Your ajax script loads wp-load.php with this statement:
\nrequire_once ( dirname( dirname( dirname( dirname( __FILE__ ) ) ) ) . ‘\/wp-load.php’ );
\nThis fails if wp-content\/plugins has been moved to a non-standard location. I’ve extracted a few lines from the settings table to illustrate our set up below:
\nABSPATH\tWP absolute path.\t\/home\/lamp\/wordpress\/core\/wp5.2.1\/
\nWPPA_ABSPATH\tABSPATH windows proof\t\/home\/lamp\/wordpress\/core\/wp5.2.1\/
\nWPPA_PATH\tPath to plugins directory.\t\/home\/lamp\/wordpress\/wp-content\/www.otu.asn.au\/plugins\/wp-photo-album-plus
\nWPPA_NAME\tPlugins directory name.\twp-photo-album-plus
\nWPPA_URL\tPlugins directory URL.\thttps:\/\/www.otu.asn.au\/wp-content\/plugins\/wp-photo-album-plus
\nWPPA_UPLOAD\tThe relative upload directory.\twp-content\/www.otu.asn.au\/uploads
\nWPPA_UPLOAD_PATH\tThe upload directory path.\t\/home\/lamp\/wordpress\/core\/wp5.2.1\/wp-content\/www.otu.asn.au\/uploads\/wppa<\/p>\n
If I replace the above line with
\nrequire_once ( ‘\/home\/lamp\/webroot\/otu\/wp-load.php’ );
\nand in wp-config I add:
\ndefine(‘WPPA_REL_UPLOADS_PATH’, ‘wp-content\/www.otu.asn.au\/uploads’);
\ndefine(‘WPPA_REL_DEPOT_PATH’, ‘wp-content\/www.otu.asn.au’);
\nThen everything works.
\nSo you do have support for moving wp-content\/uploads but not support for moving the plugins directory.<\/p>\n
Our set up works with these redirects:
\n\tRewriteCond %{REQUEST_URI} !^\/wp-content\/www.otu.asn.au\/(.*)
\n\tRewriteCond %{REQUEST_URI} ^\/wp-content\/(.*)
\n\tRewriteRule ^\/wp-content\/(.*) \/wp-content\/%{SERVER_NAME}\/%1<\/p>\n
We have a large number of small WP websites sharing a server. They share WP core code and some common\/large plugins. All this optimises use of OPCache memory.<\/p>\n","protected":false},"template":"","class_list":["post-11679131","topic","type-topic","status-publish","hentry","topic-tag-plugins-directory","topic-tag-wp-load-php"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/11679131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/11679131\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=11679131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}