PMG Core

PMG Core is a collection of utilities that PMG uses on its own and its clients sites. It's a library, with a tiny bit of functionality baked in.

Note: this plugin requires PHP 5.3+

Some things it does:

• Seeks to automate the creation of admin area fields.
• Makes adding meta boxes, user profile fields, and term fields really easy
• Automates the creation of post types and taxonomies.

Whirlwind Tour

The central entry point is the pmgcore function. You use this to create your own "projects".

<?php
$p = pmgcore('my_project');

You can call pmgcore anytime after plugins_loaded fires. Calling it multiple times with the same $key will not create new projects or overwrite a project that was already created.

Adding Types

<?php
pmgcore('my_project')->create_type(
    'the_post_type',
    __('Singular Name', 'your-textdomain'),
    __('Plural Names', 'your-textdomain'),
    array(
        'public'             => true,
        'show_in_nav_menues' => false,
    )
);

Adding Taxonomies

<?php
pmgcore('my_project')->create_taxonomy(
    'the_taxonomy',
    __('Singular Name', 'your-textdomain'),
    __('Plural Names', 'your-textdomain'),
    array(
        'show_ui'   => true,
    ),
    array('page') // post type you want (optional, defaults to post)
);

Adding Settings (and Other) Fields

Adding settings fields/sections to already existing pages (General Options here).

<?php
$f = pmgcore('my_project')->setting('my_setting', 'general');

$f->add_field('field_key, array(
    'label'     => __('Some Label', 'your-textdomain'),
    'type'      => 'text_input', // this is the default
    'cleaners'  => array('esc_url_raw'), // array of callable to run the field through on validation
    'section'   => 'default', // what section this belongs in (optional)
));

// add a new section
$f->add_section('section_key', array(
    'title'     => __('Section Title', 'your-textdomain'),
    'help'      => __('Section help text', 'your-textdomain'),
));

// put fields in the new section
$f->add_field('another_field_key', array(
    'label'     => __('Another Field', 'your-textdomain'),
    'type'      => 'textarea',
));

You can also add fields to a custom page by calling pmgcore()->setting without the second argument.

All field creation has the same API: add_section and add_field. As you want to create fields for a meta box:

<?php
$f = pmgcore('my_project')->box_fields('my_metabox');

// use $f as above

Or to create fields that use any of WordPress' various meta tables.

<?php
$f = pmgcore('my_project')->meta_fields('my_metafields');

// use $f as above

Additionally all fields have a render method which spits out the fields themselves. This behaves differently depending the type of fields created. See PMG\Core\Fields for more information.

Creating Admin Pages.

First step: create fields like above.

<?php
$f = pmgcore('my_project')->settings('my_setting');

// do stuff with $f

Then you can use the admin_page method.

<?php
pmgcore('my_project')->admin_page('page_key', $f, array(
    'title'     => __('Page Title', 'your-textdomain'),
    'menu_name' => __('Menu Name', 'your-textdomain'),
    'parent'    => 'options-general.php', // optional -- default is none, a top level menu page
    'slug'      => 'your-page-slug',
));

Adding Meta Boxes

Create a MetaBoxFields object like above.

<?php
$f = pmgcore('my_project')->box_fields('my_metabox');

// do stuff with $f

The use the meta_box method.

<?php
pmgcore('my_project')->meta_box('box_key', $f, array(
    'title'     => __('Box Title', 'your-textdomain'),
    'priority'  => 'high', // optional, default is 'high'
    'context'   => 'normal', // optional, default is 'normal'
));

The above will add a meta box to all public post types. You can specify post types with an optional last argument:

<?php
// put the box on pages.
pmgcore('my_project')->meta_box('box_key', $f, array(
    'title'     => __('Box Title', 'your-textdomain'),
    'priority'  => 'high', // optional, default is 'high'
    'context'   => 'normal', // optional, default is 'normal'
), array('page'));

Adding User & Term Fields

Like pretty much everything else: create a fields object (using meta_fields).

<?php
$f = pmgcore('my_project')->meta_fields('myterm_fields');

// do stuff with $f

To add user fields use the user_box method.

<?php
pmgcore('my_project')->user_box('box_key', $f);

Or to put fields on user pages, use the term_box method.

<?php
pmgcore('my_project')->term_box('box_key', $f);

The above will put fields on all taxonomies with show_ui set to true. To specify taxonomies, use the optional last argument.

