MDL-80985 core: Add --courses argument to purge_caches.php

admin/cli/purge_caches.php

@@ -31,6 +31,7 @@ require_once($CFG->libdir.'/clilib.php');
 $longoptions = [
     'help' => false,
     'muc' => false,
+    'courses' => false,
     'theme' => false,
     'lang' => false,
     'js' => false,
@@ -55,6 +56,8 @@ all caches will be purged.
 Options:
 -h, --help            Print out this help
     --muc             Purge all MUC caches (includes lang cache)
+    --courses         Purge all course caches (or only those specified by a comma-separated list).
+                      e.g. --courses=4,67,145
     --theme           Purge theme cache
     --lang            Purge language string cache
     --js              Purge JavaScript cache