fileowner - PHP code example

PHP Function Fileowner

php function fileowner is a useful function that returns the user ID of the owner of a specific file. It takes a filename and the user ID, which is returned in numerical format. It is up to the user to use functions like posix_getpwuid() to convert this number to a user name. This function may not return the correct results on Windows systems.

PHP offers a variety of file functions that empower developers to interact with the file system, manipulate file content, and efficiently manage file operations. File functions like fopen(), fread(), and fclose() allow developers to open and read files, while file_get_contents() and file_put_contents() enable writing data to files. Meanwhile, file_exists() and unlink() facilitate file existence checks and deletion.

When handling inputs such as file names or paths, it’s important to ensure that they’re sanitized and validated to prevent malicious file access. Additionally, it’s a good practice to implement error checking so that any errors generated by file functions can be handled gracefully.

For example, when using fopen(), it’s recommended to set the file mode to “a+” (read and write). This will avoid any accidental overwriting of existing data. Similarly, when using the copy() function, it’s recommended to set the mode to “a+” (read and append). This will preserve the existing file content while appending new data at the end of the file. Furthermore, if you’re planning to perform multiple operations on a file or directory, it’s highly recommended to utilize atomic operations. Atomicity ensures that all changes to a file or folder are either successful or rollback in case of an error.

fileowner example

// This process is inherently difficult to test therefore use a state flag.     $test_authorize = FALSE;
    if (drupal_valid_test_ua()) {
      $test_authorize = \Drupal::state()->get('test_uploaders_via_prompt', FALSE);
    }
    // If the owner of the directory we extracted is the same as the owner of     // our configuration directory (e.g. sites/default) where we're trying to     // install the code, there's no need to prompt for FTP/SSH credentials.     // Instead, we instantiate a Drupal\Core\FileTransfer\Local and invoke     // update_authorize_run_install() directly.     if (fileowner($project_real_location) == fileowner($this->sitePath) && !$test_authorize) {
      $this->moduleHandler->loadInclude('update', 'inc', 'update.authorize');
      $filetransfer = new Local($this->root, \Drupal::service('file_system'));
      $response = call_user_func_array('update_authorize_run_install', array_merge([$filetransfer], $arguments));
      if ($response instanceof Response) {
        $form_state->setResponse($response);
      }
    }

    // Otherwise, go through the regular workflow to prompt for FTP/SSH     // credentials and invoke update_authorize_run_install() indirectly with     // whatever FileTransfer object authorize.php creates for us.

    /** * Gets the file owner. * * @since 2.7.0 * * @param string $file Path to the file. * @return string|false Username of the owner on success, false on failure. */
    public function owner( $file ) {
        $owneruid = @fileowner( $this->sftp_path( $file ) );

        if ( ! $owneruid ) {
            return false;
        }

        if ( ! function_exists( 'posix_getpwuid' ) ) {
            return $owneruid;
        }

        $ownerarray = posix_getpwuid( $owneruid );

    /** * Gets the file owner. * * @since 2.5.0 * * @param string $file Path to the file. * @return string|false Username of the owner on success, false on failure. */
    public function owner( $file ) {
        $owneruid = @fileowner( $file );

        if ( ! $owneruid ) {
            return false;
        }

        if ( ! function_exists( 'posix_getpwuid' ) ) {
            return $owneruid;
        }

        $ownerarray = posix_getpwuid( $owneruid );

if ( ! $method ) {

        $temp_file_name = $context . 'temp-write-test-' . str_replace( '.', '-', uniqid( '', true ) );
        $temp_handle    = @fopen( $temp_file_name, 'w' );
        if ( $temp_handle ) {

            // Attempt to determine the file owner of the WordPress files, and that of newly created files.             $wp_file_owner   = false;
            $temp_file_owner = false;
            if ( function_exists( 'fileowner' ) ) {
                $wp_file_owner   = @fileowner( __FILE__ );
                $temp_file_owner = @fileowner( $temp_file_name );
            }

            if ( false !== $wp_file_owner && $wp_file_owner === $temp_file_owner ) {
                /* * WordPress is creating files as the same owner as the WordPress files, * this means it's safe to modify & create new files via PHP. */
                $method                                  = 'direct';
                $GLOBALS['_wp_filesystem_direct_method'] = 'file_owner';
            } elseif ( $allow_relaxed_file_ownership ) {

'project' => $project,
          'updater_name' => get_class($updater),
          'local_url' => $project_real_location,
        ];
      }

      // If the owner of the last directory we extracted is the same as the       // owner of our configuration directory (e.g. sites/default) where we're       // trying to install the code, there's no need to prompt for FTP/SSH       // credentials. Instead, we instantiate a Drupal\Core\FileTransfer\Local       // and invoke update_authorize_run_update() directly.       if (fileowner($project_real_location) == fileowner($this->sitePath)) {
        $this->moduleHandler->loadInclude('update', 'inc', 'update.authorize');
        $filetransfer = new Local($this->root, \Drupal::service('file_system'));
        $response = update_authorize_run_update($filetransfer, $updates);
        if ($response instanceof Response) {
          $form_state->setResponse($response);
        }
      }
      // Otherwise, go through the regular workflow to prompt for FTP/SSH       // credentials and invoke update_authorize_run_update() indirectly with       // whatever FileTransfer object authorize.php creates for us.       else {