Laravel中with（）和compact（）有什么区别

Question

What's the difference between the functions with() and compact() in Laravel in these two examples:

Example 1:

return View::make('books.index')->with('booksList', $booksList);

Example 2:

return View::make('books.index',compact('booksList'));

Answer 1

Well compact() is a PHP function that converts a list of variables into an associative array where the key is the variable name and the value the actual value of that variable.

The actual question should be: What is the difference between

return View::make('books.index')->with('booksList', $booksList);

and

return View::make('books.index', array('booksList' => $booksList));

The answer there isn't really one. They both add items to the view data.

Syntax-wise, View::make() only accepts an array while with() takes both, two strings:

with('booksList', $booksList);

Or an array that can possibly hold multiple variables:

with(array('booksList' => $booksList, 'foo' => $bar));

This also means that compact() can be used with with() as well:

return View::make('books.index')->with(compact($booksList));

Answer 2

The compact method passes array data to Constructor which is stored to $data Class attribute :

public function __construct(Factory $factory, EngineInterface $engine, $view, $path, $data = array())
    {
        $this->view = $view;
        $this->path = $path;
        $this->engine = $engine;
        $this->factory = $factory;

        $this->data = $data instanceof Arrayable ? $data->toArray() : (array) $data;
    }

While with() method accepts an array or a string, and in case it is an array it performs array_merge on the parameter otherwise it appends the data to a key which you passed as a paramter to $data attribute, so if you use constructor you're forced to pass an array , while with() accepts a single key with a value.

public function with($key, $value = null)
    {
        if (is_array($key))
        {
            $this->data = array_merge($this->data, $key);
        }
        else
        {
            $this->data[$key] = $value;
        }

        return $this;
    }