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php password hash function

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  1. function crypt_pass($pass, $salt=NULL)
  2.     {
  3.         $salt_len=7;
  4.         $algo='sha256';
  5.  
  6.         if (!$salt||strlen($salt)<$salt_len)
  7.         {
  8.             $salt=uniqid(rand(), TRUE);     // get unique string (length==23)
  9.         }
  10.         $salt=substr($salt, 0, $salt_len);
  11.  
  12.         if (function_exists('hash') && in_array($algo, hash_algos()))
  13.         {
  14.             $hashed=hash($algo, $salt.$pass);
  15.         }
  16.         else
  17.         {
  18.             $hashed=sha1($salt.$pass);
  19.         }
  20.         return $salt.$hashed;
  21.     }

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