php中使用session_set_save_handler()函數(shù)把session保存到MySQL數(shù)據(jù)庫實例
Jun 06, 2016 pm 08:18 PM這篇文章主要介紹了php中使用session_set_save_handler()函數(shù)把session保存到MySQL數(shù)據(jù)庫實例,本文同時還給出了Session保存到Mysql數(shù)據(jù)庫存儲類,需要的朋友可以
PHP保存session默認(rèn)的是采用的文件的方式來保存的,這僅僅在文件的空間開銷很小的windows上是可以采用的,但是如果我們采用uinx或者是liux上的文件系統(tǒng)的時候,這樣的文件系統(tǒng)的文件空間開銷是很大的,然而session是要時時刻刻的使用的,大量的用戶就要創(chuàng)建很多的session文件,這樣對整個的服務(wù)器帶來性能問題。
另一方面,如果服務(wù)器起采用群集的方式的話就不能保持session的一致性,所以我們就緒要采用數(shù)據(jù)庫的方式來保存session,這樣,不管有幾臺服務(wù)器同時使用,只要把他們的session保存在一臺數(shù)據(jù)庫服務(wù)器上就可以保證session的完整了,具體如何來實現(xiàn)請繼續(xù)看下去。
PHP保存session默認(rèn)的情況下是采用的文件方式來保存的,我們在PHP的配制文件PHP.ini中可以看到這樣的一行:
復(fù)制代碼 代碼如下:
session.save_handler="files"
這樣的意思就是采用文件來保存session 的,要采用數(shù)據(jù)庫來保存的話,我們需要修改成用戶模式,改成
復(fù)制代碼 代碼如下:
session.save_handler="use"
就可以了,但是,這僅僅是說明我門沒有采用文件的方式存儲session,我們還要選擇數(shù)據(jù)庫和建立數(shù)據(jù)庫的表。
建立數(shù)據(jù)庫和數(shù)據(jù)庫的表結(jié)構(gòu),我們可以采用PHP可以使用的任何的數(shù)據(jù)庫,因為PHP和mysql的結(jié)合最好,我就使用mysql來做示例,當(dāng)然根據(jù)你的需要可以改稱別的數(shù)據(jù)庫。
創(chuàng)建數(shù)據(jù)庫
復(fù)制代碼 代碼如下:
create database 'session';
創(chuàng)建表結(jié)構(gòu)
復(fù)制代碼 代碼如下:
create table 'session'( id char(32) not null , 'user 'char(30), data char(3000) ,primary key ('id') );
PHP保存session編寫PHP文件
復(fù)制代碼 代碼如下:
$con = mysql_connect("127.0.0.1", "user" , "pass");
mysql_select_db("session");
function open($save_path, $session_name) {
?return(true);
}
function close() {
?return(true);
}
function read($id) {
?if ($result = mysql_query("select * from session where")) {
??if ($row = mysql_felth_row($result)) {
???return $row["data"];
??}
?} else {
??return "";
?}
}
function write($id, $sess_data) {
?if ($result = mysql_query("update session set data='$sess_data' where")) {
??return true;
?} else {
??return false;
?}
}
function destroy($id) {
?if ($result = mysql_query("delete * from session where")) {
??return true;
?} else {
??return false;
?}
}
function gc($maxlifetime) {
?return true;
}
session_set_save_handler("open", "close", "read", "write", "destroy", "gc");
session_start();
// proceed to use sessions normally
保存成為session_user_start.php。
現(xiàn)在我們的PHP保存session的工作就已經(jīng)完成了,只要你在需要在使用session的時候,把session_user_start.php包含進(jìn)來.注意,這個文件一定要在文件的第一行包含,然后就像使用文件的session一樣的方法使用就可以了。
以上僅僅是個簡單教程,在實際的應(yīng)用中,可以對它封裝得更專業(yè)些,參考代碼如下:
SessionMysql.class.php
復(fù)制代碼 代碼如下:
/**
?* SessionMysql 數(shù)據(jù)庫存儲類
?*/
defined('IN_QIAN') or exit('Access Denied');
class SessionMysql {
?public $lifetime = 1800; // 有效期,單位:秒(s),默認(rèn)30分鐘
?public $db;
?public $table;
?/**
? * 構(gòu)造函數(shù)
? */
?public function __construct() {
??$this->db = Base::loadModel('SessionModel');
??$this->lifetime = Base::loadConfig('system', 'session_lifetime');
??session_set_save_handler(
???array(&$this, 'open'),??// 在運行session_start()時執(zhí)行
???array(&$this, 'close'),??// 在腳本執(zhí)行完成 或 調(diào)用session_write_close() 或 session_destroy()時被執(zhí)行,即在所有session操作完后被執(zhí)行
