Lines:

<?php

if ( class_exists( 'WP_Image_Editor' ) ) :

/* class WP_Image_Editor_Mock */
/* function WP_Image_Editor_Mock::set_mime_type() – */
/* function WP_Image_Editor_Mock::load() – */
/* function WP_Image_Editor_Mock::test() – */
/* function WP_Image_Editor_Mock::supports_mime_type() – */
/* function WP_Image_Editor_Mock::resize() – */
/* function WP_Image_Editor_Mock::multi_resize() – */
/* function WP_Image_Editor_Mock::crop() – */
/* function WP_Image_Editor_Mock::rotate() – */
/* function WP_Image_Editor_Mock::flip() – */
/* function WP_Image_Editor_Mock::save() – */
/* function WP_Image_Editor_Mock::stream() – */
/* function WP_Image_Editor_Mock::get_size */

endif;
 

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