blocks|key|632243|text|不要把它过于复杂化：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632244|$key+=+md5(microtime().rand());|code-block|syntax|javascript|632245|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Don't over-complicate it:

<pre><code>$key = md5(microtime().rand());
</code></pre>

blocks|key|848550|text|您可以使用uniqid生成唯一ID。也可以查看生成UUID+(通用唯一标识符)的PHP实现的注释。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|848551|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.uniqid.php^0|5|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can use <a href="http://php.net/manual/en/function.uniqid.php">uniqid</a> to generate unique IDs. Look at the comments for PHP implementations of UUID (universally unique identifier) generation as well.

blocks|key|632193|text|这是我在php中使用的uniq+key：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632194|$activation+=+md5(uniqid(rand(),+true));|code-block|syntax|javascript|632195|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is what I use for uniq key in php:

<pre><code>$activation = md5(uniqid(rand(), true));
</code></pre>

blocks|key|632291|text|只要使用PHP的内置函数uniqid()即可。See+PHP+manual。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|632292|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.uniqid.php^0|C|8|N|E|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Just use PHP's build-in function <code>uniqid()</code>. <a href="http://php.net/manual/en/function.uniqid.php" rel="nofollow">See PHP manual</a>.

blocks|key|632259|text|其他答案已经涵盖了创建(伪)唯一ID的主题，所以我只介绍如何设置您自己的会话id：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632260|PHP中的会话id会自动生成，但您可以设置自己的会话id。请参阅session_id()+how+to+do+it。|offset|length|style|CODE|632261|它是这样工作的：|632262|$mySessionId+=+generate_my_session_id();
$oldId+=+session_id($mySessionId);
session_start();+//+session+must+start+_after_+setting+the+id.|code-block|syntax|javascript|632263|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.session-id.php^0|0|W|C|W|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@$D|10|E|11|1|12]]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|14|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Other answers have already covered the topic about creating a (pseudo) unique ID, so I only cover how to set your own session id:

The session id in PHP gets automatically generated, but you can set your own. See <a href="http://php.net/manual/en/function.session-id.php" rel="nofollow"><code>session_id()</code></a> how to do it.

Exemplary it works like this:

<pre><code>$mySessionId = generate_my_session_id();
$oldId = session_id($mySessionId);
session_start(); // session must start _after_ setting the id.
</code></pre>

blocks|key|632218|text|我使用这个脚本随机生成密码，你改变一些东西，它将很好地工作，你想要的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632219|function+generatePassword+($length)+{
++++$possible+=+"0123456789abcdfghjkmnpqrstvwxyzABCDEFGHIJKLMNOPQRESTUVWXYZ_";+//+allowed+chars+in+the+password
+++++if+($length+==+""+OR+!is_numeric($lengh)){
++++++$length+=+8;+
+++++}

+++++srand(make_seed());

+++++$i+=+0;+
+++++$password+=+"";++++
+++++while+($i+<+$length)+{+
++++++$char+=+substr($possible,+rand(0,+strlen($possible)-1),+1);
++++++if+(!strstr($password,+$char))+{+
+++++++$password+.=+$char;
+++++++$i%2B%2B;
+++++++}
++++++}
+++++return+$password;
}|code-block|syntax|javascript|632220|对于您自己的会话密钥，它非常简单|632221|start_session();
$_SESSION['NewSessionVariable']=$VariableToSet;|632222|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I use this script to randomly generate passwords, you change a couple things around and it will work quite well for what you want.

<pre><code>function generatePassword ($length) {
 $possible = "0123456789abcdfghjkmnpqrstvwxyzABCDEFGHIJKLMNOPQRESTUVWXYZ_"; // allowed chars in the password
 if ($length == "" OR !is_numeric($lengh)){
 $length = 8; 
 }

 srand(make_seed());

 $i = 0; 
 $password = ""; 
 while ($i &lt; $length) { 
 $char = substr($possible, rand(0, strlen($possible)-1), 1);
 if (!strstr($password, $char)) { 
 $password .= $char;
 $i++;
 }
 }
 return $password;
}
</code></pre>

and for your own session key its pretty simple

<pre><code>start_session();
$_SESSION['NewSessionVariable']=$VariableToSet;
</code></pre>

blocks|key|632346|text|你可以使用我以前写的这个函数..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632347|+++function+generateToken($type+=+null)+{
++if($type)+{
++++return+'<input+type="hidden"+name="token_id"+value="'.$_SESSION['token_id'].'">';
++}+else+{
++++if(!isset($_SESSION['token_id']))+{
++++++$token_id+=+md5(substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"),+0,+10));
++++++$_SESSION['token_id']+=+$token_id;
++++++return+$_SESSION['token_id'];
++++}
++++return+$_SESSION['token_id'];
++}
}|code-block|syntax|javascript|632348|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use this function i wrote sometimes ago..

<pre><code> function generateToken($type = null) {
 if($type) {
 return '&lt;input type="hidden" name="token_id" value="'.$_SESSION['token_id'].'"&gt;';
 } else {
 if(!isset($_SESSION['token_id'])) {
 $token_id = md5(substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, 10));
 $_SESSION['token_id'] = $token_id;
 return $_SESSION['token_id'];
 }
 return $_SESSION['token_id'];
 }
}
</code></pre>

What’s the best way of generating a unique key, that can’t be guessed easily?

I would like to create a unique key for both account activation and referral purposes, that includes a checksum to help prevent users from easily guessing other users activation or referral keys.

Also, in PHP is it possible to create you own session key?
If so, how would you make this unique?

Any help is greatly appreciated.

Generate a Unique Key

生成唯一密钥的最好方法是什么，它不容易被猜中？我想为帐户激活和推荐目的创建一个唯一的密钥，其中包括一个校验和，以帮助防止用户轻松猜测其他用户激活或推荐密钥。另外，在PHP中可以创建自己的会话密钥吗？如果是这样，你会如何让它变得独一无二？任何帮助都是非常感谢的。

问生成唯一密钥
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