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You are here: Home / PHP & MySQL: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given [duplicate]

PHP & MySQL: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given [duplicate]

October 8, 2021 by James Palmer

$dbc is returning false. Your query has an error in it:
SELECT users.*, profile.* –You do not join with profile anywhere.
FROM users
INNER JOIN contact_info
ON contact_info.user_id = users.user_id
WHERE users.user_id=3″);

The fix for this in general has been described by Raveren.

The query either returned no rows or is erroneus, thus FALSE is returned. Change it to
if (!$dbc || mysqli_num_rows($dbc) == 0)

mysqli_num_rows:

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

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