Description:
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In the documentation of mysqli_fetch_row [http://www.php.net/manual/de/function.mysqli-fetch-row.php] says the summary the function returns NULL if ther is no more row, in the detail documentation is the return value for mo more rows FALSE.

Reproduce code:
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Returns an array that corresponds to the fetched row, or ***NULL*** if there are no more rows.

mysqli_fetch_row() fetches one row of data from the result set represented by result and returns it as an enumerated array, where each column is stored in an array offset starting from 0 (zero). Each subsequent call to the mysqli_fetch_row() function will return the next row within the result set, or ***FALSE*** if there are no more rows.