<?php

class Common_Util{

	/**
	 * 随机字符串
	 * @param int $length 长度
	 * @param int $numeric 类型(0：混合；1：纯数字)
	 * @return string
	 */
	public static function random($length, $numeric = 0) {
		 $seed = base_convert(md5(microtime().$_SERVER['DOCUMENT_ROOT']), 16, $numeric ? 10 : 35);
		 $seed = $numeric ? (str_replace('0', '', $seed).'012340567890') : ($seed.'zZ'.strtoupper($seed));
		 if($numeric) {
			  $hash = '';
		 } else {
			  $hash = chr(rand(1, 26) + rand(0, 1) * 32 + 64);
			  $length--;
		 }
		 $max = strlen($seed) - 1;
		 for($i = 0; $i < $length; $i++) {
			  $hash .= $seed{mt_rand(0, $max)};
		 }
		 return $hash;
	}

	/**
	 * 更新角色权限
	 * @return [type] [description]
	 */
	public function updateRoleAuth(){
		$role_service = new Service_Role();
		$roles = $role_service->getRoleList();
		$role_auths = array();
		foreach ($roles as $role) {
			$role_auth[$role['_id']] = explode(',', $role['modules']);
		}
		//初始化redis
        $redis = System_Service_Locator::getInstance()->get('redis');
        $redis->set('role_auth', $role_auth);
	}


}