Drupal-Debug-Hints.md

@@ -167,4 +167,11 @@ Source: https://stackoverflow.com/a/25975930
 
 ```
 sed -n '/^-- Current Database: `dbname`/,/^-- Current Database: `/p' alldatabases.sql > output.sql
+```
+
+# Clearing all caches (including opcache)
+
+```
+drush cr
+drush php:eval 'opcache_reset();'
 ```
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