Custom excerpt, Jean Michel

Custom-placeholder-Add-on.php

<?php
/*
Plugin Name: Custom-placeholder Add-on
Plugin URI: http://tiptoppress.com/downloads/term-and-category-based-posts-widget/
Description: Add-on to handle custom placeholder like custom fields for the premium widget Term and Category Based Posts Widget.
Author: TipTopPress
Version: 1.1
Author URI: http://tiptoppress.com
Installation:
- Download the file and rename it to Custom-placeholder-Add-on.php
- Upload it to the plugins folder [your-wordpress-installation]/wp-content/plugins/Custom-placeholder-Add-on.php
- Go to WordPress > Admin > PlugIns and activate the Extension
- Now, there is a new sort by: 'Name' visible
*/

namespace termCategoryPostsPro\CustomPlaceholderAddOn;

// Don't call the file directly
if ( !defined( 'ABSPATH' ) ) exit;

/**
 *  Applied to the list of sort orders some new ones.
 *  
 *  @return array of sort orders
 *  
 *  @since 1.1
 */
function custom_field ( $custom_field_names, $that, $instance ) { 
	global $post;

	/**
	 * Custom variables which can adapt for own purpose
	 */

	// Length in words
	$custom_excerpt_length = 20;

	// Custom text if not the normal excerpt should be shown
	$custom_excerpt = "About the permissions you can login to read the post text.";

	/**
	 * For debug purpose
	 */

	// uncomment for debug output to /wp-content/debug.log and set define( 'WP_DEBUG, true' ) in your wp-config.php
	// error_log("Filter debug cpwp_custom_placeholder: " . var_dump( $custom_field_names ));

	// Get user roles which intersect Members roles
	$user = get_userdata( get_current_user_id() );
	$user_roles = empty( $user ) ? array() : $user->roles; // WordPress user roles
	$post_access_roles = get_post_meta( get_the_ID(), '_members_access_role', false ); // Members roles (https://de.wordpress.org/plugins/members/)
	$intersect = array_intersect( $user_roles, $post_access_roles );

	$excerpt = "";
	if ( $custom_field_names === 'custom_excerpt' ) {
		if ( ( get_post_status ( get_the_ID() ) === 'publish' ) || ( is_user_logged_in() && ! empty( $intersect ) ) ) {	
			$excerpt = strip_tags( $that->itemExcerpt( $instance, false ) );
		} else {
			$excerpt = $custom_excerpt;
		}
		$a_excerpt = explode( ' ', $excerpt, $custom_excerpt_length );
		array_pop($a_excerpt);
		$excerpt = implode( $a_excerpt, ' ' );

	} else if ( $custom_field_names === 'custom_author' ) {

		return strip_tags( $that->itemAuthor( $instance, true ) );

	} else if ( $custom_field_names === 'custom_category' ) {

		return strip_tags( $that->itemTerms( $instance, 'category', true ) );

	} else if ( $custom_field_names === 'custom_commentnum' ) {

		return strip_tags( $that->itemCommentNum( $instance, true ) );

	} else if ( $custom_field_names === 'custom_date' ) {

		return strip_tags( $that->itemDate( $instance, true) );

	}

	return $excerpt;

}
add_filter( 'cpwp_custom_placeholder', __NAMESPACE__.'\custom_field', 10, 3 );