blocks|key|954124|text|如果for循环供不应求，下面是我喜欢使用的：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|954125|$s+=+substr(str_shuffle(str_repeat("0123456789abcdefghijklmnopqrstuvwxyz",+5)),+0,+5);|code-block|syntax|javascript|954126|entityMap^0|2|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If <code>for</code> loops are on short supply, here's what I like to use:

<pre><code>$s = substr(str_shuffle(str_repeat("0123456789abcdefghijklmnopqrstuvwxyz", 5)), 0, 5);
</code></pre>

blocks|key|738124|text|一种快速的方法是使用uniqid函数中最易变的字符。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|738125|例如：|738126|$rand+=+substr(uniqid('',+true),+-5);|code-block|syntax|javascript|738127|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/uniqid^0|A|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

A speedy way is to use the most volatile characters of the <a href="http://www.php.net/uniqid" rel="noreferrer">uniqid</a> function.

For example:

<pre><code>$rand = substr(uniqid('', true), -5);
</code></pre>

blocks|key|738441|text|您可以像这样简单地尝试它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|738442|$length+=+5;

$randomletter+=+substr(str_shuffle("abcdefghijklmnopqrstuvwxyz"),+0,+$length);|code-block|syntax|javascript|738443|更多细节：http://forum.arnlweb.com/viewtopic.php?f=7&t=25|offset|length|738444|entityMap|0|LINK|mutability|MUTABLE|url|http://forum.arnlweb.com/viewtopic.php?f=7&t=25^0|0|0|5|1B|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

You can try it simply like this:

<pre><code>$length = 5;

$randomletter = substr(str_shuffle("abcdefghijklmnopqrstuvwxyz"), 0, $length);
</code></pre>

more details: <a href="http://forum.arnlweb.com/viewtopic.php?f=7&amp;t=25" rel="noreferrer">http://forum.arnlweb.com/viewtopic.php?f=7&amp;t=25</a>

blocks|key|953993|text|我总是使用相同的函数，通常是用来生成密码。它很容易使用，也很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|953994|function+randPass($length,+$strength=8)+{
++++$vowels+=+'aeuy';
++++$consonants+=+'bdghjmnpqrstvz';
++++if+($strength+>=+1)+{
++++++++$consonants+.=+'BDGHJLMNPQRSTVWXZ';
++++}
++++if+($strength+>=+2)+{
++++++++$vowels+.=+"AEUY";
++++}
++++if+($strength+>=+4)+{
++++++++$consonants+.=+'23456789';
++++}
++++if+($strength+>=+8)+{
++++++++$consonants+.=+'@#$%25';
++++}

++++$password+=+'';
++++$alt+=+time()+%25+2;
++++for+($i+=+0;+$i+<+$length;+$i%2B%2B)+{
++++++++if+($alt+==+1)+{
++++++++++++$password+.=+$consonants[(rand()+%25+strlen($consonants))];
++++++++++++$alt+=+0;
++++++++}+else+{
++++++++++++$password+.=+$vowels[(rand()+%25+strlen($vowels))];
++++++++++++$alt+=+1;
++++++++}
++++}
++++return+$password;
}|code-block|syntax|javascript|953995|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|$]]

I always use the same function for this, usually to generate passwords. It's easy to use and useful.

<pre><code>function randPass($length, $strength=8) {
 $vowels = 'aeuy';
 $consonants = 'bdghjmnpqrstvz';
 if ($strength &gt;= 1) {
 $consonants .= 'BDGHJLMNPQRSTVWXZ';
 }
 if ($strength &gt;= 2) {
 $vowels .= "AEUY";
 }
 if ($strength &gt;= 4) {
 $consonants .= '23456789';
 }
 if ($strength &gt;= 8) {
 $consonants .= '@#$%';
 }

 $password = '';
 $alt = time() % 2;
 for ($i = 0; $i &lt; $length; $i++) {
 if ($alt == 1) {
 $password .= $consonants[(rand() % strlen($consonants))];
 $alt = 0;
 } else {
 $password .= $vowels[(rand() % strlen($vowels))];
 $alt = 1;
 }
 }
 return $password;
}
</code></pre>

blocks|key|954629|text|我也不知道如何做到这一点，直到我想到使用PHP数组。我非常确定这是用array生成随机字符串或数字的最简单的方法。代码如下：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|954630|function+randstr+($len=10,+$abc="aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ0123456789")+{
++++$letters+=+str_split($abc);
++++$str+=+"";
++++for+($i=0;+$i<=$len;+$i%2B%2B)+{
++++++++$str+.=+$letters[rand(0,+count($letters)-1)];
++++};
++++return+$str;
};|code-block|syntax|javascript|954631|您可以像这样使用此函数|954632|randstr(20)+++++//+returns+a+random+20+letter+string
++++++++++++++++//+Or+like+this
randstr(5,+abc)+//+returns+a+random+5+letter+string+using+the+letters+"abc"|954633|entityMap^0|Y|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

