Ticket #43046: 43046.2.diff

src/wp-includes/media.php

@@ -284 +284 @@
 /**
  * Check if an image size exists.
  *
+ * By default, `has_image_size()` will return false for core image sizes. For
+ * this function to return true for core image sizes, pass a truthy value as
+ * the second parameter.
+ *
  * @since 3.9.0
+ * @since 5.0.0 Added support for including default image sizes by passing `true` to $include_default.
  *
- * @param string $name The image size to check.
+ * @param string $name            The image size to check.
+ * @param bool   $include_default Whether to include default image sizes.
  * @return bool True if the image size exists, false if not.
  */
-function has_image_size( $name ) {
+function has_image_size( $name, $include_default = false ) {
         $sizes = wp_get_additional_image_sizes();
+        if( $include_default ) {
+                $default_sizes = array(
+                        'thumbnail'    => true,
+                        'medium'       => true,
+                        'medium-large' => true,
+                        'large'        => true,
+                );
+                $sizes = array_merge( $sizes, $default_sizes );
+        }
         return isset( $sizes[ $name ] );
 }