???array(&$this, 'read'),??// 在運行session_start()時執(zhí)行,因為在session_start時,會去read當(dāng)前session數(shù)據(jù)
???array(&$this, 'write'),??// 此方法在腳本結(jié)束和使用session_write_close()強制提交SESSION數(shù)據(jù)時執(zhí)行
???array(&$this, 'destroy'),?// 在運行session_destroy()時執(zhí)行
???array(&$this, 'gc')???// 執(zhí)行概率由session.gc_probability 和 session.gc_divisor的值決定,時機是在open,read之后,session_start會相繼執(zhí)行open,read和gc
??);
??session_start(); // 這也是必須的,打開session,,必須在session_set_save_handler后面執(zhí)行
?}
?/**
? * session_set_save_handler open方法
? *
? * @param $savePath
? * @param $sessionName
? * @return true
? */
?public function open($savePath, $sessionName) {
??return true;
?}
?/**
? * session_set_save_handler close方法
? *
? * @return bool
? */
?public function close() {
??return $this->gc($this->lifetime);
?}
?/**
? * 讀取session_id
? *
? * session_set_save_handler read方法
? * @return string 讀取session_id
? */
?public function read($sessionId) {
??$condition = array(
???'where' => array(
????'session_id' => $sessionId
???),
???'fields' => 'data'
??);
??$row = $this->db->fetchFirst($condition);
??return $row ? $row['data'] : '';
?}
?/**
? * 寫入session_id 的值
? *
? * @param $sessionId 會話ID
? * @param $data 值
? * @return mixed query 執(zhí)行結(jié)果
? */
?public function write($sessionId, $data) {
??$userId = isset($_SESSION['userId']) ? $_SESSION['userId'] : 0;
??$roleId = isset($_SESSION['roleId']) ? $_SESSION['roleId'] : 0;
??$grouId = isset($_SESSION['grouId']) ? $_SESSION['grouId'] : 0;
??$m = defined('ROUTE_M') ? ROUTE_M : '';
??$c = defined('ROUTE_C') ? ROUTE_C : '';
??$a = defined('ROUTE_A') ? ROUTE_A : '';
??if (strlen($data) > 255) {
???$data = '';
??}
??$ip = get_ip();
??$sessionData = array(
???'session_id'?=> $sessionId,
???'user_id'??=> $userId,
???'ip'???=> $ip,
???'last_visit'?=> SYS_TIME,
???'role_id'??=> $roleId,
???'group_id'??=> $grouId,
???'m'????=> $m,
???'c'????=> $c,
???'a'????=> $a,
???'data'???=> $data,
??);
??return $this->db->insert($sessionData, 1, 1);
?}
?/**
? * 刪除指定的session_id
? *
? * @param string $sessionId 會話ID
? * @return bool
? */
?public function destroy($sessionId) {
??return $this->db->delete(array('session_id' => $sessionId));
?}
?/**
? * 刪除過期的 session
? *
? * @param $lifetime session有效期(單位:秒)
? * @return bool
?*/
?public function gc($lifetime) {
??$expireTime = SYS_TIME - $lifetime;
??return $this->db->delete("`last_visit`
?}
}
在系統(tǒng)文件的某個地方,實例化這個類即可!
復(fù)制代碼 代碼如下:
new SessionMysql();

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.

The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.

To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X

1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.

PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.

PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.

PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway

Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.
