How To Accept Multiple Parameters in WordPress Filters

How To Accept Multiple Parameters in WordPress Filters

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This is for WordPress Plugin and Theme developers. Don’t read further if you are not one of them.
To get an extra argument in your filter (say for a ‘bloginfo’ filter) you have to specify not 2 but actually 4 as number of arguments in add_filter (read below for details). The returned data are: first argument, [...]

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