


Create database php code and use PHP to write your own BLOG system_PHP tutorial
Directly enter the code below
//date_default_timezone_set("Asia/ Shanghai");
/*
function create_siteinfo
DONE: Website information table
Author: www.5dkx.com
DATE:2010-3-30
Table structure:
title website name
keyword website keyword
description website description
*/
function create_siteinfo()
{
global $conn;
$sql = "create table siteinfo (
title varchar(100) not null,
keyword varchar(200) not null,
description varchar(200) not null
)";
$dropsql = "drop table if exists siteinfo";
mysql_query($dropsql,$conn)or die("Failed to delete table siteinfo!");
mysql_query($sql,$conn)or die("Failed to create table siteinfo!");
}
/*
function:create_article()
DONE: mysql creates article table sql statement
Author: www.5dkx.com
Table structure:
id article ID
cid category ID
abstract article abstract
title article title
posttime release time
aurhor author
comefrom article source
comeurl source URL
content text content
keyword keyword
rank article rank
views views
*/
function create_article()
{
global $conn,$table_article;
$sql ="create table $table_article(
id int(11) auto_increment not null,
cid int(5) not null,
abstract varchar(300) not null,
title varchar(50) not null,
posttime datetime not null,
author varchar(30) not null,
comefrom varchar(50) not null,
comeurl varchar(50) not null,
content TEXT not null,
keyword varchar(20) not null,
rank int(2) not null,
views int(5) not null,
PRIMARY KEY(id)
)";
$dropsql = "drop table if exists $table_article";
mysql_query($dropsql,$conn)or die("Failed to delete database!");
mysql_query($sql,$conn)or die("Failed to create database!" ");
}
/*
function:create_member()
DONE: mysql creates member table sql statement
Author:www.5dkx.com
uid member ID
u_name member name
u_passwd password
rank member level
*/
function create_member()
{
global $conn,$table_member;
$sql = "create table $ table_member(
uid int(5) auto_increment not null,
u_name varchar(20) not null UNIQUE,
u_passwd varchar(100) not null,
rank int(2) not null,
PRIMARY KEY(uid)
)";
$dropsql = "drop table if exists $table_member";
mysql_query($dropsql,$conn)or die("Failed to delete database!");
mysql_query($sql,$conn)or die("Failed to create database!");
}
/*
function:create_class
DONE:sql creates a classified sql statement
Author :www.5dkx.com
Table structure:
cid class category ID
cname class name
*/
function create_class()
{
global $conn,$table_class ;
$sql = "create table $table_class(
cid int(5) auto_increment not null,
cname varchar(50) not null UNIQUE,
PRIMARY KEY(cid)
)" ;
$dropsql = "drop table if exists $table_class";
mysql_query($dropsql,$conn)or die("Delete".$table_class."Failed!");
mysql_query($sql ,$conn)or die("Create table".$table_class."Failed");
}
/*
function:create_guest
DONE:sql Create message board sql statement
Author :www.5dkx.com
Table structure:
gid message ID
g_name message user name
g_site user personal homepage
g_mail user email
g_cid message location (which article or Message board)
*/
function create_guest()
{
global $conn,$table_guest;
$sql = "create table $table_guest(
gid int(11) auto_increment not null,
g_name varchar(50) not null,
g_site varchar(50) not null,
g_mail varchar(50) not null,
g_cid int(5) not null,
PRIMARY KEY(gid)
)";
$dropsql = "drop table if exists $table_guest";
mysql_query($dropsql,$conn)or die("delete table".$table_guest." failed ");
mysql_query($sql,$conn)or die("Create table".$table_guest."Failed");
}
function create_sql()
{
global $ table_article,$table_member,$table_class,$table_guest,$conn;
echo "Create siteinfo table r...";
create_siteinfo();
echo "Complete
";
echo "Create".$table_article."Table r...";
create_article();
echo "Complete
";
echo "Create".$table_member."Table r..." ;
create_member();
echo "Complete
";
echo "Create".$table_class."Table r...";
create_class();
echo " Complete
";
echo "Create".$table_guest."Table r...";
create_guest();
echo "Complete
";
mysql_close($ conn);
}
?>

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


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