wp-includes/class-wp-dependencies.php:535Get etag header for cache validation.
$loadstring[]string public function get_etag( $load ) { /* * Note: wp_get_wp_version() is not used here, as this file can be included * via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case * wp-includes/functions.php is not loaded. */ global $wp_version; $etag = "WP:{$wp_version};"; foreach ( $load as $handle ) { if ( ! array_key_exists( $handle, $this->registered ) ) { continue; } $ver = $this->registered[ $handle ]->ver ?? $wp_version; $etag .= "{$handle}:{$ver};"; } /* * This is not intended to be cryptographically secure, just a fast way to get * a fixed length string based on the script versions. As this file does not * load the full WordPress environment, it is not possible to use the salted * wp_hash() function. */ return 'W/"' . md5( $etag ) . '"'; }Introduced in 6.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-dependencies.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.