Collator::getSortKey collator_get_sort_key Get sorting key for a string &reftitle.description; &style.oop; public stringfalseCollator::getSortKey stringstring &style.procedural; stringfalsecollator_get_sort_key Collatorobject stringstring Return collation key for a string. Collation keys can be compared directly instead of strings, though are implementation specific and may change between ICU library versions. Sort keys are generally only useful in databases or other circumstances where function calls are extremely expensive. &reftitle.parameters; object Collator object. string The string to produce the key from. &reftitle.returnvalues; Returns the collation key for the string, &return.falseforfailure;. &return.falseproblem; &reftitle.examples; ]]> &example.outputs.similar; 3832404046010901dc08 &reftitle.seealso; collator_sort collator_sort_with_sort_keys