This filter hook is applied to the translated text by the internationalization function that handle contexts (_x(), _ex(), esc_attr_x() and esc_html_x()).
IMPORTANT: This filter is always applied even if internationalization is not in effect, and if the text domain has not been loaded. If there are functions hooked to this filter, they will always run. This could lead to a performance problem.
For regular translation functions such as _e(), and for examples on usage, see gettext().
For singular/plural aware translation functions such as _n(), see ngettext().
For context-specific translation functions that also handle plurals such as _nx(), see filter hook ngettext_with_context().
User Contributed Notes