blocks|key|5195080|text|首先，使用所有可能的字符创建一个字符串：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5195081|+$characters+=+'abcdefghijklmnopqrstuvwxyz0123456789';|code-block|syntax|javascript|5195082|您还可以使用range()更快地完成此操作。|offset|length|5195083|然后，在循环中，选择一个随机数并将其用作$characters字符串的索引，以获取随机字符，并将其附加到字符串中：|style|CODE|5195084|+$string+=+'';
+$max+=+strlen($characters)+-+1;
+for+($i+=+0;+$i+<+$random_string_length;+$i%2B%2B)+{
++++++$string+.=+$characters[mt_rand(0,+$max)];
+}|5195085|$random_string_length是随机字符串的长度。|5195086|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/range^0|0|0|6|7|0|0|K|B|0|0|0|L|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@$I|13|J|14|1|15]]|A|$]]|$1|K|3|L|5|6|7|16|8|@$I|17|J|18|M|N]]|9|@]|A|$]]|$1|O|3|P|5|D|7|19|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|1A|8|@$I|1B|J|1C|M|N]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

First make a string with all your possible characters:

<pre><code> $characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
</code></pre>

You could also use <a href="http://php.net/range" rel="noreferrer">range()</a> to do this more quickly.

Then, in a loop, choose a random number and use it as the index to the <code>$characters</code> string to get a random character, and append it to your string:

<pre><code> $string = '';
 $max = strlen($characters) - 1;
 for ($i = 0; $i &lt; $random_string_length; $i++) {
 $string .= $characters[mt_rand(0, $max)];
 }
</code></pre>

<code>$random_string_length</code> is the length of the random string.

blocks|key|3784688|text|使用ASCII+table选取一定范围的字母，其中：$range_start，$range_end是ASCII表中十进制列的值。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3784689|我发现这个方法比to+the+method+described更好，其中字符的范围是在另一个字符串中专门定义的。|3784690|//+range+is+numbers+(48)+through+capital+and+lower+case+letters+(122)
$range_start+=+48;
$range_end+++=+122;
$random_string+=+"";
$random_string_length+=+10;

for+($i+=+0;+$i+<+$random_string_length;+$i%2B%2B)+{
++$ascii_no+=+round(+mt_rand(+$range_start+,+$range_end+)+);+//+generates+a+number+within+the+range
++//+finds+the+character+represented+by+$ascii_no+and+adds+it+to+the+random+string
++//+study+**chr**+function+for+a+better+understanding
++$random_string+.=+chr(+$ascii_no+);
}

echo+$random_string;|code-block|syntax|javascript|3784691|查看更多信息：|3784692|3784693|chr+function|unordered-list-item|3784694|mt_rand函数|3784695|3784696|entityMap|0|LINK|mutability|MUTABLE|url|http://www.asciitable.com/|1|https://stackoverflow.com/questions/48124/generating-pseudorandom-alpha-numeric-strings#48125|2|http://au.php.net/chr|3|http://au.php.net/mt_rand^0|2|B|0|0|8|N|1|0|0|0|0|0|3|2|0|0|7|3|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|6|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]]|C|$]]|$1|F|3|G|5|H|7|1F|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1G|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|N|3|O|5|P|7|1I|8|@]|9|@$A|1J|B|1K|1|1L]]|C|$]]|$1|Q|3|R|5|P|7|1M|8|@]|9|@$A|1N|B|1O|1|1P]]|C|$]]|$1|S|3|-4|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|T|3|-4|5|6|7|1R|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]|11|$5|W|X|Y|C|$Z|12]]|13|$5|W|X|Y|C|$Z|14]]|15|$5|W|X|Y|C|$Z|16]]]]

Use the <a href="http://www.asciitable.com/" rel="nofollow noreferrer">ASCII table</a> to pick a range of letters, where the: $range_start , $range_end is a value from the decimal column in the ASCII table.

I find that this method is nicer compared <a href="https://stackoverflow.com/questions/48124/generating-pseudorandom-alpha-numeric-strings#48125">to the method described</a> where the range of characters is specifically defined within another string.

