PHP generates random strings and unique strings

Description: The method used to generate the random string has Mt_rand ()

The method used to generate the unique string has MD5 (), uniqid (), Microtime ()

Code:

1<?PHP2 /*3 * Generate random string4 * @param int $length to generate the length of a random string5 * @param string $char strings that make up a random string6 * A random string generated @return string $string7  */8 functionStr_rand ($length= 32,$char= ' 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ') {9     if(!Is_int($length) ||$length< 0) {Ten         return false; One     } A  -     $string= ' '; -      for($i=$length;$i> 0;$i--) { the         $string.=$char[Mt_rand(0,strlen($char)-1)]; -     } -  -     return $string; + } -  + EchoStr_rand (), "<br/>"; A  at /* - * Generate 32-bit unique strings -  */ - $uniqid=MD5(uniqid(Microtime(true),true)); - Echo $uniqid;

PHP generates random strings and unique strings