I've been having trouble getting the number of rows to return using mysqli. I just get 0 back every time even though there are definitely some results.
if($stmt = $mysqli->prepare("SELECT id, title, visible, parent_id FROM content WHERE parent_id = ? ORDER BY page_order ASC;")){
$stmt->bind_param('s', $data->id);
$stmt->execute();
$num_of_rows = $stmt->num_rows;
$stmt->bind_result($child_id, $child_title, $child_visible, $child_parent);
while($stmt->fetch()){
//code
}
echo($num_of_rows);
$stmt->close();
}
Why doesn't it show the correct number?
You need to call mysqli_stmt::store_result()
prior to the num_rows lookup:
if($stmt = $mysqli->prepare("SELECT id, title, visible, parent_id FROM content WHERE parent_id = ? ORDER BY page_order ASC;")){
$stmt->bind_param('s', $data->id);
$stmt->execute();
$stmt->store_result(); <-- This needs to be called here!
$num_of_rows = $stmt->num_rows;
$stmt->bind_result($child_id, $child_title, $child_visible, $child_parent);
while($stmt->fetch()){
//code
}
echo($num_of_rows);
$stmt->close();
}
See the docs on mysqli_stmt::num_rows
, it says it right near the top of the page (in the main description block).
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