Php简介：
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
?>
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 "";
}
else{
echo "";
}
$ 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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