In this article, we will discuss the mysqli_poll() function in PHP, which is used to poll connections.

Introduction to the mysqli_poll() function

The mysqli_poll() function is a built-in function in PHP that is used to poll connections. This function can be used to check if there is any data available on a connection before reading from it. The mysqli_poll() function can be used in conjunction with non-blocking I/O to make your application more responsive.

How to use the mysqli_poll() function

Using the mysqli_poll() function is straightforward. Here's an example:

<?php
$mysqli = new mysqli("localhost", "username", "password", "database");

if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: " . $mysqli->connect_error;
    exit();
}

$links = [$mysqli];
$processed = 0;
do {
    $links_ready = mysqli_poll($links, 10);
    if ($links_ready !== false) {
        foreach ($links_ready as $link) {
            if ($result = $link->reap_async_query()) {
                // process the result set
                $processed++;
            } else {
                // handle the error
            }
        }
    }
} while ($processed < count($links));

$mysqli->close();
?>

In this example, we first create a new MySQLi object using the mysqli() constructor. We then check if the connection was successful using the connect_errno property. If the connection was successful, we create an array of links that we want to poll, which contains only the $mysqli object. We then enter a loop that continues until all links have been processed. Inside the loop, we call mysqli_poll() with the array of links and a timeout value of 10 milliseconds. If there is data available on one or more of the links, mysqli_poll() returns an array of links that are ready to be processed. We then loop through the links that are ready to be processed and call the reap_async_query() method on each link to retrieve any data that is available. Finally, we increment the $processed counter and repeat the loop until all links have been processed.

Conclusion

In conclusion, the mysqli_poll() function is a powerful tool for polling connections in PHP. By understanding how to use the function, you can make your application more responsive and efficient when working with MySQL databases.

Practice Your Knowledge

What are the main steps involved in creating a simple poll using PHP?

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