Description:
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From manual page: http://www.php.net/mysqli.insert-id
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The documentation for mysqli insert_id is wrong. It says that function will return zero if query was not INSERT or UPDATE but in fact it will return the last inserted ID. The function seems to be just a wrapper for http://php.net/manual/en/function.mysql-insert-id.php where the documentation is correct and even warns that the value is NOT reset after each query.

See discussion: http://stackoverflow.com/questions/29526374/mysqli-insert-id-still-returning-a-value-even-after-select-queries

Test script:
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See: http://stackoverflow.com/questions/29526374/mysqli-insert-id-still-returning-a-value-even-after-select-queries

Expected result:
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It should state the same as docs for mysql_insert_id()