I also did not know how to do this until I thought of using PHP <code>array</code>'s. And I am pretty sure this is the simplest way of generating a random string or number with array's. The code:

<pre><code>function randstr ($len=10, $abc="aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ0123456789") {
 $letters = str_split($abc);
 $str = "";
 for ($i=0; $i&lt;=$len; $i++) {
 $str .= $letters[rand(0, count($letters)-1)];
 };
 return $str;
};
</code></pre>

You can use this function like this

<pre><code>randstr(20) // returns a random 20 letter string
 // Or like this
randstr(5, abc) // returns a random 5 letter string using the letters "abc"
</code></pre>

blocks|key|738331|text|$str+=+'';
$str_len+=+8;
for($i+=+0,+$i+<+$str_len;+$i%2B%2B){
++++//97+is+ascii+code+for+'a'+and+122+is+ascii+code+for+z
++++$str+.=+chr(rand(97,+122));
}
return+$str|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|738332|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>$str = '';
$str_len = 8;
for($i = 0, $i &lt; $str_len; $i++){
 //97 is ascii code for 'a' and 122 is ascii code for z
 $str .= chr(rand(97, 122));
}
return $str
</code></pre>

blocks|key|738276|text|如果你只能得到字母A-F，那么我的解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|738277|str_pad(dechex(mt_rand(0,+0xFFFFF)),+5,+'0',+STR_PAD_LEFT);|code-block|syntax|javascript|738278|我认为，对于像生成随机十六进制数字序列这样简单的任务来说，使用散列函数是一种夸张的做法。dechex+%2B+mt_rand将做同样的工作，但不需要不必要的加密工作。str_pad保证输出字符串的长度为5个字符(如果随机数小于0x10000)。|offset|length|style|CODE|738279|重复概率取决于mt_rand的可靠性。Mersenne+Twister以高质量的随机性而闻名，因此它应该很适合这项任务。|738280|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Mersenne_twister^0|0|0|18|6|1H|7|29|7|0|7|7|J|G|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]|$I|13|J|14|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@$I|16|J|17|K|L]]|9|@$I|18|J|19|1|1A]]|A|$]]|$1|O|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

If it's fine that you'll get only letters A-F, then here's my solution:

<pre><code>str_pad(dechex(mt_rand(0, 0xFFFFF)), 5, '0', STR_PAD_LEFT);
</code></pre>

I believe that using hash functions is an overkill for such a simple task as generating a sequence of random hexadecimal digits. <code>dechex</code> + <code>mt_rand</code> will do the same job, but without unnecessary cryptographic work. <code>str_pad</code> guarantees 5-character length of the output string (if the random number is less than 0x10000).

Duplicate probability depends on <code>mt_rand</code>'s reliability. <a href="https://en.wikipedia.org/wiki/Mersenne_twister" rel="nofollow">Mersenne Twister</a> is known for high-quality randomness, so it should fit the task well.

blocks|key|954271|text|来源：PHP+Function+that+Generates+Random+Characters|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|954272|这个简单的PHP函数适用于我：|954273|function+cvf_ps_generate_random_code($length=10)+{

+++$string+=+'';
+++//+You+can+define+your+own+characters+here.
+++$characters+=+"23456789ABCDEFHJKLMNPRTVWXYZabcdefghijklmnopqrstuvwxyz";

+++for+($p+=+0;+$p+<+$length;+$p%2B%2B)+{
+++++++$string+.=+$characters[mt_rand(0,+strlen($characters)-1)];
+++}

+++return+$string;

}|code-block|syntax|javascript|954274|用法：|954275|echo+cvf_ps_generate_random_code(5);|954276|entityMap|0|LINK|mutability|MUTABLE|url|http://carlofontanos.com/php-function-that-generates-random-characters/^0|3|19|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Source: <a href="http://carlofontanos.com/php-function-that-generates-random-characters/" rel="nofollow">PHP Function that Generates Random Characters</a>

This simple PHP function worked for me:

<pre><code>function cvf_ps_generate_random_code($length=10) {

 $string = '';
 // You can define your own characters here.
 $characters = "23456789ABCDEFHJKLMNPRTVWXYZabcdefghijklmnopqrstuvwxyz";

 for ($p = 0; $p &lt; $length; $p++) {
 $string .= $characters[mt_rand(0, strlen($characters)-1)];
 }

 return $string;

}
</code></pre>

Usage: 

