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php中header函数前面不能有输出语句

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php中header函数前面不能有输出语句

在我的印象里，设置header函数前面不能有任何echo print 等输出语句，否则会报错
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为什么我运行这段代码，正常运行？
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当我在代码前面关闭缓冲，才会报错
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没搞懂的是我都没有ob_start(),为什么一开始不会报错？现在php默认自动开启缓冲？求大佬解答，感谢


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https://www.php.net/manual/zh...

如果开启了 output_buffering 则会等到buffer写满之后才会向浏览器发送


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