What is the difference between "rands" in PHP?

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I would like to know what differs the Rand from mt_rand and mt_srand; And if you have any other Rand.

php

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mt_rand: Improved Random Number Generator

<?php
   echo mt_rand() . "\n";
   echo mt_rand() . "\n";
   echo mt_rand(5, 15);
?>

mt_srand: Sow the improved random number generator

<?php
   // semente de microsegundos
   function make_seed()
   {
      list($usec, $sec) = explode(' ', microtime());
      return (float) $sec + ((float) $usec * 100000);
   }
   mt_srand(make_seed());
   $randval = mt_rand();
?>

srand: Sow the random number generator

<?php
   // Semeia com microsegundos
   function make_seed()
   {
      list($usec, $sec) = explode(' ', microtime());
      return $sec + $usec * 1000000;
   }
   srand(make_seed());
   $randval = rand();
?>

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