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Output to the web page echo "<br />";

Output to the console echo "\r\n";

echo?'我是上一行';
echo?'<br?/>';?
echo?'我是下一行';

No line breaks? ? ? ?

echo '<pre>' -----Original format output, ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????. ##

echo '<br />';

That's it. Is there any problem?

But please note that you may want to increase the line spacing. Under normal circumstances, you do not use this method. You need to know your logic.

Like this

echo?'</br>';

Hello, do you think this tool is useful?