Home >Backend Development >PHP Tutorial >PHP generates random string program code_PHP tutorial

PHP generates random string program code_PHP tutorial

WBOYOriginal: 2016-07-13 16:57:05960browse

Because the tool requires us to write a function that can generate random strings. I was thinking that there should be many such random string generating functions on the Internet. I searched a lot on Baidu. Now I will summarize these good PHP functions for you. .

Use a for loop to traverse the characters we defined

The code is as follows

代码如下	复制代码
/* Generate Password * Length : 8 */ $str = “0123456789abcdefghijklmnopqrstuvwxyz”; // 输出字符集 $n = 8; // 输出串长度 $len = strlen($str)-1; for($i=0 ; $i<$n; $i++){ $s .= $str[rand(0,$len)]; } echo $s . “ ”; ?>

Copy code

/* Generate Password
* Length: 8

代码如下

复制代码

function getRandStr($length) {
$str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randString = '';
$len = strlen($str)-1;
for($i = 0;$i < $length;$i ++){
$num = mt_rand(0, $len);
$randString .= $str[$num];
}
return $randString ;
}

//使用方法如下
$test=getRandStr($length=5);
echo $test;
?>

$str = “0123456789abcdefghijklmnopqrstuvwxyz”; // Output character set

$n = 8; // Output string length

$len = strlen($str)-1;

代码如下

复制代码

/**
*/
function createRandomStr($length){
$str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62个字符
$strlen = 62;
while($length > $strlen){
   $str .= $str;
   $strlen += 62;
  }
  $str = str_shuffle($str);
  return substr($str,0,$length);
}
echo createRandomStr(10);

for($i=0; $i<$n; $i++){

$s .= $str[rand(0,$len)];

}

代码如下

复制代码

/**
*@blog
*/
function createRandomStr($length){
  $str = array_merge(range(0,9),range('a','z'),range('A','Z'));
  shuffle($str);
  $str = implode('',array_slice($str,0,$length));
  return $str;
}
echo createRandomStr(10);
?> echo $s . “
”; ?> Can generate pure numeric strings, character strings, etc. of specified length. (Uppercase, lowercase, uppercase and lowercase, and a combination of uppercase and lowercase and numbers can also be expanded according to preference). $length=5 below, if you change it to 10, it will be 10 digits. Change $str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ' to $str = '0123456789' which is a pure numeric string.

The code is as follows

Copy code

function getRandStr($length) { <🎜> $str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; <🎜> $randString = ''; <🎜> $len = strlen($str)-1; <🎜> for($i = 0;$i < $length;$i ++){ <🎜> $num = mt_rand(0, $len); <🎜> $randString .= $str[$num]; <🎜> } <🎜> return $randString ; <🎜> }<🎜> <🎜>//How to use it is as follows<🎜> $test=getRandStr($length=5);<🎜> echo $test;<🎜> ?> or use while

The code is as follows

Copy code

/**<🎜> */<🎜> function createRandomStr($length){<🎜> $str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62 characters<🎜> $strlen = 62;<🎜> while($length > $strlen){ $str .= $str; $strlen += 62; } $str = str_shuffle($str); Return substr($str,0,$length); } echo createRandomStr(10); ?> Use the idea of array and character conversion:

The code is as follows

Copy code

/**<🎜> *@blog *@blog */ function createRandomStr($length){ $str = array_merge(range(0,9),range('a','z'),range('A','Z')); shuffle($str); $str = implode('',array_slice($str,0,$length)); return $str; } echo createRandomStr(10); ?>

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：iframe no refresh file upload implementation program_PHP tutorialNext article：iframe no refresh file upload implementation program_PHP tutorial

See more

PHP generates random string program code_PHP tutorial

Related articles