WP_Theme::_check_headers_property_has_correct_type( $headers )

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/**
 * Callback function for usort() to naturally sort themes by translated name.
 *
 * @since 3.4.0
 *
 * @param WP_Theme $a First theme.
 * @param WP_Theme $b Second theme.
 * @return int Negative if `$a` falls lower in the natural order than `$b`. Zero if they fall equally.
 *             Greater than 0 if `$a` falls higher in the natural order than `$b`. Used with usort().
 */
private static function _name_sort_i18n( $a, $b ) {

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