<?php
pmgcore('my_project')->term_box('box_key', $f, array('category'));

Meta Objects

PMG Core contains some wrappers of the WordPress metadata API to make things easier to fetch and save. Namely, the library will prefix things for you so you don't have to worry about naming collisions.

There are four properties that contain these wrappers: postmeta, usermeta, commentmeta, termmeta.

They all have the same API:

<?php
$m = pmgcore('my_project')->postmeta;

// put 'a value' in with the key '_my_project_some_key'
$m->save($some_post_id, 'some_key', 'a value');

// fetch the value in 'some_key'
$m->get($some_post_id, 'some_key', 'default value');

// delete a key
$m->delete($some_post_id, 'some_key');

// delete all values with the key 'some_key'
$m->delete_all($some_post_id, 'some_key');

termmeta is not really termmeta. It fakes term meta using the options table. However, if $wpdb->termmeta is set (eg. someone has added a termmeta table) it will use that.

The limitation here is that the library deals with only single meta items. This may change in the future.

Adding Rewrites

Use the PMG\Core\Project::$router property.

Adding a rewrite rule

<?php
pmgcore('my_project')->router->add_rule(
    '^some-route/(\d+)/?$', // just regex
    'index.php?some_var=$matches[1]',
    'top' // this is option, defaults to top
);

Adding Rewrite Endpoints

<?php
pmgcore('my_project')->router->add_endpoint('ep', EP_ALL);

The second argument is option, defaults to EP_ALL. Learn more about endpoints here.

Adding Query Vars

<?php
pmgcore('my_project')->router->add_var('some_var');

// add more than one
pmgcore('your_project')->router->add_var(array('some_var', 'some_other_var'));

Using the Router

The above doesn't gain you much more than a bit of convenience. Use the add_route property to take some shortcuts.

add_route only takes one argument: a route. The route is just a string with several variables built in. The variables, in this case, take the form of <(int|str):some_key>. add_route will translate those into a rewrite.

So this:

<?php
pmcore('my_project')->router->add_route('route/<int:some_var>/<str:other_var>');

Is a shortcut for this:

<?php
$r = pmgcore('my_project')->router;

// add a rule
$r->add_rule(
    '^route/(\d+)/([^/]+)/?$',
    'index.php?some_var=$matches[1]&other_var=$matches[2]'
);

// add the query vars
$r->add_var(array('some_var', 'other_var'));

The downside, of course, is less fined grained control. If you need any sort of complex regex for your rewrite rules, it's better to just use strait regex and add_rule.

"Catching" Query Variables.

Sometimes you want to "catch" query variables on the front end and do certain things if they hapen to be set. PMG\Core\Router::catch_var let's you do that.

It takes two arguments: a query var to search and the callable to call when it's found. There's an optional third argument, $exit, which, if true, will cause the execution to stop after the callable has been called. $exit defaults to true.

<?php
pmgcore('my_project')->router->catch_var('some_var', function($v) {
    echo $v; // $v is the query var that was caught
});

Pluggable

PMG Core uses dependency injection to prevent loading a bunch of crap you don't need. In short, you can use the pmgcore entry point and only objects that you use explicitely will be created.

To give an example, the first time you use the postmeta property, the object that wraps the metadata API for post meta is created.

You can also mix and match classes as you see fit. I tried to keep everything loosely coupled.

Functionality

There is a little bit of functionality baked into this plugin.

Cleanup

• Remove the meta generator tag from the <head> section
• Allow users how can post unfiltered_html to put whatever they like in term descriptions
• Set the default pingback flag to off
• Set the default ping status to off
• Set the default comment status to off
• Enable comment moderation
• Disable XML RPC
• Disabled WP-App (for WordPress 3.4 and lower)
• Remove all but the "Right Now" dashboard meta boxes

Uploads

• Set the upload path to {$_SERVER['DOCUMENT_ROOT']}/uploads
• Set the upload url to //{WP_HOME}/uploads

Headers

• Remove the shortlink header
• Add X-Frame-Options: SAMEORIGIN as a header on all WP rendered pages.
• Add X-UA-Compatible: IE=edge,chrome=1 as a header on all WP rendered pages.
• Remove the X-Pingback header.
• Set an X-Powered-By header

Enqueues

A single CSS and JS enqueue for the admin area -- this to make some pretty tabs on metaboxes with multiple field sections.