Is there a supported way to add functions to functions.php? I'm assuming that editing the exiting file in my theme directory is a bad idea. Is there some convention for creating a file that the theme will pick up, or do I have to do the whole bit of creating a child theme to do this?
I'm not a PHP dev by any stretch... but looking through some other posts around here, yes, it seems like the Theme's functions.php file is the place to put custom stuff... you'll want to be sure and back it up prior to upgrading the theme though down the road as it will get overwritten when upgrading.
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You would need to create a child theme and make a functions.php file in it and i think it will work, or change the current functions.php file in the theme ...