Evaluate arbitrary php code after bootstrapping Drupal (if available).
drush php-eval
code : PHP code
Sets the hello variable using Drupal API.
drush php-eval 'variable_set("hello", "world");'
Loads node with nid 1 and then prints its title.
drush php-eval '$node = node_load(1); print $node->title;'
Copies a file whose path is determined by an environment's variable. Note the use of double quotes so the variable $HOME gets replaced by its value.
drush php-eval "file_unmanaged_copy('$HOME/Pictures/image.jpg', 'public://image.jpg');"
Rebuild node access permissions.
drush php-eval "node_access_rebuild();"