wp-includes/class-wp-theme-json.php:1996Function that scopes a selector with another one. This works a bit like SCSS nesting except the & operator isn't supported.
$scopestring$selectorstringstring public static function scope_selector( $scope, $selector ) { if ( ! $scope || ! $selector ) { return $selector; } $scopes = explode( ',', $scope ); $selectors = explode( ',', $selector ); $selectors_scoped = array(); foreach ( $scopes as $outer ) { foreach ( $selectors as $inner ) { $outer = trim( $outer ); $inner = trim( $inner ); if ( ! empty( $outer ) && ! empty( $inner ) ) { $selectors_scoped[] = $outer . ' ' . $inner; } elseif ( empty( $outer ) ) { $selectors_scoped[] = $inner; } elseif ( empty( $inner ) ) { $selectors_scoped[] = $outer; } } } $result = implode( ', ', $selectors_scoped ); return $result; }Introduced in 5.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-theme-json.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.