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                                    uniqid

   (PHP 3, PHP 4 )
   uniqid -- Generate a unique ID

Description

   string uniqid ( string prefix [, bool lcg])

   uniqid() returns a prefixed unique identifier based on the current
   time in microseconds. The prefix can be useful for instance if you
   generate identifiers simultaneously on several hosts that might happen
   to generate the identifier at the same microsecond. Prefix can be up
   to 114 characters long.

   If the optional lcg parameter is TRUE, uniqid() will add additional
   "combined LCG" entropy at the end of the return value, which should
   make the results more unique.

   With an empty prefix, the returned string will be 13 characters long.
   If lcg is TRUE, it will be 23 characters.

     Note: The lcg parameter is only available in PHP 4 and PHP 3.0.13
     and later.

   If you need a unique identifier or token and you intend to give out
   that token to the user via the network (i.e. session cookies), it is
   recommended that you use something along these lines:

   <?php
   // no prefix
   $token = md5(uniqid(""));
   // better, difficult to guess
   $better_token = md5(uniqid(rand(), true));
   ?>

   This will create a 32 character identifier (a 128 bit hex number) that
   is extremely difficult to predict.
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