Most Referenced Functions
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  » site_pageranks()
  » imagepng()
  » imagestring()
  » imagedestroy()
  » htmlentities()
  » imagecolorallocate()
  » fopen()
  » preg_match()
  » header()
  » getimagesize()
  » session_start()
  » ob_start()
  » preg_match_all()
  » strstr()
  » ob_flush()
  » flush()
  » htmlspecialchars()
  » str_replace()
  » strpos()
  » array2vars()
  » nl2br()
  » setcookie()
  » urlencode()
  » preg_split()
  » ereg()
  » ereg_replace()
  » var_dump()

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PHP Functions

Function: srand

(PHP 3, PHP 4, PHP 5)

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.

Example 1. srand() example

<?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.

Related Function(s)

  • mt_srand()
  • rand()
  • getrandmax()
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