wp_get_original_referer(): string|false

Source

 * Retrieves original referer that was posted, if it exists.
 *
 * @since 2.0.4
 *
 * @return string|false Original referer URL on success, false on failure.
 */
function wp_get_original_referer() {
	// Return early if called before wp_validate_redirect() is defined.
	if ( ! function_exists( 'wp_validate_redirect' ) ) {
		return false;
	}

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