How can one troubleshoot and debug FTP connection problems in PHP, especially when encountering warnings or errors during the process?

When troubleshooting FTP connection problems in PHP, it is essential to check for common issues such as incorrect credentials, firewall restrictions, or passive mode settings. To debug the connection, you can enable error reporting, check for error messages using the FTP functions, and use try-catch blocks to handle exceptions gracefully. 

<?php

// Set up FTP connection
$ftp_server = 'ftp.example.com';
$ftp_user = 'username';
$ftp_pass = 'password';

// Enable error reporting
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Attempt to connect to FTP server
try {
    $conn_id = ftp_connect($ftp_server);
    $login_result = ftp_login($conn_id, $ftp_user, $ftp_pass);
    
    if (!$conn_id || !$login_result) {
        throw new Exception('FTP connection failed!');
    } else {
        echo 'Connected to FTP server successfully!';
    }
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage();
}

// Close FTP connection
ftp_close($conn_id);

?>

Keywords

FTP PHP troubleshooting debugging errors

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