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WP_Theme::exists

Whether the theme exists.

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WP_Theme::offsetGet

Method to implement ArrayAccess for keys formerly returned by get_themes().

WP_Theme::offsetExists

Method to implement ArrayAccess for keys formerly returned by get_themes()

WP_Theme::offsetSet

Method to implement ArrayAccess for keys formerly returned by get_themes()

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WP_Theme::offsetUnset

Method to implement ArrayAccess for keys formerly returned by get_themes()

WP_Theme::__toString

When converting the object to a string, the theme name is returned.

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WP_Object_Cache::_exists

Serves as a utility function to determine whether a key exists in the cache.