问题描述
我尝试使用symfony 4中var-dumper捆绑包中的精彩转储函数，由于某种原因，我收到以下错误:
I tried to use the wonderful dump function from the var-dumper bundle in symfony 4 and for some reason I get the following error:
由于标题已经由"vendor \ symfony \ var-dumper \ Dumper \ AbstractDumper.php"在第181行发送，因此无法启动会话.
Failed to start the session because headers have already been sent by "vendor\symfony\var-dumper\Dumper\AbstractDumper.php" at line 181.
另外，当我尝试在树枝模板中使用{％dump foo％}标签时，我得到一个错误:
Additionally, when I try to use the {% dump foo %} tag in a twig template I get an error:
未知的转储"标签.
有人可以帮助我吗?
推荐答案
在本课程的评论中提到了一个名叫Simon Waldburger的人，他说安装调试"可以解决问题(对我来说已经解决了).该说明在下一堂课中.
A guy named Simon Waldburger mentioned in the lesson's comments that installing "debug" fixed the issue (it fixed it for me). The instruction was in the next lesson.
composer require debug --dev
iiirxs也是正确的，要在树枝文件中输出转储，请执行
iiirxs is also correct, to output dump in twig file, do
{{ dump(variable) }}
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