WordPress at a glance
function is not described

is_gd_image() WP 5.6.0

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

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

No Hooks.


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


is_gd_image( $image );
$image(resource|GdImage|false) (required)
A value to check the type for.


Since 5.6.0 Introduced.

Code of is_gd_image() WP 5.7

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

	return false;