Linux-why should I add a backslash to the command for compiling PHP?

{Code ...}

. /Configure -- prefix =/usr/local/fastphp \ -- with-mysql = mysqlnd \ -- enable-mysqlnd \ -- with-gd \ -- enable-gd-native-ttf \ -- enable -gd-jis-conv -- enable-fpm

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. /Configure -- prefix =/usr/local/fastphp \ -- with-mysql = mysqlnd \ -- enable-mysqlnd \ -- with-gd \ -- enable-gd-native-ttf \ -- enable -gd-jis-conv -- enable-fpm

This is a line break.

That's the line feed of C.
The C language statement ends with a hyphen (;), not in the unit of action. Therefore, the C code format is flexible. You can wrap a line in the middle of the code that can be separated by spaces, only in the macro definition can the statement be too long and it is too long to be written into a row, which is not easy to view. You can use \ to resume the line at a space interval under normal circumstances.