What are the best practices for troubleshooting connectivity issues with external hosts in PHP?

When troubleshooting connectivity issues with external hosts in PHP, it is important to check for common problems such as DNS resolution errors, firewall restrictions, or network configuration issues. To solve these problems, you can try using tools like ping or traceroute to diagnose the connectivity problem. Additionally, make sure that your PHP code is correctly configured to handle network requests and responses. 

// Example PHP code snippet to troubleshoot connectivity issues with an external host
$host = 'example.com';
$port = 80;

$connection = @fsockopen($host, $port, $errno, $errstr, 5);

if (!$connection) {
    echo "Error connecting to $host: $errstr ($errno)";
} else {
    echo "Connected to $host successfully!";
    fclose($connection);
}

Keywords

cURL DNS resolution firewall network timeout error handling

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