<pre><code>echo cvf_ps_generate_random_code(5);
</code></pre>

blocks|key|954581|text|function+CaracteresAleatorios(+$Tamanno,+$Opciones)+{
++++$Opciones+=+empty($Opciones)+?+array(0,+1,+2)+:+$Opciones;
++++$Tamanno+=+empty($Tamanno)+?+16+:+$Tamanno;
++++$Caracteres=array("0123456789","abcdefghijklmnopqrstuvwxyz","ABCDEFGHIJKLMNOPQRSTUVWXYZ");
++++$Caracteres=+implode("",array_intersect_key($Caracteres,+array_flip($Opciones)));
++++$CantidadCaracteres=strlen($Caracteres)-1;
++++$CaracteresAleatorios='';
++++for+($k+=+0;+$k+<+$Tamanno;+$k%2B%2B)+{
++++++++$CaracteresAleatorios.=$Caracteres[rand(0,+$CantidadCaracteres)];
++++}
++++return+$CaracteresAleatorios;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|954582|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function CaracteresAleatorios( $Tamanno, $Opciones) {
 $Opciones = empty($Opciones) ? array(0, 1, 2) : $Opciones;
 $Tamanno = empty($Tamanno) ? 16 : $Tamanno;
 $Caracteres=array("0123456789","abcdefghijklmnopqrstuvwxyz","ABCDEFGHIJKLMNOPQRSTUVWXYZ");
 $Caracteres= implode("",array_intersect_key($Caracteres, array_flip($Opciones)));
 $CantidadCaracteres=strlen($Caracteres)-1;
 $CaracteresAleatorios='';
 for ($k = 0; $k &lt; $Tamanno; $k++) {
 $CaracteresAleatorios.=$Caracteres[rand(0, $CantidadCaracteres)];
 }
 return $CaracteresAleatorios;
}
</code></pre>

blocks|key|954353|text|我一直在用这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|954354|<?php+function+fRand($len)+{
++++$str+=+'';
++++$a+=+"abcdefghijklmnopqrstuvwxyz0123456789";
++++$b+=+str_split($a);
++++for+($i=1;+$i+<=+$len+;+$i%2B%2B)+{+
++++++++$str+.=+$b[rand(0,strlen($a)-1)];
++++}
++++return+$str;
}+?>|code-block|syntax|javascript|954355|当你调用它时，设置字符串的长度。|954356|<?php+echo+fRand([LENGHT]);+?>|954357|您还可以更改字符串$a中可能的字符。|offset|length|style|CODE|954358|entityMap^0|0|0|0|0|9|2|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I`ve aways use this:

<pre><code>&lt;?php function fRand($len) {
 $str = '';
 $a = "abcdefghijklmnopqrstuvwxyz0123456789";
 $b = str_split($a);
 for ($i=1; $i &lt;= $len ; $i++) { 
 $str .= $b[rand(0,strlen($a)-1)];
 }
 return $str;
} ?&gt;
</code></pre>

When you call it, sets the lenght of string.

<pre><code>&lt;?php echo fRand([LENGHT]); ?&gt;
</code></pre>

You can also change the possible characters in the string <code>$a</code>.

blocks|key|738700|text|包含特殊字符的简单一行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|738701|echo+implode("",+array_map(function()+{return+chr(mt_rand(33,126));},+array_fill(0,5,null)));|code-block|syntax|javascript|738702|基本上，它用空值填充长度为5的数组，并用ascii-range中的随机符号替换每个值，最后将它们连接成一个字符串。|738703|使用第二个array_fill参数来控制长度。|offset|length|style|CODE|738704|它使用33到126的ASCII表范围，包括以下字符：|738705|!"#$%25&'()*%2B,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]%5E_`abcdefghijklmnopqrstuvwxyz{%7C}~|738706|entityMap^0|0|0|0|5|A|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Simple one liner which includes special characters:
<pre><code>echo implode(&quot;&quot;, array_map(function() {return chr(mt_rand(33,126));}, array_fill(0,5,null)));
</code></pre>
Basically, it fills an array with length 5 with null values and replaces each value with a random symbol from the ascii-range and as the last, it joins them together t a string.
Use the 2nd <code>array_fill</code> parameter to control the length.
It uses the ASCII Table range of 33 to 126 which includes the following characters:
<pre><code>!&quot;#$%&amp;'()*+,-./0123456789:;&lt;=&gt;?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
</code></pre>

I want to create exact 5 random characters string with least possibility of getting duplicated. What would be the best way to do it? Thanks.

Generate random 5 characters string

我想创建精确的5个随机字符字符串与最小的可能性得到复制。最好的方法是什么？谢谢。

问随机生成5个字符的字符串
EN

回答 11

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问随机生成5个字符的字符串EN

回答 11

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问随机生成5个字符的字符串
EN