Title: is_gd_image
Published: December 9, 2020
Last modified: February 24, 2026

---

# is_gd_image( resource|GdImage|false $image ): bool

## In this article

 * [Description](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#description)
 * [Parameters](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#wp--skip-link--target)

Determines whether the value is an acceptable type for GD image functions.

## 󠀁[Description](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#description)󠁿

In PHP 8.0, the GD extension uses GdImage objects for its data structures.
This 
function checks if the passed value is either a GdImage object instance or a resource
of type `gd`. Any other type will return false.

## 󠀁[Parameters](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#parameters)󠁿

 `$image`resource|GdImage|falserequired

A value to check the type for.

## 󠀁[Return](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#return)󠁿

 bool True if `$image` is either a GD image resource or a GdImage instance, false
otherwise.

## 󠀁[Source](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#source)󠁿

    ```php
    function is_gd_image( $image ) {
    	if ( $image instanceof GdImage
    		|| is_resource( $image ) && 'gd' === get_resource_type( $image )
    	) {
    		return true;
    	}

    	return false;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/media.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/media.php#L4120)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/media.php#L4120-L4128)

## 󠀁[Related](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#related)󠁿

| Used by | Description | 
| [image_edit_apply_changes()](https://developer.wordpress.org/reference/functions/image_edit_apply_changes/)`wp-admin/includes/image-edit.php` |

Performs group of changes on Editor specified.

  | 
| [load_image_to_edit()](https://developer.wordpress.org/reference/functions/load_image_to_edit/)`wp-admin/includes/image.php` |

Loads an image resource for editing.

  | 
| [wp_load_image()](https://developer.wordpress.org/reference/functions/wp_load_image/)`wp-includes/deprecated.php` |

Load an image from a string, if PHP supports it.

  | 
| [WP_Image_Editor_GD::load()](https://developer.wordpress.org/reference/classes/wp_image_editor_gd/load/)`wp-includes/class-wp-image-editor-gd.php` |

Loads image from $this->file into new GD Resource.

  | 
| [WP_Image_Editor_GD::resize()](https://developer.wordpress.org/reference/classes/wp_image_editor_gd/resize/)`wp-includes/class-wp-image-editor-gd.php` |

Resizes current image.

  | 
| [WP_Image_Editor_GD::_resize()](https://developer.wordpress.org/reference/classes/wp_image_editor_gd/_resize/)`wp-includes/class-wp-image-editor-gd.php` |  | 
| [WP_Image_Editor_GD::crop()](https://developer.wordpress.org/reference/classes/wp_image_editor_gd/crop/)`wp-includes/class-wp-image-editor-gd.php` |

Crops Image.

  | 
| [WP_Image_Editor_GD::rotate()](https://developer.wordpress.org/reference/classes/wp_image_editor_gd/rotate/)`wp-includes/class-wp-image-editor-gd.php` |

Rotates current image counter-clockwise by $angle.

  | 
| [WP_Image_Editor_GD::flip()](https://developer.wordpress.org/reference/classes/wp_image_editor_gd/flip/)`wp-includes/class-wp-image-editor-gd.php` |

Flips current image.

  | 
| [wp_imagecreatetruecolor()](https://developer.wordpress.org/reference/functions/wp_imagecreatetruecolor/)`wp-includes/media.php` |

Creates a new GD image resource with transparency support.

  |

[Show 5 more](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#)
[Show less](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#)

## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/is_gd_image/?output_format=md#changelog)󠁿

| Version | Description | 
| [5.6.0](https://developer.wordpress.org/reference/since/5.6.0/) | Introduced. |

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