Description:
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The documentation of mysql_data_seek() reads :
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Row_number starts at 0. The  row_number should be a value in the range from 0 to mysql_num_rows - 1.
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However if the result set has returned 0 rows, a seek 0 will fail with an E_WARNING and FALSE returned. So, the documentation should read like :
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Row_number starts at 0. The  row_number should be a value in the range from 0 to mysql_num_rows - 1. However if the result set is empty (mysql_num_rows == 0) a seek to 0 will fail with  an warning and false will be returned from the function.
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Andrey