You can use PHP_EOL instead in PHP to improve the source code level portability of the code
Unix series (recommended learning:PHP programming from entry to proficiency)
\n
For Windows series
\r\n
For mac
\r
For example:
<?php
echo PHP_EOL;
//windows平台相当于 echo "\r\n";
//unix\linux平台相当于 echo "\n";
//mac平台相当于 echo "\r";
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