Description:
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From manual page: http://www.php.net/mysqli-stmt.store-result
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The first note box states "...checking if mysqli_stmt_result_metadata() returns NULL" which it never does according to it's manual page (http://www.php.net/manual/en/mysqli-stmt.result-metadata.php): "Returns a result object or FALSE if an error occurred."

Expected result:
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...checking if mysqli_stmt_result_metadata() returns FALSE and mysqli_stmt_errno() returns 0.

Actual result:
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...checking if mysqli_stmt_result_metadata() returns NULL.