Comparing ICU sort keys (collator_get_sort_key) in PHP

Is strcmp() appropriate for comparing ICU collator sort ke开发者_开发百科ys in PHP?

The sort keys I'm asking about are from collator_get_sort_key() which are described in ICU documentation.

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strcmp can be used if indeed it is just a binary comparison of the null terminated value.

http://userguide.icu-project.org/collation