<pre><code>// range is numbers (48) through capital and lower case letters (122)
$range_start = 48;
$range_end = 122;
$random_string = "";
$random_string_length = 10;

for ($i = 0; $i &lt; $random_string_length; $i++) {
 $ascii_no = round( mt_rand( $range_start , $range_end ) ); // generates a number within the range
 // finds the character represented by $ascii_no and adds it to the random string
 // study **chr** function for a better understanding
 $random_string .= chr( $ascii_no );
}

echo $random_string;
</code></pre>

See More:

<ul>
<li><a href="http://au.php.net/chr" rel="nofollow noreferrer">chr</a> function</li>
<li><a href="http://au.php.net/mt_rand" rel="nofollow noreferrer">mt_rand</a> function</li>
</ul>

blocks|key|2939854|text|您可以使用以下代码。它类似于现有的函数，除了您可以强制特殊字符计数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2939855|function+random_string()+{
++++//+8+characters:+7+lower-case+alphabets+and+1+digit
++++$character_sets+=+[
++++++++["count"+=>+7,+"characters"+=>+"abcdefghijklmnopqrstuvwxyz"],
++++++++["count"+=>+1,+"characters"+=>+"0123456789"]
++++];
++++$temp_array+=+array();
++++foreach+($character_sets+as+$character_set)+{
++++++++for+($i+=+0;+$i+<+$character_set["count"];+$i%2B%2B)+{
++++++++++++$random+=+random_int(0,+strlen($character_set["characters"])+-+1);
++++++++++++$temp_array[]+=+$character_set["characters"][$random];
++++++++}
++++}
++++shuffle($temp_array);
++++return+implode("",+$temp_array);
}|code-block|syntax|javascript|2939856|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 the following code. It is similar to existing functions except that you can force special character count:
<pre class="lang-php prettyprint-override"><code>function random_string() {
 // 8 characters: 7 lower-case alphabets and 1 digit
 $character_sets = [
 [&quot;count&quot; =&gt; 7, &quot;characters&quot; =&gt; &quot;abcdefghijklmnopqrstuvwxyz&quot;],
 [&quot;count&quot; =&gt; 1, &quot;characters&quot; =&gt; &quot;0123456789&quot;]
 ];
 $temp_array = array();
 foreach ($character_sets as $character_set) {
 for ($i = 0; $i &lt; $character_set[&quot;count&quot;]; $i++) {
 $random = random_int(0, strlen($character_set[&quot;characters&quot;]) - 1);
 $temp_array[] = $character_set[&quot;characters&quot;][$random];
 }
 }
 shuffle($temp_array);
 return implode(&quot;&quot;, $temp_array);
}
</code></pre>

blocks|key|3784812|text|Jeremy的回答很棒。如果像我一样，您不确定如何实现range()，您可以使用range()查看我的版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3784813|<?php
$character_array+=+array_merge(range('a',+'z'),+range(0,+9));
$string+=+"";
++++for($i+=+0;+$i+<+6;+$i%2B%2B)+{
++++++++$string+.=+$character_array[rand(0,+(count($character_array)+-+1))];
++++}
echo+$string;
?>|code-block|syntax|javascript|3784814|这与Jeremy的完全相同，但使用合并数组，其中使用字符串，并使用count()，其中使用strlen()。|3784815|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Jeremy's answer is great. If, like me, you're unsure of how to implement range(), you can see my version using range().

<pre><code>&lt;?php
$character_array = array_merge(range('a', 'z'), range(0, 9));
$string = "";
 for($i = 0; $i &lt; 6; $i++) {
 $string .= $character_array[rand(0, (count($character_array) - 1))];
 }
echo $string;
?&gt;
</code></pre>

This does the exact same thing as Jeremy's but uses merged arrays where he uses a string, and uses count() where he uses strlen().

blocks|key|3784908|text|也许我漏掉了什么但是here's+a+way+using+the+uniqid()+function。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3784909|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.uniqid.php^0|A|14|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]]]]

Maybe I missed something here, but <a href="http://php.net/manual/en/function.uniqid.php" rel="nofollow noreferrer">here's a way using the uniqid() function</a>.

blocks|key|2940077|text|function+generateRandomString($length+=+10)+{
++++$characters+=+'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
++++$charactersLength+=+strlen($characters);
++++$randomString+=+'';
++++for+($i+=+0;+$i+<+$length;+$i%2B%2B)+{
++++++++$randomString+.=+$characters[rand(0,+$charactersLength+-+1)];
++++}
++++return+$randomString;
}
echo+generateRandomString();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2940078|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 generateRandomString($length = 10) {
 $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
 $charactersLength = strlen($characters);
 $randomString = '';
 for ($i = 0; $i &lt; $length; $i++) {
 $randomString .= $characters[rand(0, $charactersLength - 1)];
 }
 return $randomString;
}
echo generateRandomString();
</code></pre>

blocks|key|2940169|text|我知道这是一个古老的帖子，但我想为我根据Jeremy+Ruten的答案创建的一个类做出贡献，并在评论中提出建议：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2940170|++++class+RandomString
++++{
++++++private+static+$characters+=+'abcdefghijklmnopqrstuvwxyz0123456789';
++++++private+static+$string;
++++++private+static+$length+=+8;+//default+random+string+length

