Random String
*/
function randomString($length, $uc, $n, $sc) {
$rstr='';
$source = 'abcdefghijklmnopqrstuvwxyz';
if ($uc)
$source .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
if ($n)
$source .= '1234567890';
if ($sc)
$source .= '|@#~$%()=^*+[]{}-_';
if ($length > 0) {
$rstr = "";
$length1= $length-1;
$input=array('a','b','c','d','e','f','g','h','i','j,''k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z')
$rand = array_rand($input, 1)
$source = str_split($source, 1);
for ($i = 1; $i <= $length1; $i++) {
$num = mt_rand(1, count($source));
$rstr1 .= $source[$num - 1];
$rstr = "{$rand}{$rstr1}";
}
}
return $rstr;
}
回答by user985366
It really depends on your requirements.
这真的取决于你的要求。
I needed strings to be unique between test runs, but not many other restrictions.
我需要字符串在测试运行之间是唯一的，但没有太多其他限制。
I also needed my string to start with a character, and this was good enough for my purpose.
我还需要我的字符串以一个字符开头，这对我的目的来说已经足够了。
$mystring = "/a" . microtime(true);
$mystring = "/a" . microtime(true);
Example output:
示例输出：
a1511953584.0997
a1511953584.0997
