Shows how to add a placeholder to the Participants Database standard list search input (deprecated)

pdb-search-input-placeholder.php

<?php

/**
 * Plugin Name: PDb Standard Search Input Placeholder
 * Description: shows how to set a placeholder value in the standard list search input
 */
 
 add_filter( 'pdb-search_input_attributes', 'xnau_set_search_input_attributes' );
 
 /**
  * sets the search input attributes
  *
  * @param array $attributes
  * @return array attributes
  **/
  function xnau_set_search_input_attributes( $attributes )
  {
    $attributes['placeholder'] = 'enter your search words here...';
    
    return $attributes;
  }

This should be installed as a plugin.

How to Install a WordPress Plugin from a Gist

This is no longer needed as of Participants Database 2.5.6, you can now set this in the plugin settings.