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Add <pre>

<pre>{$content}</pre>

As shown in the picture

nl2br($str);

Convert the newline character to <br> and then store it in the database

The space (r) and newline character (n) in the textarea do not display labels in the database. You can use them when displaying the page

<pre>{$content}</pre>

But if a line of content is too long, it will not automatically wrap. You can also convert the textarea's line wrapping to

str_replace("\n", "<br>", $content4);

In this way, the output content will have line breaks.