Generate a random string in PHP

Below is a example of human readable string generated by random number.

/************* 

*@l - length of random string 

*/  

function generate_rand($l){  

  $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";  

  srand((double)microtime()*1000000);  

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

      $rand.= $c[rand()%strlen($c)];  

  }  

  return $rand;  

 }  

- See more at: http://webdeveloperplus.com/php/21-really-useful-handy-php-code-snippets/#sthash.viN5rAfv.dpuf