下面来看看在很多程序语言中会使用到的class吧，现在会举个简单的实例来实现php class,类申明,class使用方法哦。
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/*
* Explorer! 函数库
* 编写日期：2008-06-29
* 最后更新：2008-07-18 2:08
*
*/
class System{//系统部分
function usr_level($name){
$SQL = new MySQL();
$SQL->Query("SELECT `level` FROM `members` WHERE `username` = '$name';");
$SQL->NextRecord();
$TMP = $SQL->GetRecord('level');
$SQL->Free();
return $TMP;
}
function channel_level($cid){
$SQL = new MySQL();
$SQL->Query("SELECT `level` FROM `channels` WHERE `id` = $id;");
$SQL->NextRecord();
$TMP = $SQL->GetRecord('id');
$SQL->Free();
return $TMP;
}
function uid2name($uid){
$SQL = new MySQL();
if($SQL->Query("SELECT `username` FROM `members` WHERE `uid` = $uid;")){
$SQL->NextRecord();
$TMP = $SQL->GetRecord('username');
$SQL->Free();
return $TMP;
}else{
return 0;
}
}
function name2uid($name){
$SQL = new MySQL();
if($SQL->Query("SELECT `uid` FROM `members` WHERE `username` = '$name';")){
$SQL->NextRecord();
$TMP = $SQL->GetRecord('uid');
$SQL->Free();
return $TMP;
}else{
return 0;
}
}
function sysinfo($Name){//获取系统信息
$SQL = new MySQL();
$SQL->Query("SELECT * FROM `sysinfo`;");
$SQL->NextRecord();
$TMP = $SQL->GetRecord($Name);
$SQL->Free();
return $TMP;
}
function find_member($name){//查找该用户（注册时需要）
$SQL = New MySQL();
$SQL->Query("SELECT * FROM `members` WHERE `username` = '$name';");
$RS = $SQL->RowS();
$SQL->Free();
if($RS)
return 1;
else
return 0;
}
function str_safe($str){//字符串安全过滤
$str = str_replace($str,";","；");
$str = str_replace($str,"'","‘");
$str = str_replace($str,"/","／");
$str = str_replace($str,"`","｀");
$str = str_replace($str,"\","＼");
return $str;
}
function GetMyIP()
{
if ($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"])
$ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
elseif ($HTTP_SERVER_VARS["HTTP_CLIENT_IP"])
$ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"];
elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"])
$ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];
elseif (getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
elseif (getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP");
elseif (getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "127.0.0.1";
return $ip;
}
function Version(){
return "1.0.9";
}
}
class MySQL{//数据库部分
var $DBServer = 'localhost';//服务器
var $DBName = '';//数据库名称
var $DBUser = '';//数据库用户
var $DBPass = '';//数据库密码
var $OnErrorResume = 1;//错误提示关闭
var $LinkID = 0;//连接句柄
var $QueryID = 0;//查询句柄
var $ResultS = array();//查询结果集
var $Error = '';//错误信息
function Connect($Srv = "",$Usr = "",$Pass = "",$DB = ""){//连接数据库
if($Srv == "") $Srv = $this->DBServer;
if($Usr == "") $Usr = $this->DBUser;
if($Pass == "") $Pass = $this->DBPass;
if($DB == "") $DB = $this->DBName;
if($this->LinkID == 0){
$this->LinkID = @mysql_connect($Srv,$Usr,$Pass) or die("数据库连接失败，请联系管理员修复此问题。");
}
@mysql_select_db($DB,$this->LinkID) or die("数据库选择失败，请联系管理员修复此问题。");
return $this->LinkID;
}
function Free(){//释放查询结果
@mysql_free_result($this->QueryID);
$this->QueryID = 0;
}
function RowS(){//查询到的记录总数
if(!$this->QueryID) return 0;
return @mysql_num_rows($this->QueryID);
}
function NextRecord(){//下一条记录
if(!$this->QueryID) return 0;
$this->ResultS = @mysql_fetch_array($this->QueryID);
}
function Seek($seek){
if(!$this->QueryID) return 0;
@mysql_data_seek($this->QueryID,$seek);
}
function Query($Sql){//执行查询
if($Sql == "") return 0;
if($this->LinkID == 0) $this->Connect();
if($this->QueryID) $this->Free();//释放原来查询结果
$this->QueryID = @mysql_query($Sql,$this->LinkID);
$this->Error = mysql_error($this->LinkID);
if(!$this->QueryID) exit("$Sql执行失败.");
return $this->QueryID;
}
function GetRecord($Name){
if(!$this->QueryID) return 0;
return $this->ResultS[$Name];
}
}
?>
