PHP generates random strings

Principle:

Define a string that contains the characters you want, here are the uppercase and lowercase letters , and the numbers ,

Generate random numbers using the rand () method that comes with PHP, and call the rand () function several times based on the length of the resulting string.

Each randomly generated number is the subscript of the string, and finally all the characters are made into a new string to return

1<?PHP2 3   /**4 * * $length: The length of the result String5   **/6   functionGetrandchar ($length){7      $str=NULL;8      $strPol= "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//Uppercase and lowercase letters and numbers9      $max=strlen($strPol)-1;Ten       One       for($i= 0;$i<$length;$i++){ A         $str.=$strPol[Rand(0,$max)]; -      } -      return $str; the   } -   -   EchoGetrandchar (10); -?>

View Code

PHP generates random strings