Analysis of Basic Design Ideas and Implementation Methods of mvc Framework Imitating tp by PHP
- 2021-10-11 17:57:32
- OfStack
In this paper, the basic design idea and implementation method of mvc framework based on PHP imitating tp are described. Share it for your reference, as follows:
Basic Design and Simple Implementation of tp mvc
1: File loading knowledge
Variable constant function class
File loading functions or use namespaces:
require();
require_once();
include();
include_once();
Constant:
define("DEFINE","");
const constant = "value";
Function:
function fun(){}
//global Use global variables. Local variables are not called externally.
Class:
<?php
class A{
public $a = 10;
public function aa(){ // Can't be used 1 A a Because, new A After Method a Will be executed automatically, so the method name cannot conflict with the class name.
echo $this->a; // Output attribute .
}
public function __construct(){ // Construct method, which is automatically executed after instantiation,
echo $this->bb(); // Invoke the method.
}
public function bb(){
echo " I am bb";
}
}
$a = new A;
$a->aa();
class B extends A{ // Inheritance A , Class A Is a class B The parent of the. Inheritance public Of,
}
$b = new B;
$b->aa(); // You can output classes A The attributes inside.
For factory model, see: https://www.ofstack.com/article/140658. htm
//----------------------------- Factory model -------------------------//
class A{
public $class; // public $class = $_GET['c']; // Class name
public $method; // public $method = $_GET['m']; // Method
public function __construct($class,$method){
// Or through $_SERVER['PATH_INFO']; Transform to get the class name or method name (explained below).
$this->class = ucfirst(strtolower($class)).'Controller'; // Secure the class name and add the controller suffix
$this->method = strtolower($method); // Secure processing of method names
$this->work($this->class,$this->method);
}
public function work($class,$method){
// Name the file (Class name .class.php You can find the file by the class name.
//include ' File name (file is somewhere else) '; # For example include './index.php'; Introduces a file and instantiates the class.
$c = new $class; // Instantiate class
$c->$method(); // Access the methods of the class
}
}
At this point, we can solve it through the $_GET parameter of url
For example: http://mvc.com/index.php? h = home & v=Index & c=index.html
h is the front and back office, v is the controller, and c is the template.
$v = $_GET['v'];
$c = rtrim($_GET['c'],".html");
new A($v,$c); // Load the file again according to the inheritance relationship.
// extract($arr); //extract The role of: from the array will be imported into the current symbol table, key variables, values do values!
// compact(); // - Establish 1 An array of variables, including variable names and their values
// assign display Refer to the implementation: https://www.ofstack.com/article/140661.htm
class Controller{
public $array;
public $key;
public $val;
public function assign($key,$val){
if(array($val)){
$this->array["$key"] = $val;
}else{
$this->array["$key"] = compact($val);
}
}
public function display($tpl = ''){ // Templates are automatically loaded when they are empty.
$this->assign($this->key,$this->val);
extract($this->array);
// If the template is empty, it is here according to get Parameter or through the $_SERVER['PATH_INFO']; Convert to. (Explained below)
if(file_exists($tpl)){ // Load the file when the template exists.
include $tpl;
}
}
}
// Total inheritance model . This model Name and controller model The name is 1 Like it. Inheritance method is the same as Controller , total model It must be added 1 A return . Data processing indexmodel Can be added return , or not.
class IndexModel extends Model{
public function index(){
// Data processing.
// If you need to return data, add it return .
}
}
class IndexController extends Controller{ // Inheritance
public function index(){
$m = Model("index");
echo ' Instantiated index Method <br>';
$this->assign('m',$m); // Allocate data.
$this->display('index.html'); // Template
}
}
Although mvc is realized, it is not humanized enough, because get parameters are added every time, which becomes very lengthy. The key to solve this problem lies in
$_SERVER['PATH_INFO'];
Replace the h m v 3 parameters with this.
1. When the input url is: http://mvc.com/index.php/home/index/index.html
In this case, index. apache after the php slash will automatically be considered as a path.
