PHP封装的数据库保存session功能类
本文实例讲述了PHP封装的数据库保存session功能类。分享给大家供大家参考，具体如下：
PHP用数据库保存session类：
<?php
classSafeSessionHandlerimplementsSessionHandlerInterface{
public$save_path;
public$session_name;
public$table;
publicfunction__construct(){
$this->table=newTable("safe_session");
}
privatefunctionsession_id_parse($session_id){
$time=hexdec(substr($session_id,0,8));
$skey=substr($session_id,8);
returnarray($time,$skey);
}
publicfunctionclose(){
loginfo("close:");
returntrue;
}
publicfunctioncreate_sid(){
loginfo("create_sid:");
$time=time();
$skey="";
$char="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
for($i=0;$i<52;$i++){
$skey.=$char{mt_rand(0,61)};
}
$session=array(
"time"=>$time,
"skey"=>$skey,
"sval"=>"",
);
$this->table->insert($session);
returndechex($time).$skey;
}
publicfunctiondestroy($session_id){
loginfo("destroy:%s",$session_id);
list($time,$skey)=$this->session_id_parse($session_id);
$this->table->where("time=?",$time)->where("skey=?",$skey)->delete();
returntrue;
}
publicfunctiongc($maxlifetime){
loginfo("gc:%s",$maxlifetime);
$this->table->where("time<?",time()-86400*30)->delete();
returntrue;
}
publicfunctionopen($save_path,$session_name){
loginfo("open:%s,%s",$save_path,$session_name);
$this->save_path=$save_path;
$this->session_name=$session_name;
returntrue;
}
publicfunctionread($session_id){
loginfo("read:%s",$session_id);
list($time,$skey)=$this->session_id_parse($session_id);
$row=$this->table->where("time=?",$time)->where("skey=?",$skey)->select()->fetch();
if(empty($row)){
return"";
}
return$row["sval"];
}
publicfunctionwrite($session_id,$session_data){
loginfo("write:%s,%s",$session_id,$session_data);
$session=array("sval"=>$session_data,);
list($time,$skey)=$this->session_id_parse($session_id);
$this->table->where("time=?",$time)->where("skey=?",$skey)->update($session);
returntrue;
}
}
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