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.

$image resource|GdImage|false Required

A value to check the type for.

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

File: wp-includes/media.php. View all references

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

	return false;
}