<?php 

function random($length,$chars='0123456789')
{
	$hash = '';
	$chars = '0123456789';
	$max = strlen($chars) - 1;
	mt_srand((double)microtime() * 1000000);
	for($i = 0; $i < $length; $i++) {
		$hash .= $chars[mt_rand(0, $max)];
	}
	return $hash;
}

function phpcms_base64($str,$type='encode',$token='/',$sp='_')
{
	//$type: 1=encode 0=decode
	$encode = $type == "encode" ? 1 : 0;
	$str=trim($str);
	if($encode)
	{
		$str=base64_encode($str);
		$str2=str_replace($token,$sp,$str);
	}
	else
	{
		$str=str_replace($sp,$token,$str);
		$str2=base64_decode($str);
	}
	return $str2;
}
?>