++++++public+static+function+generate($length+=+null)
++++++{

++++++++if($length){
++++++++++self::$length+=+$length;
++++++++}

++++++++$characters_length+=+strlen(self::$characters)+-+1;

++++++++for+($i+=+0;+$i+<+self::$length;+$i%2B%2B)+{
++++++++++self::$string+.=+self::$characters[mt_rand(0,+$characters_length)];
++++++++}

++++++++return+self::$string;

++++++}

++++}|code-block|syntax|javascript|2940171|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 know it's an old post but I'd like to contribute with a class I've created based on Jeremy Ruten's answer and improved with suggestions in comments:

<pre><code> class RandomString
 {
 private static $characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
 private static $string;
 private static $length = 8; //default random string length

 public static function generate($length = null)
 {

 if($length){
 self::$length = $length;
 }

 $characters_length = strlen(self::$characters) - 1;

 for ($i = 0; $i &lt; self::$length; $i++) {
 self::$string .= self::$characters[mt_rand(0, $characters_length)];
 }

 return self::$string;

 }

 }
</code></pre>

blocks|key|3785047|text|我喜欢这项工作的功能|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3785048|function+randomKey($length)+{
++++$pool+=+array_merge(range(0,9),+range('a',+'z'),range('A',+'Z'));

++++for($i=0;+$i+<+$length;+$i%2B%2B)+{
++++++++$key+.=+$pool[mt_rand(0,+count($pool)+-+1)];
++++}
++++return+$key;
}

echo+randomKey(20);|code-block|syntax|javascript|3785049|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 like this function for the job

<pre><code>function randomKey($length) {
 $pool = array_merge(range(0,9), range('a', 'z'),range('A', 'Z'));

 for($i=0; $i &lt; $length; $i++) {
 $key .= $pool[mt_rand(0, count($pool) - 1)];
 }
 return $key;
}

echo randomKey(20);
</code></pre>

blocks|key|3785102|text|使用openssl_random_pseudo_bytes函数生成加密强的随机(潜在)8字符字符串：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3785103|echo+bin2hex(openssl_random_pseudo_bytes(4));|code-block|syntax|javascript|3785104|程序方式：|3785105|function+randomString(int+$length):+string
{
++++return+bin2hex(openssl_random_pseudo_bytes($length));
}|3785106|更新：|style|BOLD|3785107|PHP7引入了应该更好的random_x()函数。如果你来自PHP5.X，可以使用优秀的paragonie/random_compat库，它是PHP7的random_bytes()和random_int()的polyfill。|CODE|3785108|function+randomString($length)
{
++++return+bin2hex(random_bytes($length));
}|3785109|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/openssl_random_pseudo_bytes|1|https://packagist.org/packages/paragonie/random_compat|2|http://php.net/random_bytes|3|http://php.net/random_int^0|2|R|0|0|0|0|0|0|3|0|C|A|18|N|1|24|E|2|2J|C|3|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|D|3|E|5|F|7|1D|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|1E|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|1F|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|1G|8|@$A|1H|B|1I|O|P]]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1J|8|@$A|1K|B|1L|O|S]]|9|@$A|1M|B|1N|1|1O]|$A|1P|B|1Q|1|1R]|$A|1S|B|1T|1|1U]]|C|$]]|$1|T|3|U|5|F|7|1V|8|@]|9|@]|C|$G|H]]|$1|V|3|-4|5|6|7|1W|8|@]|9|@]|C|$]]]|W|$X|$5|Y|Z|10|C|$11|12]]|13|$5|Y|Z|10|C|$11|14]]|15|$5|Y|Z|10|C|$11|16]]|17|$5|Y|Z|10|C|$11|18]]]]

Generate cryptographically strong, random (potentially) 8-character string using the <a href="http://php.net/openssl_random_pseudo_bytes" rel="noreferrer">openssl_random_pseudo_bytes</a> function:

<pre><code>echo bin2hex(openssl_random_pseudo_bytes(4));
</code></pre>

Procedural way:

<pre><code>function randomString(int $length): string
{
 return bin2hex(openssl_random_pseudo_bytes($length));
}
</code></pre>

Update:

PHP7 introduced the <code>random_x()</code> functions which should be even better. If you come from PHP 5.X, use excellent <a href="https://packagist.org/packages/paragonie/random_compat" rel="noreferrer">paragonie/random_compat</a> library which is a polyfill for <a href="http://php.net/random_bytes" rel="noreferrer">random_bytes()</a> and <a href="http://php.net/random_int" rel="noreferrer">random_int()</a> from PHP 7.

