Description:
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Page: http://php.net/mysqli_query

The 'Return values' says:

Returns TRUE on success or FALSE on failure. For SELECT, SHOW, DESCRIBE or EXPLAIN mysqli_query() will return a result object. 

Maybe a better wording could be clearer, similar to that:

Returns FALSE on failure. If success, returns a result object for  SELECT, SHOW, DESCRIBE or EXPLAIN and TRUE for the rest of queries.

Disclaimer: I am not English native. ;)

Reproduce code:
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From manual page: mysqli.query#Return Values
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