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PHP generates random string program code_PHP tutorial

WBOYOriginal: 2016-07-13 16:57:05938browse

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 . “ ”; ?>

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/* 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

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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

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/**<🎜> */<🎜> 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); ?>

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