Docs: Update return type

Author: vipul0425

plugins/webp-uploads/helper.php

@@ -432,10 +432,10 @@ function webp_uploads_should_generate_all_fallback_sizes(): bool {
  *
  * @since 2.2.0
  *
- * @param int    $attachment_id The ID of the attachment.
- * @param string $src           The original image src url.
- * @param string $mime          A mime type we are looking to get image url.
- * @return string|null Returns mime type image if available.
+ * @param int    $attachment_id  The ID of the attachment.
+ * @param string $src            The original image src url.
+ * @param string $mime           A mime type we are looking to get image url.
+ * @return non-empty-string|null Returns mime type image if available.
  */
 function webp_uploads_get_mime_type_image( int $attachment_id, string $src, string $mime ): ?string {
 	$metadata     = wp_get_attachment_metadata( $attachment_id );

plugins/webp-uploads/hooks.php

@@ -822,18 +822,19 @@ function webp_uploads_filter_block_background_images( $block_content, array $blo
 
 		$new_url = webp_uploads_get_mime_type_image( $attachment_id, $image_url, $target_mime );
 
-		if ( is_string( $new_url ) ) {
+		if ( ! is_string( $new_url ) ) {
+			continue;
+		}
 
-			$processor = new WP_HTML_Tag_Processor( $block_content );
-			while ( $processor->next_tag() ) {
-				$style = $processor->get_attribute( 'style' );
+		$processor = new WP_HTML_Tag_Processor( $block_content );
+		while ( $processor->next_tag() ) {
+			$style = $processor->get_attribute( 'style' );
 
-				if ( is_string( $style ) && str_contains( $style, 'background-image:' ) && str_contains( $style, $image_url ) ) {
-					$updated_style = str_replace( $image_url, $new_url, $style );
-					$processor->set_attribute( 'style', $updated_style );
-					$block_content = $processor->get_updated_html();
-					break 2;
-				}
+			if ( is_string( $style ) && str_contains( $style, 'background-image:' ) && str_contains( $style, $image_url ) ) {
+				$updated_style = str_replace( $image_url, $new_url, $style );
+				$processor->set_attribute( 'style', $updated_style );
+				$block_content = $processor->get_updated_html();
+				break 2;
 			}
 		}
 	}