blocks|key|4156951|text|这可能是因为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4156952|你把它放在哪里了|4156953|services:
++product_store.twig.extension.debug:
++class:++++++++Twig_Extension_Debug
++tags:
+++++-+{+name:+'twig.extension'+}|code-block|syntax|javascript|4156954|它应该在您的绑定的config.yml中：|4156955|nameOfTheBoundle/Resources/config/config.yml|4156956|而不是在项目的config.yml中：|4156957|app/config/config.yml|4156958|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

It could be that the reason:

Where have you put the 

<pre><code>services:
 product_store.twig.extension.debug:
 class: Twig_Extension_Debug
 tags:
 - { name: 'twig.extension' }
</code></pre>

It should be in config.yml of your boundle in:

<pre><code>nameOfTheBoundle/Resources/config/config.yml
</code></pre>

and not in config.yml of the projeft in:

<pre><code>app/config/config.yml
</code></pre>

blocks|key|2316164|text|首先，"dump“实际上不是命令，而是它的"debug”。其次，您的配置语法有点混乱。它应该看起来像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2316165|services:
++++twig.extension.debug:
++++++++class:+Twig_Extensions_Extension_Debug
++++++++tags:
++++++++++++-+{+name:+twig.extension+}|code-block|syntax|javascript|2316166|然后你可以像这样在你的模板中使用它：{%25+debug+var+%25}+--+注意{%25%25}大括号。Debug不能在{{}}大括号内工作，因为它是一个标签而不是一个函数。|offset|length|style|CODE|BOLD|2316167|entityMap^0|0|0|I|F|11|19|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@$I|S|J|T|K|L]|$I|U|J|V|K|M]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

First, "dump" is not actually the command, its "debug". Second, your config syntax is a little messed up. It should look something like this:

<pre><code>services:
 twig.extension.debug:
 class: Twig_Extensions_Extension_Debug
 tags:
 - { name: twig.extension }
</code></pre>

Then you can use it in your templates like this: <code>{% debug var %}</code> -- Note the {%%} braces. Debug does not work within {{}} braces because its a TAG and not a FUNCTION.

blocks|key|2316191|text|后进先出的答案鼓励您使用debug标记，但是debug标记{%25+debug+product+%25}在Twig1.5中已被弃用，取而代之的是dump函数{{+dump(product)+}}。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2316192|从Symfony+Standard+Edition+2.0.9开始，要启用的正确扩展是Twig_Extension_Debug，并且应该添加到app/config/config_dev.yml中，以便它只在开发环境中加载：|2316193|services:
++++twig.extension.debug:
++++++++class:+Twig_Extension_Debug
++++++++tags:+[{+name:+'twig.extension'+}]|code-block|syntax|javascript|2316194|然后，您应该能够在模板中使用{{+dump(product)+}}。|2316195|如果问题仍然存在，您可以尝试几种方法：|2316196|2316197|使用php+app/console+container:debug+twig.extension.debug+--env=dev来确保依赖注入容器正确地提取您的服务定义。|ordered-list-item|2316198|2316199|服务的容器信息twig.extension.debug服务Id+twig.extension.debug类Twig_Extension_Debug标记-+twig.extension+()作用域容器公共是合成的否所需的文件-|2316200|为您的开发环境打开已编译的依赖项注入容器类，并搜索Twig_Extension_Debug以查看是否已定义任何其他服务来使用它。此文件位于app/cache/dev/appDevDebugProjectContainer.php|unordered-list-item|2316201|
|2316202|Ensure，参数%25kernel.debug%25为true。|2316203|2316204|请确保您使用的是Twig1.5或更高版本。|2316205|2316206|entityMap|0|LINK|mutability|MUTABLE|url|http://twig.sensiolabs.org/doc/extensions/debug.html|1|http://twig.sensiolabs.org/doc/functions/dump.html^0|C|5|M|5|T|J|1W|4|22|J|C|5|0|1W|4|1|0|17|K|1Z|P|0|0|E|J|0|0|0|2|1Q|0|0|0|P|K|1X|19|0|0|9|E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]]|D|@$9|1T|A|1U|1|1V]|$9|1W|A|1X|1|1Y]]|E|$]]|$1|F|3|G|5|6|7|1Z|8|@$9|20|A|21|B|C]|$9|22|A|23|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|24|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|25|8|@$9|26|A|27|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|28|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|29|8|@]|D|@]|E|$]]|$1|R|3|S|5|T|7|2A|8|@$9|2B|A|2C|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|2D|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|2E|8|@]|D|@]|E|$]]|$1|X|3|Y|5|Z|7|2F|8|@$9|2G|A|2H|B|C]|$9|2I|A|2J|B|C]]|D|@]|E|$]]|$1|10|3|11|5|6|7|2K|8|@]|D|@]|E|$]]|$1|12|3|13|5|Z|7|2L|8|@$9|2M|A|2N|B|C]]|D|@]|E|$]]|$1|14|3|11|5|6|7|2O|8|@]|D|@]|E|$]]|$1|15|3|16|5|Z|7|2P|8|@]|D|@]|E|$]]|$1|17|3|-4|5|6|7|2Q|8|@]|D|@]|E|$]]|$1|18|3|-4|5|6|7|2R|8|@]|D|@]|E|$]]]|19|$1A|$5|1B|1C|1D|E|$1E|1F]]|1G|$5|1B|1C|1D|E|$1E|1H]]]]

