TWIG的 tests 学习_PHP教程

{{ var is odd }} 
 
{{ var is odd }} 
 
 
 
 
sameas
 检查变量的地址是否相同
 
{% if foo.attribute is sameas(false) %} 
 the foo attribute really is the ``false`` PHP value 
 {% endif %} 
 {% if foo.attribute is sameas(false) %}
 the foo attribute really is the ``false`` PHP value
 {% endif %}
 
 
 
constant
 检查变量的值是否相同
 
{% if post.status is constant('Post::PUBLISHED') %} 
 the status attribute is exactly the same as Post::PUBLISHED 
 {% endif %} 
 {% if post.status is constant('Post::PUBLISHED') %}
 the status attribute is exactly the same as Post::PUBLISHED
 {% endif %}
 
 
 
defined
 测试变量是否定义
 
{# defined works with variable names #} 
 {% if foo is defined %} 
 ... 
 {% endif %} 
 
 {# and attributes on variables names #} 
 {% if foo.bar is defined %} 
 ... 
 {% endif %} 
 
 {% if foo['bar'] is defined %} 
 ... 
 {% endif %} 
 {# defined works with variable names #}
 {% if foo is defined %}
 ...
 {% endif %}
 
{# and attributes on variables names #}
 {% if foo.bar is defined %}
 ...
 {% endif %}
 
{% if foo['bar'] is defined %}
 ...
 {% endif %}
 
 
 
empty
 测试变量是否为空，empty的意思是：该变量已经定义，但他的值是 null false 或者是空字符串
 {# evaluates to true if the foo variable is null, false, or the empty string #} 
 {% if foo is empty %} 
 ... 
 {% endif %} 
 
 摘自 jiaochangyun的专栏
 
 http://www.bkjia.com/PHPjc/478456.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478456.htmlTechArticle做逻辑判断的。目前支持的有 divisibleby null even odd sameas constant defined empty divisibleby 检查是否能被整除 {% if loop.index is divisibleby(3) %} ... {% en... 
 

        

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