Check if a remote image file exists in WordPress

remote-image-file-exists.php

<?php

/**
 * Check if a remote image file exists.
 *
 * @param  string $url The url to the remote image.
 * @return bool        Whether the remote image exists.
 */
function km_remote_image_file_exists( $url ) {
	$response = wp_remote_head( $url );

	return 200 === wp_remote_retrieve_response_code( $response );
}