Automattic / jetpack

			$_image_url  = set_url_scheme( $image_url );

			if ( wp_startswith( $_image_url, $content_url ) ) {

				$_image_path = str_replace( $content_url, ABSPATH . 'wp-content', $_image_url );

				if ( file_exists( $_image_path ) ) {

					$filetype = wp_check_filetype( $_image_path );

					$ext = $filetype['ext'];

					$type = $filetype['type'];

					if ( wp_startswith( $type, 'image/' ) ) {

						$data = file_get_contents( $_image_path );

					}

				}

			}

			if ( empty( $data ) ) {

		}

		// If it's a local path in our WordPress install:

		if ( file_exists( $image_url ) ) {

			$filetype = wp_check_filetype( $image_url );

			$ext = $filetype['ext'];

			$type = $filetype['type'];

			if ( wp_startswith( $type, 'image/' ) ) {

				$data = file_get_contents( $image_url );

			}

		}

		// Now turn it into an image and return it.

		return imagecreatefromstring( $data );