$_SERVER['PATH_INFO'] = /home/index/index.html
1st slash/home front and back
2nd slash/index controller
Slash 3/index. html template file
If a parameter is added after it, such as:? a=18
&
b=38 He will not be added to $_SERVER ['PATH_INFO']. Neither $_ POST nor $_ GET will add the contents of $_ SERVER ['PATH_INFO'], so that the control parameters and data parameters do not conflict with each other.
2. Implementation of U method. Rewrite
$_SERVER['PATH_INFO']
Parameter, changed to 1 data.
array( 'home', 'Index', 'index');
Each entry file index. php converts its PHP_INFO parameter into an array, which is simply called in the controller or elsewhere.
// If the case conversion is done here, it will not be used in the master controller.
function bca(){
$arr = explode('/',ltrim($_SERVER['PATH_INFO'],'/'));
if(count($arr) == 3){
$arr[0] = strtolower($arr[0]);
$arr[1] = ucfirst(strtolower($arr[1]));
// Determine whether the suffix is .html
if(substr($arr[2],-5,strlen($arr[2])) == '.html'){
$a = explode('.',$arr['2']);
$arr[2] = strtolower($a[0]);
}else{
$arr[2] = strtolower($arr[2]);
}
$_SERVER['PATH_INFO'] = $arr;
}
}
// url Method to do the jump of controller or front and back office. No. 1 3 Is the parameter output or return . The default is direct output.
function U($string = '',$method = '',$bool = true){ // true Is directly output or returned,
// Gets the system variable.
$path_info = $_SERVER['PATH_INFO'];
$script_name = $_SERVER['SCRIPT_NAME'];
// Judge whether there is any in the middle / To determine the number of parameters.
if(strpos($string,'/')){
$arr = explode('/',$string);
if(count($arr) == 2){ // The case of two parameters.
$arr[0] = ucfirst(strtolower($arr[0]));
$arr[1] = strtolower($arr[1]);
$url = "/{$path_info[0]}/{$arr[0]}/{$arr[1]}.html";
}else if(count($arr) == 3){ // 3 Parameters.
$arr[0] = strtolower($arr[0]);
$arr[1] = ucfirst(strtolower($arr[1]));
$arr[2] = strtolower($arr[2]);
$url = "/{$arr[0]}/{$arr[1]}/{$arr[2]}.html";
}
}else{
$arr = strtolower($string); // 1 Parameters.
$url = "/{$path_info[0]}/{$path_info[1]}/{$arr}.html";
}
// url Splicing of paths.
if($method != ''){
$u = $script_name.$url.'?'.$method;
if($bool == true){ echo $u; }else{ return $u; }
}else{
$u = $script_name.$url;
if($bool == true){ echo $u; }else{ return $u; }
}
}
3. Rewrite url, remove index. php
Open the apache configuration file rewrite module, LoadModule rewrite_module modules/mod_rewrite. so
Overwrite file added under root. htaccess
Content:
<IfModule mod_rewrite.c>
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php/$1 [QSA,PT,L]
</IfModule>
Enter url in the browser: http://mvc.com/home/index/index.html? a=19b=38
[REDIRECT_STATUS] =
>
200 override state ok.
Discover
require_once();0
And
$_SERVER['PATH_INFO'];
Parameters are the same. Therefore, the security problem of index. php can be removed after the parameter.
4. Template replacement (idea)
We will find that there is a template we wrote with {$arr} in it < include file="" / > After reading the template file, we convert it into a normal php file through regularization and string. Encrypt the file name and put it in the folder after replacement. Check whether there is a cache file every time url accesses, judge the last modification time and other verification.
5. Data caching (ideas)
json_encode()
json_decode()
file_get_contents()
file_put_contents();
unserialize();
serialize();
memcache redis and so on.
For more readers interested in PHP related content, please check the topics on this site: "Introduction to php Object-Oriented Programming", "Encyclopedia of PHP Array (Array) Operation Skills", "Introduction to PHP Basic Grammar", "Summary of PHP Operation and Operator Usage", "Summary of php String (string) Usage", "Introduction to php+mysql Database Operation Skills" and "Summary of php Common Database Operation Skills"
I hope this paper is helpful to everyone's PHP programming.