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WP_Theme::_name_sort

Callback function for usort() to naturally sort themes by name.

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site_allowed_themes

This filter is documented in wp-includes/class-wp-theme.php

allowed_themes

Filters the array of themes allowed on the network.

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network_allowed_themes

Filters the array of themes allowed on the network.

WP_Theme::get_allowed

Returns array of stylesheet names of themes allowed on the site or network.

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theme_scandir_exclusions

Filters the array of excluded directories and files while scanning theme folder.