Symfony 4:Var-dumper 无法正常工作 [英] Symfony 4: Var-dumper not working properly

问题描述

我尝试在 symfony 4 中使用 var-dumper 包中出色的转储功能，但由于某种原因，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:

无法启动会话，因为标头已由vendorsymfonyvar-dumperDumperAbstractDumper.php"在第 181 行发送.

Failed to start the session because headers have already been sent by "vendorsymfonyvar-dumperDumperAbstractDumper.php" at line 181.

此外，当我尝试在树枝模板中使用 {% dump foo %} 标记时，我收到一个错误:

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.

有人可以帮我吗?

推荐答案

一个名叫 Simon Waldburger 的人在课程评论中提到安装调试"解决了这个问题(它为我解决了这个问题).说明在下一课.

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 twig 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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