Helen Hou-Sandí 69ccab3405 Introduce an expanded meta registration API. ...

`register_meta()` has been altered to accept an array of arguments as the third parameter in order to support its usage beyond XML-RPC, notably in the REST API and other projects that may build on top of meta, such as a potential Fields API. Arguments are whitelisted to reserve the right for core to add more later.

New functions added to complement this expansion are:
* `registered_meta_key_exists()`
* `unregister_meta_key()`
* `get_registered_meta_keys()`
* `get_registered_metadata()`
* A "private" function for the aforementioned whitelisting.

There still need to be lots of tests written for previous and new behaviors, and many things are subject to change. Maybe things will explode. #yolo

props jeremyfelt, ericlewis, sc0ttkclark, helen, rmccue, ocean90, voldemortensen.
see #35658.

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git-svn-id: http://core.svn.wordpress.org/trunk@37865 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-06-30 01:02:29 +00:00

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