`常量`

constant 检查变量是否具有与常量完全相同的值。您可以使用全局常量或类常量

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        {% if post.status is constant('Post::PUBLISHED') %}
    the status attribute is exactly the same as Post::PUBLISHED
{% endif %}
    

您也可以从对象实例测试常量

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        {% if post.status is constant('PUBLISHED', post) %}
    the status attribute is exactly the same as Post::PUBLISHED
{% endif %}
    