wp-includes/class-wp-scripts.php:1157Gets the highest fetch priority for a given script and all of its dependent scripts.
$handlestring$checkedarrayoptionalarray()$stored_resultsarrayoptionalarray()string|null private function get_highest_fetchpriority_with_dependents( string $handle, array $checked = array(), array &$stored_results = array() ): ?string { if ( isset( $stored_results[ $handle ] ) ) { return $stored_results[ $handle ]; } // If there is a recursive dependency, return early. if ( isset( $checked[ $handle ] ) ) { return null; } // Mark this handle as checked to guard against infinite recursion. $checked[ $handle ] = true; // Abort if the script is not enqueued or a dependency of an enqueued script. if ( ! $this->query( $handle, 'enqueued' ) ) { return null; } $fetchpriority = $this->get_data( $handle, 'fetchpriority' ); if ( ! $this->is_valid_fetchpriority( $fetchpriority ) ) { $fetchpriority = 'auto'; } static $priorities = array( 'low', 'auto', 'high', ); $high_priority_index = count( $priorities ) - 1; $highest_priority_index = (int) array_search( $fetchpriority, $priorities, true ); if ( $highest_priority_index !== $high_priority_index ) { foreach ( $this->get_dependents( $handle ) as $dependent_handle ) { $dependent_priority = $this->get_highest_fetchpriority_with_dependents( $dependent_handle, $checked, $stored_results ); if ( is_string( $dependent_priority ) ) { $highest_priority_index = max( $highest_priority_index, (int) array_search( $dependent_priority, $priorities, true ) ); if ( $highest_priority_index === $high_priority_index ) { break; } } } } $stored_results[ $handle ] = $priorities[ $highest_priority_index ]; return $priorities[ $highest_priority_index ]; }Introduced in 6.9.0. Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/class-wp-scripts.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.