PHP7 使用session_set_save_handler

项目原本是在php5.4.45-nts运行的,后面升级到PHP7,发现session总是存储不了
我的session是通过session_set_save_handler自定义存储到数据库中
正常的seesion过程应该是open->read->write->close
升级PHP后变成了open->read->close
所以就去检查了read函数public function read($sessID)
{
$sql = 'SELECT session_data AS d FROM ' . $this->prefix . 'sessions WHERE session_id = \'' . $sessID . '\' AND session_expires >' . TIMES;
$row = $this->db->get_one($sql);

if ($row) {
$data = $row['d'];
return $data;
}
return false;
}在没有数据的时候 retrun false;
最终确定问题也是这个return false;修改为return '';即可
具体原因我也不是很清楚,应该是return false导致session自己直接跳过write了
附上完整的重写函数：<?php
class db_sessions extends app_models
{
public $lifeTime = '';
public function db_sessions()
{
parent::__construct();
session_set_save_handler(array(&$this, 'open'), array(&$this, 'close'), array(&$this, 'read'), array(&$this, 'write'), array(&$this, 'destroy'), array(&$this, 'gc'));
}
public function open($savePath, $sessName)
{
$this->lifeTime = 3600;
return true;
}
public function close()
{
$this->gc(ini_get('session.gc_maxlifetime'));
return true;
}
public function read($sessID)
{
$sql = 'SELECT session_data AS d FROM ' . $this->prefix . 'sessions WHERE session_id = \'' . $sessID . '\' AND session_expires >' . TIMES;
$row = $this->db->get_one($sql);

if ($row) {
$data = $row['d'];
return $data;
}
return '';
}
public function write($sessID, $sessData)
{
if (!($sessData)) {
return false;
}
$newExp = TIMES + $this->lifeTime;
$sql = 'SELECT * FROM ' . $this->prefix . 'sessions WHERE session_id = \'' . $sessID . '\'';
$num = $this->db->get_num($sql);

if ($num) {
$this->db->query('UPDATE ' . $this->prefix . 'sessions SET session_expires = \'' . $newExp . '\', session_data = \'' . $sessData . '\' WHERE session_id = \'' . $sessID . '\'');

if ($this->db->affected_rows()) {
return true;
}
}
else {
$this->db->query('INSERT INTO ' . $this->prefix . 'sessions ( session_id, session_expires, session_data) VALUES( \'' . $sessID . '\', \'' . $newExp . '\', \'' . $sessData . '\')');

if ($this->db->affected_rows()) {
return true;
}
}
return false;
}
public function destroy($sessID)
{
$this->db->query('DELETE FROM ' . $this->prefix . 'sessions WHERE session_id = \'' . $sessID . '\'');

if ($this->db->affected_rows()) {
return true;
}
return false;
}
public function gc($sessMaxLifeTime)
{
$this->db->query('DELETE FROM ' . $this->prefix . 'sessions WHERE session_expires < ' . TIMES);
return true;
}
public function __destruct()
{
session_write_close();
}
}

?>