   #PHP Manual Mathematical Functions sqrt tan

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                                     srand

   (PHP 3, PHP 4 )
   srand -- Seed the random number generator

Description

   void srand ( [int seed])

   Seeds the random number generator with seed. Since PHP 4.2.0, the seed
   becomes optional and defaults to a random value if omitted.

   <?php
   // seed with microseconds
   function make_seed() {
       list($usec, $sec) = explode(' ', microtime());
       return (float) $sec + ((float) $usec * 100000);
   }
   srand(make_seed());
   $randval = rand();
   ?>

     Note: As of PHP 4.2.0, there is no need to seed the random number
     generator with srand() or mt_srand() as this is now done
     automatically.

   See also rand(), getrandmax() and mt_srand().
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