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function create_guid()
{
$microTime = microtime();
list($a_dec, $a_sec) = explode(" ", $microTime);
$dec_hex = dechex($a_dec* 1000000);
$sec_hex = dechex($a_sec);
ensure_length($dec_hex, 5);
ensure_length($sec_hex, 6);
$guid = "";
$guid .= $dec_hex;
$guid .= create_guid_section(3);
$guid .= '-';
$guid .= create_guid_section(4);
$guid .= '-';
$guid .= create_guid_section(4);
$guid .= '-';
$guid .= create_guid_section(4);
$guid .= '-';
$guid .= $sec_hex;
$guid .= create_guid_section(6);
return $guid;
}
function create_guid_section($characters)
{
$return = "";
for($i=0; $i<$characters; $i++)
{
$return .= dechex(mt_rand(0,15));
}
return $return;
}