模板

控制器布局

在Laravel框架中使用模板的一种方法就是通过控制器布局。通过在控制器中指定 layout 属性，对应的视图会被创建并且作为请求的默认返回数据。

在控制器中定义一个布局

class UserController extends BaseController {

    /**
     * The layout that should be used for responses.
     */
    protected $layout = 'layouts.master';

    /**
     * Show the user profile.
     */
    public function showProfile()
    {
        $this->layout->content = View::make('user.profile');
    }

}

Blade模板

Blade是Laravel框架下的一种简单又强大的模板引擎。 不同于控制器布局，Blade模板引擎由模板继承和模板片段驱动。所有的Blade模板文件必须使用Blade .blade.php 文件扩展名。

定义一个Blade布局

<!-- Stored in app/views/layouts/master.blade.php -->

<html>
    <body>
        @section('sidebar')
            This is the master sidebar.
        @show

        <div class="container">
            @yield('content')
        </div>
    </body>
</html>

使用一个Blade布局

@extends('layouts.master')

@section('sidebar')
    @parent

    <p>This is appended to the master sidebar.</p>
@stop

@section('content')
    <p>This is my body content.</p>
@stop

注意一个Blade布局的扩展视图简单地在布局中替换了模板片段。通过在模板片段中使用 @parent 指令，布局的内容可以被包含在一个子视图中，这样你就可以在布局片段中添加诸如侧边栏、底部信息的内容。

Sometimes, such as when you are not sure if a section has been defined, you may wish to pass a default value to the @yield directive. You may pass the default value as the second argument:

@yield('section', 'Default Content');

其他 Blade模板 控制结构

输出数据

Hello, {{ $name }}.

The current UNIX timestamp is {{ time() }}.

Echoing Data After Checking For Existence

Sometimes you may wish to echo a variable, but you aren't sure if the variable has been set. Basically, you want to do this:

{{ isset($name) ? $name : 'Default' }}

However, instead of writing a ternary statement, Blade allows you to use the following convenient short-cut:

{{ $name or 'Default' }}

Displaying Raw Text With Curly Braces

If you need to display a string that is wrapped in curly braces, you may escape the Blade behavior by prefixing your text with an @ symbol:

@{{ This will not be processed by Blade }}

Of course, all user supplied data should be escaped or purified. To escape the output, you may use the triple curly brace syntax:

Hello, {{{ $name }}}.

Note: Be very careful when echoing content that is supplied by users of your application. Always use the triple curly brace syntax to escape any HTML entities in the content.

If 声明

@if (count($records) === 1)
    I have one record!
@elseif (count($records) > 1)
    I have multiple records!
@else
    I don't have any records!
@endif

@unless (Auth::check())
    You are not signed in.
@endunless

循环

@for ($i = 0; $i < 10; $i++)
    The current value is {{ $i }}
@endfor

@foreach ($users as $user)
    <p>This is user {{ $user->id }}</p>
@endforeach

@while (true)
    <p>I'm looping forever.</p>
@endwhile

包含子视图

@include('view.name')

You may also pass an array of data to the included view:

@include('view.name', array('some'=>'data'))

Overwriting Sections

By default, sections are appended to any previous content that exists in the section. To overwrite a section entirely, you may use the overwrite statement:

@extends('list.item.container')

@section('list.item.content')
    <p>This is an item of type {{ $item->type }}</p>
@overwrite

输出多语言（Language Lines）

@lang('language.line')

@choice('language.line', 1);

注释

{{-- This comment will not be in the rendered HTML --}}

扩展 Blade

Blade even allows you to define your own custom control structures. When a Blade file is compiled, each custom extension is called with the view contents, allowing you to do anything from simple str_replace manipulations to more complex regular expressions.

The Blade compiler comes with the helper methods createMatcher and createPlainMatcher, which generate the expression you need to build your own custom directives.

The createPlainMatcher method is used for directives with no arguments like @endif and @stop, while createMatcher is used for directives with arguments.

The following example creates a @datetime($var) directive which simply calls ->format() on $var:

Blade::extend(function($view, $compiler)
{
    $pattern = $compiler->createMatcher('datetime');

    return preg_replace($pattern, '$1<?php echo $2->format(\'m/d/Y H:i\'); ?>', $view);
});