Tuts+ Create a Simple CRM in WordPress: Part 2

tuts-crm.php

<?php
/**
* Plugin Name: Tuts+ CRM
* Plugin URI: #
* Version: 1.0
* Author: Tuts+
* Author URI: http://code.tutsplus.com
* Description: A simple CRM system for WordPress
* License: GPL2
*/

class WPTutsCRM {
	/**
	* Constructor. Called when plugin is initialised
	*/
	function __construct() {
		add_action( 'init', array( &$this, 'register_custom_post_type' ) );
		add_action( 'add_meta_boxes', array( &$this, 'register_meta_boxes' ) );
		add_action( 'save_post', array( &$this, 'save_meta_boxes' ) );
	}
	
	/**
	* Registers a Custom Post Type called contact
	*/
	function register_custom_post_type() {
		register_post_type( 'contact', array(
            'labels' => array(
				'name'               => _x( 'Contacts', 'post type general name', 'tuts-crm' ),
				'singular_name'      => _x( 'Contact', 'post type singular name', 'tuts-crm' ),
				'menu_name'          => _x( 'Contacts', 'admin menu', 'tuts-crm' ),
				'name_admin_bar'     => _x( 'Contact', 'add new on admin bar', 'tuts-crm' ),
				'add_new'            => _x( 'Add New', 'contact', 'tuts-crm' ),
				'add_new_item'       => __( 'Add New Contact', 'tuts-crm' ),
				'new_item'           => __( 'New Contact', 'tuts-crm' ),
				'edit_item'          => __( 'Edit Contact', 'tuts-crm' ),
				'view_item'          => __( 'View Contact', 'tuts-crm' ),
				'all_items'          => __( 'All Contacts', 'tuts-crm' ),
				'search_items'       => __( 'Search Contacts', 'tuts-crm' ),
				'parent_item_colon'  => __( 'Parent Contacts:', 'tuts-crm' ),
				'not_found'          => __( 'No contacts found.', 'tuts-crm' ),
				'not_found_in_trash' => __( 'No contacts found in Trash.', 'tuts-crm' ),
			),
            
            // Frontend
            'has_archive' => false,
            'public' => false,
            'publicly_queryable' => false,
            
            // Admin
            'capability_type' => 'post',
            'menu_icon' => 'dashicons-businessman',
            'menu_position' => 10,
            'query_var' => true,
            'show_in_menu' => true,
            'show_ui' => true,
            'supports' => array(
            	'title',
            	'author',
            	'comments',
            ),
        ) );	
	}
	
	/**
	* Registers a Meta Box on our Contact Custom Post Type, called 'Contact Details'
	*/
	function register_meta_boxes() {
		add_meta_box( 'contact-details', __( 'Contact Details', 'tuts-crm' ), array( &$this, 'output_meta_box' ), 'contact', 'normal', 'high' );	
	}
	
	/**
	* Output a Contact Details meta box
	*
	* @param WP_Post $post WordPress Post object
	*/
	function output_meta_box($post) {
		// Get email address
		$email = get_post_meta( $post->ID, '_contact_email', true );
	
		// Add a nonce field so we can check for it later.
		wp_nonce_field( 'save_contact', 'contacts_nonce' );
		
		// Output label and field
		echo ( '<label for="contact_email">' . __('Email Address', 'tuts-crm') . '</label>' );
		echo ( '<input type="text" name="contact_email" id="contact_email" value="' . esc_attr($email) . '" />' );
	}
	
	/**
	* Saves the meta box field data
	*
	* @param int $post_id Post ID
	*/
	function save_meta_boxes($post_id) {
		// Check if our nonce is set.
		if ( !isset( $_POST['contacts_nonce'] ) ) {
			return $post_id;	
		}
	
		// Verify that the nonce is valid.
		if ( !wp_verify_nonce( $_POST['contacts_nonce'], 'save_contact' ) ) {
			return $post_id;
		}
	
		// Check this is the Contact Custom Post Type
		if ( 'contact' != $_POST['post_type'] ) {
			return $post_id;
		}
	
		// Check the logged in user has permission to edit this post
		if ( !current_user_can( 'edit_post', $post_id ) ) {
			return $post_id;
		}
	
		// OK to save meta data
		$email = sanitize_text_field( $_POST['contact_email'] );
		update_post_meta( $post_id, '_contact_email', $email );
	}
}

$wpTutsCRM = new WPTutsCRM;