About the linefeed that has predefined the variable PHP_EOL

Unfortunately, different operating systems have different Line breaks: unix \ n; windows \ r \ n; mac \ r. PHP provides the predefined variable PHP_EOL, it indicates a line break, which is changed according to the platform. If you want a line break

Unfortunately, line breaks vary with operating systems:\ N for unix; \ r \ n for windows; \ r for mac
Fortunately, PHP provides the predefined variable PHP_EOL, which represents a line break and will change according to the platform.
So what if line breaks are compatible with each operating system:

$ Str = str_replace (array ("\ r \ n", "\ r", "\ r \ n"), PHP_EOL, $ str );

You need to replace the character strings with line breaks!