<pre><code>function randomString($length)
{
 return bin2hex(random_bytes($length));
}
</code></pre>

blocks|key|3785147|text|我制作了下面的快速函数，只是为了玩弄range()函数。总有一天会对别人有所帮助。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3785148|Function+pseudostring($length+=+50)+{

++++//+Generate+arrays+with+characters+and+numbers
++++$lowerAlpha+=+range('a',+'z');
++++$upperAlpha+=+range('A',+'Z');
++++$numeric+=+range('0',+'9');

++++//+Merge+the+arrays
++++$workArray+=+array_merge($numeric,+array_merge($lowerAlpha,+$upperAlpha));
++++$returnString+=+"";

++++//+Add+random+characters+from+the+created+array+to+a+string
++++for+($i+=+0;+$i+<+$length;+$i%2B%2B)+{
++++++++$character+=+$workArray[rand(0,+61)];
++++++++$returnString+.=+$character;
++++}

++++return+$returnString;
}|code-block|syntax|javascript|3785149|entityMap^0|I|7|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|$]]

I have made the following quick function just to play around with the <code>range()</code> function. It just might help someone sometime.

<pre><code>Function pseudostring($length = 50) {

 // Generate arrays with characters and numbers
 $lowerAlpha = range('a', 'z');
 $upperAlpha = range('A', 'Z');
 $numeric = range('0', '9');

 // Merge the arrays
 $workArray = array_merge($numeric, array_merge($lowerAlpha, $upperAlpha));
 $returnString = "";

 // Add random characters from the created array to a string
 for ($i = 0; $i &lt; $length; $i++) {
 $character = $workArray[rand(0, 61)];
 $returnString .= $character;
 }

 return $returnString;
}
</code></pre>

blocks|key|5195671|text|这是我使用的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5195672|$cryptoStrong+=+true;+//+can+be+false
$length+=+16;+//+Any+length+you+want
$bytes+=+openssl_random_pseudo_bytes($length,+$cryptoStrong);
$randomString+=+bin2hex($bytes);|code-block|syntax|javascript|5195673|您可以看到Docs+for+openssl_random_pseudo_bytes+here和Docs+for+bin2hex+here|offset|length|5195674|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.openssl-random-pseudo-bytes.php|1|http://php.net/manual/en/function.bin2hex.php^0|0|0|5|15|0|1B|L|1|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]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]|$I|10|J|11|1|12]]|A|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

This is something I use:

<pre><code>$cryptoStrong = true; // can be false
$length = 16; // Any length you want
$bytes = openssl_random_pseudo_bytes($length, $cryptoStrong);
$randomString = bin2hex($bytes);
</code></pre>

You can see the <a href="http://php.net/manual/en/function.openssl-random-pseudo-bytes.php" rel="nofollow noreferrer">Docs for openssl_random_pseudo_bytes here</a>, and the <a href="http://php.net/manual/en/function.bin2hex.php" rel="nofollow noreferrer">Docs for bin2hex here</a>

blocks|key|3785229|text|1行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3785230|$FROM+=+0;+$TO+=+'zzzz';
$code+=+base_convert(rand(+$FROM+,base_convert(+$TO+,+36,10)),10,36);
echo+$code;|code-block|syntax|javascript|3785231|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|$]]

1 line:

<pre><code>$FROM = 0; $TO = 'zzzz';
$code = base_convert(rand( $FROM ,base_convert( $TO , 36,10)),10,36);
echo $code;
</code></pre>

blocks|key|722670|text|一行解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|722671|echo+substr(+str_shuffle(+str_repeat(+'abcdefghijklmnopqrstuvwxyz0123456789',+10+)+),+0,+7+);|code-block|syntax|javascript|722672|您可以更改substr参数，以便为字符串设置不同的长度。|722673|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

One line solution:

<pre><code>echo substr( str_shuffle( str_repeat( 'abcdefghijklmnopqrstuvwxyz0123456789', 10 ) ), 0, 7 );
</code></pre>

You can change the substr parameter in order to set a different length for your string.

