PHP 8.2: Default $example empty string rather than null #220

libs/oik-sc-help.php

@@ -618,10 +618,10 @@ function playlist__syntax( $shortcode="playlist" ) {
  * Note: The cached version may have been created for a different locale
  * In tests we might need to reset it by calling bw_expand_shortcode with null
  * 
- * @param string|null $example shortcode to be expanded
+ * @param string $example shortcode to be expanded. Cannot be null in PHP 8.2
  * @return string the generated HTML
  */
-function bw_expand_shortcode( $example=null ) {
+function bw_expand_shortcode( $example='' ) {
 	static $previous_example = null;
 	static $previous_expanded = null;
 	static $previous_locale = null; 
@@ -631,6 +631,7 @@ function bw_expand_shortcode( $example=null ) {
 	} else {
 		bw_save_scripts(); 
 		bw_push();
+
 		$expanded = apply_filters( 'the_content', $example );
 		bw_pop();
 		bw_save_scripts();