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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