blocks|key|3785301|text|如果您想要一种非常简单的方法，您可以依靠现有的PHP函数。这是我使用的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3785302|substr(+sha1(+time()+),+0,+15+)|offset|length|style|CODE|3785303|time()向您提供从纪元开始的当前时间(以秒为单位)，sha1()将其加密为0-9a-f的字符串，而substr()允许您选择长度。您不必从字符0开始，并且无论两个数字之间的差异是什么，都将是字符串的长度。|3785304|entityMap^0|0|0|V|0|0|6|S|6|1F|8|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]|$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|K|$]]

If you want a very easy way to do this, you can lean on existing PHP functions. This is the code I use:

<code>substr( sha1( time() ), 0, 15 )</code>

<code>time()</code> gives you the current time in seconds since epoch, <code>sha1()</code> encrypts it to a string of 0-9a-f, and <code>substr()</code> lets you choose a length. You don't have to start at character 0, and whatever the difference is between the two numbers will be the length of the string.

blocks|key|2940579|text|使用hint+/+rand_int类型实现真正随机性的现代方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2940580|function+random_string(int+$size):+string
{
++++$characters+=+array_merge(
++++++++range(0,+9),
++++++++range('A',+'Z')
++++);

++++$string+=+'';
++++$max+=+count($characters)+-+1;
++++for+($i+=+0;+$i+<+$size;+$i%2B%2B)+{
++++++++$string+.=+$characters[random_int(0,+$max)];
++++}

++++return+$string;
}|code-block|syntax|javascript|2940581|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|$]]

The modern way to do that with type hint / rand_int for real randomeness 

<pre><code>function random_string(int $size): string
{
 $characters = array_merge(
 range(0, 9),
 range('A', 'Z')
 );

 $string = '';
 $max = count($characters) - 1;
 for ($i = 0; $i &lt; $size; $i++) {
 $string .= $characters[random_int(0, $max)];
 }

 return $string;
}
</code></pre>

blocks|key|3785451|text|简单的人..。但请记住，每个字节都是0到255之间的随机数，对于随机字符串来说，这是可以接受的。还要记住，您将使用两个字符来表示每个字节。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3785452|$str+=+bin2hex(random_bytes(32));++//+64+character+string+returned|code-block|syntax|javascript|3785453|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|$]]

Simple guys .... but remember each byte is random between 0 and 255 which for a random string will be fine. Also remember you'll have two characters to represent each byte.

<pre><code>$str = bin2hex(random_bytes(32)); // 64 character string returned
</code></pre>

blocks|key|3785486|text|首先列出所需的字符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3785487|$chars+=+'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';|code-block|syntax|javascript|3785488|使用str_shuffle($string)函数。此函数将为您提供一个随机混洗的字符串。|3785489|$alpha=substr(str_shuffle($chars),+0,+50);|3785490|50是字符串的长度。|3785491|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

First list the desired characters

<pre><code>$chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
</code></pre>

Use the str_shuffle($string) function. This function will provide you a randomly shuffled string.

<pre><code>$alpha=substr(str_shuffle($chars), 0, 50);
</code></pre>

50 is the Length of string.

blocks|key|727696|text|public+function+randomString($length+=+8)
{
++++$characters+=+implode([
++++++++'ABCDEFGHIJKLMNOPORRQSTUWVXYZ',
++++++++'abcdefghijklmnoprqstuwvxyz',
++++++++'0123456789',
++++++++//'!@#$%25%5E&*?'
++++]);

++++$charactersLength+=+strlen($characters)+-+1;
++++$string+++++++++++=+'';

++++while+($length)+{
++++++++$string+.=+$characters[mt_rand(0,+$charactersLength)];
++++++++--$length;
++++}

++++return+$string;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|727697|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>public function randomString($length = 8)
{
 $characters = implode([
 'ABCDEFGHIJKLMNOPORRQSTUWVXYZ',
 'abcdefghijklmnoprqstuwvxyz',
 '0123456789',
 //'!@#$%^&amp;*?'
 ]);

 $charactersLength = strlen($characters) - 1;
 $string = '';

 while ($length) {
 $string .= $characters[mt_rand(0, $charactersLength)];
 --$length;
 }

 return $string;
}
</code></pre>

How can I generate a (pseudo)random alpha-numeric string, something like: 'd79jd8c' in PHP?

Generating (pseudo)random alpha-numeric strings

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何生成一个(伪)随机字母数字字符串，例如：'d79jd8c‘？

问生成(伪)随机字母数字字符串
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