Shows how to include the absolute URI for image files in a Participants Database CSV export

pdb-export-image-paths.php

<?php
/**
 * Plugin Name: PDB Export Absolute Image Paths
 * Description: Shows how to include the absolute path to image files in a CSV export
 * 
 */

class PDb_Image_Paths_Export {
  
  /**
   * @var PDb_Field_Item the field object
   */
  private $field;
  
  /**
   * sets up the filter
   */
  public function __construct()
  {
    add_filter( 'pdb-csv_export_value', array( $this, 'alter_export_values' ), 50, 2 );
  }
  
  /**
   * alters the CSV export values
   * 
   * @param string $value
   * @param PDb_Field_Item $field the field object
   * @return string the value
   */
  public function alter_export_values( $value, $field )
  {
    if ( $field->form_element() === 'image-upload' ) {
      $this->field = $field;
      $value = $this->image_path();
    }
    
    return $value;
  }
  
  /**
   * provides the absolute path to the image file
   * 
   * @return string the absolute path
   */
  private function image_path()
  {
    $image_object = $this->image_object();
    
    return $image_object->image_uri;
  }
  
  /**
   * provides the image object
   * 
   * @return PDb_Image instance
   */
  private function image_object()
  {
    return new PDb_Image( array(
        'filename' => $this->field->value(),
        'link' => $this->field->link(),
        'module' => $this->field->module(),
        'attributes' => $this->field->attributes(),
            ) );
  }
}

new PDb_Image_Paths_Export();

A CSV generated with this plugin active may not be successfully imported back into Participants Database, the plugin is expecting only the file name or media item slug, not a full path for the imported value.

This gist may not work when using the Image Expansion Kit, and certainly won't work for multi-image type fields, it is a demonstration of the simple case of a native Participant Database image field.