php implements login function

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引用:PHP即“超文本预处理器”，是在服务器端执行的脚本语言，尤其适用于Web开发并可嵌入HTML中。PHP语法学习了C语言，吸纳Java和Perl多个语言的特色发展出自己的特色语法，并根据它们的长项持续改进提升自己，例如java的面向对象编程，该语言当初创建的主要目标是让开发人员快速编写出优质的web网站。 PHP同时支持面向对象和面向过程的开发，使用上非常灵活。

经过二十多年的发展，随着php-cli相关组件的快速发展和完善，PHP已经可以应用在 TCP/UDP服务、高性能Web、WebSocket服务、物联网、实时通讯、游戏、微服务等非 Web 领域的系统研发。

我们开发php网站需要配置apache、mysql,利用集成环境开发网站，例如小皮面板、xampp等集成环境,现在我们利用PHP来做一个登录功能

前端页面：login.php

 

?>

 

 

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Backend code: public/login.php

include_once 'server.php';

$user=$_GET['username'];

$pwd=$_GET['password'] ;

$sql="select * from user where user=$user and password=$pwd";

$result=$conn->query($sql);

if($result->num_rows>0){

$row=$result->fetch_assoc();//Get an array from the result set

echo json_encode( $row);//Convert to json format

session_start();

$_SESSION['name']=$user;

echo "

window.location.href='../index.php?user=' $user;

";

}

else{

echo "

alert('Account password is incorrect' );

window.location.href='../login.php';

";

}

$ result->free_result();

$conn->close();

?>

This code will take out the data if the login is successful. Failure will result in an incorrect account and password

Sever.php:

$servername="localhost";

$username='root ';

$password='123456';

$dbname='shop_center';

$conn=new mysqli($servername,$username,$password,$ dbname);

mysqli_set_charset($conn,'utf8');

if($conn->connect_error){

die(" Connection failed: ".$conn->connect_error);

}

//echo "Connection successful";

?>

This The code segment is the database connection code

Database creation statement

/*

Navicat MySQL Data Transfer

Source Server : stu1

Source Server Version : 50505

Source Host : localhost:3306

Source Database : shop_center

Target Server Type : MYSQL

Target Server Version : 50505

File Encoding : 65001

Date: 2021-04-29 18:57:52

*/

SET FOREIGN_KEY_CHECKS=0;

------------------ -----------

-- Table structure for `dingdan`

------------------ -----------

DROP TABLE IF EXISTS `dingdan`;

CREATE TABLE `dingdan` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`shopname` varchar(50) DEFAULT NULL,

`price` decimal(8,2) DEFAULT NULL,

`jieshao` varchar(50 ) DEFAULT NULL,

`img` int(11) DEFAULT NULL,

`count` int(11) DEFAULT NULL,

`sum` int(11) DEFAULT NULL,

`address` varchar(50) DEFAULT NULL,

`name` varchar(25) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

------------------------ -------

-- Records of dingdan

------------------------ ----

INSERT INTO `dingdan` VALUES ('4', 'Facial cleanser', '50.00', 'Very easy to use facial cleanser', '1', '1', null, null , '123');

-----------------------------------

-- Table structure for `gouwuche`

-- ----------------------------

DROP TABLE IF EXISTS `gouwuche`;

CREATE TABLE `gouwuche` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`shopname` varchar(25) DEFAULT NULL,

`price` decimal(8,2) DEFAULT NULL,

`jieshao` varchar(50) DEFAULT NULL,

`img` int(2) DEFAULT NULL,

`count` int(10) DEFAULT NULL,

`name` varchar(20) DEFAULT NULL,

`address` varchar( 50) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;

-- ----------------------------

-- Records of gouwuche

-- --- -----------------------

INSERT INTO `gouwuche` VALUES ('13', 'Facial Cleanser', '50.00' , 'A very useful facial cleanser', '1', '10', '123', null);

INSERT INTO `gouwuche` VALUES ('14', 'Skin care lotion', '60.00' , 'Soft skin, shiny and moisturized', '2', '3', '123', null);

INSERT INTO `gouwuche` VALUES ('15', 'Huawei mobile phone', '5000.00' , 'High quality, curved screen, fast refresh, no lag', '7', '2', '123', null);

-- ----- -----------------------

-- Table structure for `shop`

-- ----- -----------------------

DROP TABLE IF EXISTS `shop`;

CREATE TABLE `shop` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`shopname` varchar(25) DEFAULT NULL,

`price` decimal(8,2) DEFAULT NULL,

`jieshao` varchar(50) DEFAULT NULL,

`img` int(2) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;

----------------------- ---

-- Records of shop

--------------------------------

INSERT INTO `shop` VALUES ('1', 'Facial cleanser', '50.00', 'Very easy to use facial cleanser', '1');

INSERT INTO `shop ` VALUES ('2', 'skin lotion', '60.00', 'soft skin, radiant and moisturizing', '2');

INSERT INTO `shop` VALUES ('3', 'headphones' , '50.00', 'Bluetooth headset, long standby', '3');

INSERT INTO `shop` VALUES ('4', 'High-quality headset', '100.00', 'Clear sound quality, High-quality lossless sound quality', '4');

INSERT INTO `shop` VALUES ('5', 'Slippers', '20.00', 'Durable and very comfortable', '5');

INSERT INTO `shop` VALUES ('6', 'Mobile phone', '980.00', 'Fast refresh, two minutes of charging, two hours of talk time', '6');

INSERT INTO `shop` VALUES ('7', 'Huawei mobile phone', '5000.00', 'High quality, curved screen, fast refresh, no lag', '7');

INSERT INTO `shop` VALUES ('8', 'Conditioner', '50.00', 'Moisturize the scalp, protect the hair, and make the bald head look long and flowing', '8');

INSERT INTO `shop` VALUES (' 9', 'iPhone', '5000.00', 'High quality, Apple brings you a different experience', '9');

INSERT INTO `shop` VALUES ('10', 'Luggage Box', '280.00', 'Silent wheel, strong load-bearing capacity, wear-resistant', '10');

INSERT INTO `shop` VALUES ('11', 'Toothpaste', '18.00', ' Contains tea polyphenols to whiten teeth', '11');

INSERT INTO `shop` VALUES ('12', 'Sensodyne Toothpaste', '28.00', 'Prevent tooth sensitivity and whiten teeth, Prevent gum bleeding', '12');

---------------------------- --

-- Table structure for `user`

---------------------------- --

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`user` varchar(25) DEFAULT NULL,

`password` varchar(25) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

-------------------------------

-- Records of user

-----------------------------

INSERT INTO `user` VALUES ('1', '123', '123');

INSERT INTO `user` VALUES ('2', '', '');

INSERT INTO `user` VALUES ('3', '12121', '212');

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