How do you retrieve multiple result sets from a stored procedure in PHP/mysqli?

Retrieving Multiple Result Sets with Stored Procedures in PHP/mysqli

In PHP/MySQLi, executing a stored procedure with multiple result sets requires careful handling. To advance to the second result set after executing the stored procedure, you must:

1. Use mysqli_stmt_execute: Execute the stored procedure using mysqli_stmt_execute.
2. Fetch the first result set: Call mysqli_stmt_get_result to obtain the first result set and read its data using fetch_assoc, fetch_array, or fetch_row.
3. Move to the next result set: After reading the first result set, call mysqli_stmt_next_result to move to the next result set.
4. Fetch the second result set: Call mysqli_stmt_get_result again to obtain the second result set and read its data.

Here's an example code using PHP/MySQLi:

<code class="php">$stmt = mysqli_prepare($db, 'CALL multiples(?, ?)');
mysqli_stmt_bind_param($stmt, 'ii', $param1, $param2);
mysqli_stmt_execute($stmt);

// Fetch the first result set
$result1 = mysqli_stmt_get_result($stmt);
while ($row = $result1->fetch_assoc()) {
    printf("%d\n", $row['id']);
}

// Move to the second result set
mysqli_stmt_next_result($stmt);
$result2 = mysqli_stmt_get_result($stmt);
while ($row = $result2->fetch_assoc()) {
    printf("%d\n", $row['id']);
}

mysqli_stmt_close($stmt);</code>

This code successfully retrieves and prints the data from both result sets in the specified stored procedure.

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