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Includes
Server Side Includes or SSI is a very simple programming language but it also
has a very limited number of instructions. We will consider only one option
SSI allows us to use within our asp scripts: include/virtual.
As we have the #include statement in C, we have the #include
directive here. The purpose is exactly similar: #INCLUDE actually includes
the said file at the given location. Any script that is present within that file is
automatically executed.
Include files are typically used to store application-wide functions and
procedures, as well as various utility functions, e.g. IsValidEmail (...) a
function that checks if a given string is a valid email address. You can put
such functions in just 1 file, and include that on each one of your pages.
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Or, you may use this functionality to insert headers & footers on every page.
Putting all the standard content in one file, you simply include that file in each
of your pages, so you do not need to copy & paste it everywhere. Updates are
easier too, since you can modify just one file and not worry about forgetting
to update another.
Another form of the INCLUDE directive uses the keyword virtual:
which will locate the file considering it as the virtual path. According to the
line above, the file is expected to be found at
www.domain.com/directory/file.inc
Note that the virtual path of the file above, is the one that is entered in the
#INCLUDE statement.
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