PHP's db class library Eloquent uses series (8) alone - many-to-many association

CREATE TABLE users (
  id int(11) NOT NULL AUTO_INCREMENT,
  name varchar(50) NOT NULL DEFAULT '' COMMENT 'User name',
  age int(11) NOT NULL DEFAULT '0' COMMENT 'age',
  PRIMARY KEY (id)
);

CREATE TABLE roles (
  id int(11) NOT NULL AUTO_INCREMENT,
  name varchar(50) NOT NULL DEFAULT '' COMMENT 'Role name',
  PRIMARY KEY (id)
);

CREATE TABLE user_roles (
  id int(11) NOT NULL AUTO_INCREMENT,
  user_id int  NOT NULL DEFAULT 0 COMMENT '用户id',
  role_id int  NOT NULL DEFAULT 0 COMMENT '角色id',
  create_time int not null default 0 comment 'create time',
  PRIMARY KEY (id)
);

The source code
has a total of 3 files, the main program, the user model class, and the role model class. Note that there is no associated table model!
User.php

<?php
namespace app\model;
use \Illuminate\Database\Eloquent\Model;

/**
 * User model class
 */
class User extends Model
{
    protected $table = 'users';
    public $timestamps = false;
    
    public function roles()
    {
        // Important note: parameter 2 is the name of the association table, parameter 3 is the foreign key corresponding to this class in the association table, parameter 4 is the foreign key of parameter 1
        return $this->belongsToMany('app\model\Role', 'user_roles' , 'user_id', 'role_id')
            ->withPivot('create_time' );
    }
}

Role.php

<?php
namespace app\model;
use \Illuminate\Database\Eloquent\Model;

/**
 * Role model class
 */
class Role extends Model
{
    protected $table = 'roles';
    public $timestamps = false;
    
    public function users()
    {
        // Important note: parameter 2 is the name of the association table, parameter 3 is the foreign key corresponding to this class in the association table, parameter 4 is the foreign key of parameter 1
        return $this->belongsToMany('app\model\User', 'user_roles' , 'role_id', 'user_id')
            ->withPivot('create_time' );
    }
}

Main program:

<?php
namespace app\control;

use Illuminate\Database\Capsule\Manager;
use app\model\User;
use app\model\Role;

class Ill3
{
    /**
     * Main program.
     */
    public function index()
    {
        $db = new Manager ();
        $db->addConnection ( [
            'driver' => 'mysql',
            'host' => '127.0.0.1',
            'database' => 'test1',
            'username' => 'root',
            'password' => 'root',
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => ''
        ] );
        $db->setAsGlobal ();
        $db->bootEloquent ();
      
        $db::delete('delete from users ');
        $db::delete('delete from roles ');
        $db::delete('delete from user_roles ');
        
        $user = new User ();
        $user->name = 'User1';
        $user->id = 1;
        $user->save (); // new model added
        $user = new User ();
        $user->name = 'User2';
        $user->id = 2;
        $user->save (); // new model added
        
        $role = new Role();
        $role->id = 1;
        $role->name = 'Super Administrator';
        $role->save (); // new model added
        
        $role = new Role();
        $role->id = 2;
        $role->name = 'Administrator';
        $role->save (); // new model added
        
        $role = new Role();
        $role->id = 3;
        $role->name = 'Ordinary user';
        $role->save (); // new model added
        
        $db::table('user_roles')->insert([
            'user_id' => 1,
            'role_id' => 2,
            'create_time' => time(),
        ]);
        $db::table('user_roles')->insert([
            'user_id' => 1,
            'role_id' => 3,
            'create_time' => time(),
        ]);
        $db::table('user_roles')->insert([
            'user_id' => 2,
            'role_id' => 2,
            'create_time' => time(),
        ]);
        echo "<h2>All roles of user1</h2>";
        echo User::find(1)->roles->toJson(JSON_UNESCAPED_UNICODE);
        echo "<br>";
        
        echo "<h2>All users of role 2</h2>";
        echo Role::find(2)->users->toJson(JSON_UNESCAPED_UNICODE);
        echo "<br>";
        echo '<br>all ok！';
    }
}

Browser output

summary:

The field value of the intermediate table can be read through the pivot attribute
There is no need to build a model for the intermediate table
As before, methods are called without parentheses, and dynamic properties such as roles are called
toJson with parameters can avoid Chinese being encoded

PHP's db class library Eloquent uses series (8) alone - many-to-many association

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