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`get_terms()` has historically required that a taxonomy be specified when querying terms. This requirement is related to the fact that terms could formerly be shared between taxonomies, making `$taxonomies` critical for disambiguation. Since terms can no longer be shared as of 4.4, it' s desirable to be able to query for terms regardless of what taxonomy they're in. Because it's now optional to pass taxonomies, it's no longer necessary to have `$taxonomies` as the first (and required) parameter for `get_terms()`. The new function signature is `get_terms( $args )`, where 'taxonomy' can (optionally) be passed as part of the `$args` array. This syntax is more consistent with functions like `get_users()` and `get_posts()`. We've maintained backward compatibility by always giving precedence to the old argument format. If a second parameter is detected, or if it's detected that the first parameter is a list of taxonomy names rather than an `$args` array, `get_terms()` will parse the function arguments in the legacy fashion. Props flixos90, swissspidy, DrewAPicture, boonebgorges. Fixes #35495. git-svn-id: https://develop.svn.wordpress.org/trunk@36614 602fd350-edb4-49c9-b593-d223f7449a82