WordPress FTP Filesystem Modifications

Overview

This README documents the modifications made to the class-wp-filesystem-ftpext.php file to handle errors related to FTP connections. Specifically, we have added checks to ensure that FTP functions are only called when a valid FTP connection is available.

Modifications

1. FTP Connection Checks

We added checks before calling any FTP functions to ensure that the FTP connection ($this->link) is valid. These checks prevent functions from being called with a null or invalid FTP connection, which was causing fatal errors.

2. Error Logging

Whenever an FTP function is attempted with an invalid connection, an error is logged to help with debugging and monitoring.

Modified Functions

• cwd()
• chdir($dir)
• chmod($file, $mode = false, $recursive = false)
• get_contents($file)
• put_contents($file, $contents, $mode = false)
• exists($path)
• is_file($file)
• is_dir($path)
• mtime($file)
• size($file)
• delete($file, $recursive = false, $type = false)
• copy($source, $destination, $overwrite = false, $mode = false)
• move($source, $destination, $overwrite = false)
• dirlist($path = '.', $include_hidden = true, $recursive = false)

Example of Added Check

Here is an example of the added check in the cwd() function:

public function cwd() {
    if ($this->link && get_resource_type($this->link) === 'ftp') {
        $cwd = ftp_pwd($this->link);
        if ($cwd) {
            $cwd = trailingslashit($cwd);
        }
        return $cwd;
    } else {
        error_log('FTP connection is null or invalid.');
        return false;
    }
}

Errors Encountered

1. ftp_nlist()

Error Message:

PHP Fatal error:  Uncaught TypeError: ftp_nlist(): Argument #1 ($ftp) must be of type FTP\Connection, null given

Cause: This error occurs when ftp_nlist() is called with a null FTP connection.

Solution: Added a check before calling ftp_nlist() to ensure the connection is valid.

2. ftp_pwd()

Error Message:

PHP Fatal error:  Uncaught TypeError: ftp_pwd(): Argument #1 ($ftp) must be of type FTP\Connection, null given

Cause: This error occurs when ftp_pwd() is called with a null FTP connection.

Solution: Added a check before calling ftp_pwd() to ensure the connection is valid.

3. ftp_chdir()

Error Message:

PHP Fatal error:  Uncaught TypeError: ftp_chdir(): Argument #1 ($ftp) must be of type FTP\Connection, null given

Cause: This error occurs when ftp_chdir() is called with a null FTP connection.

Solution: Added a check before calling ftp_chdir() to ensure the connection is valid.

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