What are the line breaks in php?

When writing PHP script code, we often see the two characters \n and
. They both have the function of breaking lines, so what exactly do they mean? What's the difference?

1, \n or \r\n, causes the source code to wrap, but the content displayed by the browser does not;

2,
causes the browser to display The content wraps, but the source code does not.

Example:

PHP code 1:

<?php
echo 0;
echo "\n";
echo 1;
?>

Browser display:

View source code:

PHP code 2:

<?php
echo 0;
echo "<br />";
echo 1;
?>

Browser display:

<?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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