How can one efficiently check if a server is online using PHP?

To efficiently check if a server is online using PHP, you can use the `fsockopen` function to establish a connection to the server. If the connection is successful, the server is online; otherwise, it is offline. 

function isServerOnline($server, $port) {
    $connection = @fsockopen($server, $port);
    if ($connection){
        fclose($connection);
        return true;
    } else {
        return false;
    }
}

// Usage
$server = 'example.com';
$port = 80;
if (isServerOnline($server, $port)) {
    echo 'Server is online';
} else {
    echo 'Server is offline';
}

Keywords

PHP server online check efficiency

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