MySQLi num_rows returns 0 - php

Question

Here's my code
$stmt = $conn->mysqli->stmt_init();
$stmt = $conn->mysqli->prepare('SELECT Username, EmailVerified, Blocked FROM user WHERE Email = ? AND SLANumber = ? AND Password = ?');
$stmt->bind_param('ssb', $_POST['EmailID'], $_POST['SLANumber'], $_POST['Password']);
$stmt->execute();
$stmt->store_result();
$result = $stmt->get_result();
if($result->num_rows == 0){
echo 'No rows found';
}
else{
// Continue processing here
.....
}
The code always echoes No rows found. A day or two before, it was working fine.
As expected, running the query directly gives the desired result.
What's wrong with the code?

Answer 1

Don't use store_result and get_result together in the same statement.
Use store_result method with "num_rows", "bind_result" and "fetch".
For get_result method, use "affected_rows" and "fetch_array". You can still use the "num_rows" property in the income get_result method as shown below.
$stmt->execute();
// $stmt->store_result();
$result = $stmt->get_result();
if(result->num_rows == 0){
...
}
OR
$stmt->execute();
// $stmt->store_result();
$result = $stmt->get_result();
if($stmt->affected_rows == 0){
...
}

Answer 2

To fix your problem remove this line:
$stmt->store_result();
The problem is that you used two methods which are in conflict with each other.
$stmt->store_result();
$result = $stmt->get_result();
Both of these methods fetch the results. store_result() fetches the results internally and stores them in the statement object. I would advise to avoid this method whenever possible. It is difficult to use. get_result() fetches the results and saves them in a separate object. Once the results are fetched from MySQL, they cannot be fetched again. Use only one of these methods at a time.
In your case you first stored the results in mysqli_stmt and then fetched an empty result set into $result. $result will contain 0 rows, because all of the records have already been stored in the statement. To get the number of rows stored there use $stmt->num_rows.
Both mysqli_stmt and mysqli_result classes have the num_rows property. The key is to use the appropriate one.

Answer 3

num_rows is a property of mysqli_stmt, not of a result resource. So you should be doing:
$result = $stmt->get_result();
// Also check strict comparison against int 0,
// to avoid incorrect equality with boolean FALSE
if($stmt->num_rows === 0){
echo 'No rows found';
}