PHP generates random string program code

Source: Internet
Author: User
Tags character set strlen

Use the for loop to traverse the defined characters.

The code is as follows: Copy code


<? Php
/* Generate Password
* Length: 8
*/
$ Str = "0123456789abcdefghijklmnopqrstuvwxyz"; // output character set
$ N = 8; // output string length
$ Len = strlen ($ str)-1;
For ($ I = 0; $ I <$ n; $ I ++ ){
$ S. = $ str [rand (0, $ len)];
}
Echo $ s. "<br/> ";
?>


It can generate a string of numbers, character strings, and so on.
(The combination of upper-case, lower-case, upper-case, and upper-case numbers can also be expanded based on your preferences ).

The following $ length = 5 is 10 digits if you change it to 10.
Change $ str = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz 'to $ str = '123', which is a pure numeric string.

The code is as follows: Copy code

<? Php
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;
}

// Use the following method:
$ Test = getRandStr ($ length = 5 );
Echo $ test;
?>

Or use the while

The code is as follows: Copy code

<? Php
/**
*/
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 );

?>

The idea of array and character conversion is used:

The code is as follows: Copy code

<? Php
/**
* @ Blog <www.111cn.net>
*/
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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