WP_Theme_JSON::remove_keys_not_in_schema( array $tree, array $schema ): array

Source

foreach ( array_keys( $styles_non_top_level ) as $section ) {
	// array_key_exists() needs to be used instead of isset() because the value can be null.
	if ( array_key_exists( $section, $styles_non_top_level ) && is_array( $styles_non_top_level[ $section ] ) ) {
		foreach ( array_keys( $styles_non_top_level[ $section ] ) as $prop ) {
			if ( 'top' === $styles_non_top_level[ $section ][ $prop ] ) {
				unset( $styles_non_top_level[ $section ][ $prop ] );
			}
		}
	}
}

// Build the schema based on valid block & element names.
$schema                 = array();
$schema_styles_elements = array();

/*
 * Set allowed element pseudo selectors based on per element allow list.
 * Target data structure in schema:
 * e.g.
 * - top level elements: `$schema['styles']['elements']['link'][':hover']`.
 * - block level elements: `$schema['styles']['blocks']['core/button']['elements']['link'][':hover']`.

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