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I pasted it in the functions.php file of my child theme and it threw this error message before I could save it:
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Your PHP code changes were rolled back due to an error on line 271 of file wp-content/themes/kleo-child/functions.php. Please fix and try saving again.

syntax error, unexpected ‘$forum_id’ (T_VARIABLE), expecting ‘(‘

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Line 271 is:

if $forum_id = 18747 $reply_address = 'mlt-club@monalisa-twins.com' ;

The first item in the list of forums