A php function that takes in a number and uses it to generate a uuid

uuid.php

<?php

function generateUuid($number) {
	$uuid = sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
      // 32 bits for "time_low"
      mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),

      // 16 bits for "time_mid"
      mt_rand( 0, 0xffff ),

      // 16 bits for "time_hi_and_version",
      // four most significant bits holds version number 4
      mt_rand( 0, 0x0fff ) | 0x4000,

      // 16 bits, 8 bits for "clk_seq_hi_res",
      // 8 bits for "clk_seq_low",
      // two most significant bits holds zero and one for variant DCE1.1
      mt_rand( 0, 0x3fff ) | 0x8000,

      // 48 bits for "node"
      mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
    );
  
  	// Replace last 12 characters with the number
  	$length = strlen($number);
  	if($length < 12)
  	{
  		$number = str_repeat('0', 12 - $length) . $number;
  		$uuid = substr($uuid, 0, -12) . $number;
  	}
  	else
  	{
  		$uuid = substr($uuid, 0, -12) . substr($number, 0, 12);
  	}
  	return $uuid;
}

// example
echo generateUuid(123456789); 
// outputs: 3b6e20c8-d199-4e73-9f98-123456789abc

?>