PHP website design ideas

This article is about 《PHP and MySQL Web Development》 The first 5 edition 27 Summary of the project in Chapter .

1. Analyze the required functions

List the main functional modules ： Sign in 、 register 、 Forget the password 、 Reset password 、 Log out 、 Bookmark browsing 、 Bookmarks added 、 Bookmark deletion 、 Bookmark recommendation

Determine the sequential transfer relationship between modules ：

2. Disassemble the required modules

Separate the logic and content of the module ：

• The content is written in function_form.php in
• Logic is written in function.php in

Set up special files for ：

• Connect to database
• Input data verification
• User authentication
• Browser output

All documents of the project can be divided into the following categories ：

1. Data definition file ：bookmarks.sql

It is used to establish the required database and data table .

2. Database connection file ：db_fns.php

Used to connect to the database . Save the user name and password of the database user .

3. Input data validation file ：user_auth_fns.php

Used to verify input data . test POST Whether the value of the variable is empty ,email Whether the input is legal .

4. User authentication file ：user_auth_fns.php

Used to verify whether users can register 、 Sign in 、 Change Password 、 Reset password , And whether the user has logged in .

It is composed of several functions with corresponding functions , Function to receive parameters , Connect to the database for query , Return the query result or throw an exception .

5. Bookmark operation file ：url_fns.php

For bookmarking url The query 、 increase 、 Delete and recommend . The function implementation method is similar to the previous one .

6. Browser output file ：output_fns.php

Used to display all kinds of browser output ：

Page name 、 In page title 、 Various forms 、 On page URL、 Website information 、 User menu 、 footer .

Each function implements the browser output of a kind of part , Functions can receive parameters as needed , stay HTML Insert php Show , It can also be done through php Output HTML Elements .

7. A file that contains a set of frequently referenced files ：bookmark_fns.php

8.9. Form file and corresponding logic processing file

Form file	login.php	change_passwd_form.php	register_form.php	forgot_form.php	add_bm_form.php
Logic processing files	member.php	change_passwd.php	register_new.php	forgot_passwd.php	add_bms.php

Other logic processing files ：

delete_bms.php、recommend.php

logout.php

Characteristics of form file ：

1. Contains the bookmark_fns.php in output_fns.php References to functions in files （ That is, some browser output functions ）

2. For forms that can only be filled out after login , Contains the session start function session_start() And verify whether the user has registered the session function check_valid_user().

Characteristics of logical processing files ： Processing the data submitted by the form

1. Contains the bookmark_fns.php in output_fns.php References to functions in files （ That is, some browser output functions ）

2. Contains the session start function session_start().

3. receive POST Variable information .

4. Whether the form is filled 、 Judge whether the input is legal .

5. Then call the user authentication function , If the verification passes , The relevant information will be displayed .

6. Catch all exceptions thrown , Reasonable display on the browser .

3. Key ideas of main modules

1. Database connection module ：

Connect to database , return mysqli object .

function db_connect() {
    
    $db = new mysqli('localhost', 'username', 'password', 'database');
    if (!$db) {
    
       throw new Exception("Could not connect to database server");  
    }else {
    
        return $db;
    }
}

2. Input data verification module ：

// Verify that each variable has a value 
function filled_out($form_vars) {
    
    foreach ($form_vars as $key => $value) {
    
        if ((!isset($key)) || ($value == '')) {
    
            return false;
        } 
    } 
     return true;
}
// test email
function valid_email($address) {
    
  if(preg_match('/^[a-zA-Z0-9_\.\-][email protected][a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$/', $address)) {
    
    return true;
  } else {
    
    return false;
  }
}

3. User authentication module ：

Connect to the database first , The query statement is then executed （ It is best to use parameterized query methods ）, Return the corresponding value according to the query result .

function login($username, $password) {
    
    $conn = db_connect();
    $results = $conn -> query("select * from user where username = '".$username."' and passwd = sha1('".$password."')");
   if (!$results) {
    
        throw new Exception('Could not log you in.');
    }
    if ($results -> num_rows > 0) {
    
        return true;
    } else {
    
        throw new Exception('Could not log you in.');
    }
}

4. Login login module ：

// Login successful , Set up session
$_SESSION['valid_user'] = $username;
// Log out , Save the user name first , Write off again , Give different prompts by judging whether the user name exists 
$old_user = $_SESSION['valid_user'];
unset($_SESSION['valid_user']);
$result_dest = session_destroy();
if (!empty($old_user)) {
    
    if ($result_dest) {
    
        echo 'Logged out.<br />';
    }else {
    
        echo 'Could not log you out.<br />';
    }
}else {
    
    echo 'You are not logged in ,so have not been logged out.<br />';
}

5.url Recommended modules sql sentence ：

If two users collect the same URL, Then maybe they have similar hobbies , You can put one user's favorite other URL Recommend to another user .

bookmark There are two columns in the data table ,bm_URL and username.

$query = "select bm_URL from bookmark where username in (select distinct(b2.username) from bookmark b1, bookmark b2 where b1.bm_URL = b2.bm_URL and b1.username != b2.username and b1.username = '".$valid_user."') and bm_URL not in (select bm_URL from bookmark where b1.username = '".$valid_user."') group by bm_URL having count(bm_URL)>".$popularity;