The answer from lifo encourages you to use the <a href="http://twig.sensiolabs.org/doc/extensions/debug.html" rel="noreferrer"><code>debug</code></a> tag, but the <code>debug</code> tag <code>{% debug product %}</code> was deprecated in Twig 1.5 and replaced with the <a href="http://twig.sensiolabs.org/doc/functions/dump.html" rel="noreferrer"><code>dump</code></a> function <code>{{ dump(product) }}</code>.

The proper extension to enable as of Symfony Standard Edition 2.0.9 is <code>Twig_Extension_Debug</code> and should be added to <code>app/config/config_dev.yml</code> so it is only loaded in the dev environment:

<pre><code>services:
 twig.extension.debug:
 class: Twig_Extension_Debug
 tags: [{ name: 'twig.extension' }]
</code></pre>

You should then be able to use <code>{{ dump(product) }}</code> in your templates.

If a problem still exists, you can try a few things:

<ol>
<li>Use <code>php app/console container:debug twig.extension.debug --env=dev</code> to ensure the dependency injection container is properly picking up your service definition.

<pre><code>[container] Information for service twig.extension.debug

Service Id twig.extension.debug
Class Twig_Extension_Debug
Tags
 - twig.extension ()
Scope container
Public yes
Synthetic no
Required File -
</code></pre></li>
<li>Open the compiled dependency injection container class for your dev environment and search for <code>Twig_Extension_Debug</code> to see if any other service was already defined to use it. This file lives at <code>app/cache/dev/appDevDebugProjectContainer.php</code></li>
<li>Ensure the parameter <code>%kernel.debug%</code> is true.</li>
<li>Ensure you're using Twig 1.5 or later.</li>
</ol>

blocks|key|2520747|text|被接受的答案对我不起作用。我所要做的就是在AppKernel中启用DebugBundle+(仅在开发/测试环境中)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2520748|$bundles[]+=+new+Symfony\Bundle\DebugBundle\DebugBundle();|code-block|syntax|javascript|2520749|就是这样。不需要注册任何服务。|2520750|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The accepted answer did not work for me. All I had to do was to enable the DebugBundle in AppKernel (in dev/test environments only):

<pre><code>$bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
</code></pre>

and that was it. No need to register any services.

I don't know why it shows this error

<pre><code>The function "dump" does not exist in twig file
</code></pre>

while I have already writen in <code>config.yml</code> file:

<pre><code>services:
product_store.twig.extension.debug:
 class: Twig_Extension_Debug
 tags:
 - { name: 'twig.extension' }
</code></pre>

and in twig file I try to dump with:

<pre><code>{{ dump(product) }}
</code></pre>

Why does the function `dump` not exist in twig file?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我不知道为什么它会显示这个错误The function "dump" does not exist in twig file虽然我已经在config.yml文件中写入：services:product_store.twig.extension.debug:    class: Twig_Extension_Debug ...

问为什么twig文件中不存在`dump`函数？
EN

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问为什么twig文件中不存在`dump`函数？EN