wp-includes/functions.php:2019Retrieves original referer that was posted, if it exists.
string|falsefunction wp_get_original_referer() { // Return early if called before wp_validate_redirect() is defined. if ( ! function_exists( 'wp_validate_redirect' ) ) { return false; } if ( ! empty( $_REQUEST['_wp_original_http_referer'] ) ) { return wp_validate_redirect( wp_unslash( $_REQUEST['_wp_original_http_referer'] ), false ); } return false;}Introduced in 2.0.4. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.