include multiple files with comma separated addresses

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External files DO NOT require http://

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included scripts have their own variables and do not use the main scripts variables

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You cannot include using $variables
Partly due to the parsing order
and partly to stop malicious use.

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Advanced users

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You can access the variables in included files
but scripts in included files cannot access the variables in the main script

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The variables in internal include files are accessed like this
@$var_name
The variables in external included files are accessed like this
your_site.xtgem.com@$var_name
If the $var_name is incorrect the text up to the $ will be displayed
You can get a list of the variables names by using the dump_vars function in the debugging tools

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To use external variables in {_$$var_name|default} you will have to reassign it to a local variable first