uopz_set_hook Sets hook to execute when entering a function or method &reftitle.description; booluopz_set_hook stringfunction Closurehook booluopz_set_hook stringclass stringfunction Closurehook Sets a hook to execute when entering a function or method. &reftitle.parameters; class The name of the class. function The name of the function or method. hook A closure to execute when entering the function or method. &reftitle.returnvalues; &return.success; &reftitle.examples; ]]> &example.outputs; &reftitle.seealso; uopz_get_hook uopz_unset_hook