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.

Return

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

Usage

is_gd_image( $image );

$image(resource|GdImage|false) (required)

A value to check the type for.

Changelog

Code of is_gd_image() is gd image ^{WP 5.7}

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

	return false;
}