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Initializing the `WP_Locale` array properties to an empty array at the class definition point. Why?
* Ensure the properties initialize to an `array` data type at instantiation (rather than `null`).
This initialization is needed to ensure the properties are not `null` if another class inherits from `WP_Locale` but does not run `WP_Locale::init()` from the constructor. In this case, the initialization prevents
{{{
Warning: array_values() expects parameter 1 to be array, null given
}}}
when Core uses any of the properties.
* Good design practice.
The code and documentation are clearly expecting these properties to be an `array` data type. Setting each to a default `array()` state further helps to clearly communicate the code design.
Follow-up to [37889], [36292], [31078], [3676], [6589].
Props tyxla, SergeyBiryukov, azaozz, hellofromTonya, mukesh27.
See #57427.
git-svn-id: https://develop.svn.wordpress.org/trunk@55047 602fd350-edb4-49c9-b593-d223f7449a82
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