Twig's tags learning (Chinese) Part 1_PHP tutorial

Twig is a simple yet powerful template. I’m learning SF so take a look at her.

The source of this article is http://twig.sensiolabs.org/doc/tags/index.html

Currently supported tags include

for if macro filter set extends block include import from use spaceless autoescape raw flush do

twig is divided into 3 types in html

{{...}} directly outputs the variables

{#...#} comment tag

{%...%} command tags are what we need to learn

for tag
This is the simplest, it is a loop.

Array-based loop

Members

{% for user in users %}
                                                                                                       {% endfor %}

Members

{% for user in users %}
                                                                                                        {% endfor %}

For loops based on numbers, special attention should be paid to the fact that 0-10, which is 11 numbers, will be output here.

{% for i in 0..10 %}

* {{ i }}

{% endfor %}
{% for i in 0..10 %}
* {{ i }}
{% endfor %}

Letter-based loop

{% for letter in 'a'..'z' %}

* {{ letter }}
{% endfor %}
{% for letter in 'a'..'z' %}
* {{ letter }}
{% endfor %}
Variables inside the loop body

loop.length, loop.revindex, loop.revindex0, loop.last These values ​​are only valid when the loop is a PHP array or a class that implements the Countable interface.

Add a condition
Unlike PHP, break and continue statements are not supported inside loops. You can only skip some loops through filters, like this

{% for user in users if user.active %}
                                                                                                       {% endfor %}

{% for user in users if user.active %}
                                                                                                        {% endfor %}

else branch

If users is an empty array, no user found will be output.

{% for user in users %}

                                                                                                                {% else %}
                                                                                                      {% endfor %}

{% for user in users %}
                                                                                                          {% else %}
                                                                                {% endfor %}

Loop by keys

Members

{% for key in users|keys %}

                                                                                                          {% endfor %}

Members

{% for key in users|keys %}
                                                                                                        {% endfor %}

Loop by keys, values

Members

{% for key, user in users %}
                                                                                                                     {% endfor %}

Members

{% for key, user in users %}
                                                                                   {% endfor %}

if tag
Needless to say, just look at the example {% if users %}

{% for user in users %}
                                                                                                                                                      {% endfor %}

{% endif %}

{% if kenny.sick %}

Kenny is sick.

{% elseif kenny.dead %}
You killed Kenny! You bastard!!!
{% else %}
Kenny looks okay --- so far
{% endif %}
{% if users %}

            {% for user in users %}
                                                       
• {{ user.username|e }}

           {% endfor %}

{% endif %}

{% if kenny.sick %}
Kenny is sick.
{% elseif kenny.dead %}
You killed Kenny! You bastard!!!
{% else %}
Kenny looks okay --- so far
{% endif %}

macro tag

Macro (macro tag) is similar to functions in other languages ​​and is often used to fill in html tags. The following is an example to render

{% macro input(name, value, type, size) %} 
     
{% endmacro %} 
{% macro input(name, value, type, size) %}
   
{% endmacro %}
macro与函数的不同之处在于：

1、参数的默认值是通过macro块内部的 default过滤器来定义的。

2、参数总是可选的。

另外，就跟php函数一样，macro内部是无法使用外部的变量的。但你可以传递一个特殊变量_context作为参数来获取整个内容。

macro可以被定义在任何的模板内，但在你使用之前需要使用 imported

{% import "forms.html" as forms %} 
{% import "forms.html" as forms %}然后就可以这样使用了

{{ forms.input('username') }}

 

{{ forms.input('password', null, 'password') }}

 

{{ forms.input('username') }}

{{ forms.input('password', null, 'password') }}

如果你要在定义macro的模板里使用，就不需要imported 可以使用特殊变量_self

{{ _self.input('username') }}

 

{{ _self.input('username') }}

如果你要定义一个macro里 包含另一个macro，并且两个macro在同一个文件里，可以使用特殊变量_self

{% macro input(name, value, type, size) %} 
   
{% endmacro %} 
 
{% macro wrapped_input(name, value, type, size) %} 
   

 
        {{ _self.input(name, value, type, size) }} 
   

 
{% endmacro %} 
{% macro input(name, value, type, size) %}
 
{% endmacro %}

{% macro wrapped_input(name, value, type, size) %}
   

        {{ _self.input(name, value, type, size) }}
   

{% endmacro %}
如果两个macro在不同的文件里，你需要使用import

{# forms.html #} 
 
{% macro input(name, value, type, size) %} 
   
{% endmacro %} 
 
{# shortcuts.html #} 
 
{% macro wrapped_input(name, value, type, size) %} 
    {% import "forms.html" as forms %} 
   

 
        {{ forms.input(name, value, type, size) }} 
   

 
{% endmacro %} 
{# forms.html #}

{% macro input(name, value, type, size) %}
 
{% endmacro %}

{# shortcuts.html #}

{% macro wrapped_input(name, value, type, size) %}
    {% import "forms.html" as forms %}
   

        {{ forms.input(name, value, type, size) }}
   

{% endmacro %}

filter tag
Just apply a filter to the entire block

{% filter upper %}
This text becomes uppercase
{% endfilter %}
{% filter upper %}
This text becomes uppercase
{% endfilter %}
{% filter lower|escape %}
SOME TEXT
{% endfilter %}

Excerpted from jiaochangyun’s column

http://www.bkjia.com/PHPjc/478461.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/478461.htmlTechArticleTwig is a simple and powerful template, because I am learning SF, so take a look at her. Source of this article http://twig.sensiolabs.org/doc/tags/index.html Currently supported tags include for if macro filter...