PHP

laravel create many

    $allUser = [];
    foreach(entry_users as user){ 
        $allinterests[] = [
          'name'  => $user->name,
          'phone' => $user->phone,
        ];
    }
    // insert many rows
    User::insert($allUser);

laravel add many to many

You should pass an array of user IDs to the attach() method.

For convenience, attach and detach also accept arrays of IDs as input

Change your code to:

$team = AppTeam::findOrFail($request->team_id);
$team->teamMembers()->attach($request->members_id);

laravel many to many relationship

/*
users
    id - integer
    name - string

roles
    id - integer
    name - string

role_user
    user_id - integer
    role_id - integer
*/

class User extends Model
{
    /**
     * The roles that belong to the user.
     */
    public function roles()
    {
      /*To determine the table name of the relationship's intermediate 
      table, Eloquent will join the two related model names in 
      alphabetical order. However, you are free to override this 
      convention. You may do so by passing a second argument to the 
      belongsToMany method*/
        return $this->belongsToMany(Role::class,'role_user');
    }
}
//Defining The Inverse Of The Relationship

class Role extends Model
{
    /**
     * The users that belong to the role.
     */
    public function users()
    {
        return $this->belongsToMany(User::class);
    }
}

Laravel many to many

users
    id - integer
    name - string
 
roles
    id - integer
    name - string
 
role_user
    user_id - integer
    role_id - integer

one to many laravel

Suppose you have a Post model with a hasMany relationship with Comment. You may insert a Comment object related to a post by doing the following:

$post = Post::find(1);
$commentToAdd = new Comment(['message' => 'This is a comment.']);
$post->comments()->save($commentToAdd);