[WordPress] A Simple Guide for Organizing WordPress-centric Classes

00-abstract-metabox.php

<?php

namespace Acme\WordPress\Admin\MetaBox;

abstract class AbstractMetaBox
{
    protected $postType;
  
    public function __construct()
    {
        $this->postType = 'acme_post_type';
    }

    abstract public function render();
    abstract public function display();
}

01-acme-meta-box.php

<?php

namespace Acme\WordPress\Admin\MetaBox;

class AcmeMetaBox extends AbstractMetaBox
{
    /**
     * {@inheritdoc}
     */
    public function render()
    {
        add_meta_box(
            'acme-product-image',
            'Product Image',
            [$this, 'display'],
            $this->postType,
            'side',
            'default'
        );
    }

    /**
     * {@inheritdoc}
     */
    public function display()
    {
        include_once plugin_dir_path(__FILE__).'Views/acme-product-image.php';
    }
}

02-acme-product-image.php

<div class="product-image-metabox">
    <p>
        <img src="<?= esc_html(get_post_meta(get_the_ID(), 'product_image', true)); ?>" alt="<?= esc_attr(get_the_title()); ?>" />
        <input type="text" value="<?= esc_html(get_post_meta(get_the_ID(), 'product_image', true)); ?>" />
    </p>
</div>

03-phpunit.xml

<testsuites>
  <testsuite name="Plugin">
    <directory>./tests</directory>
    <exclude>./tests/phpunit</exclude>
    <exclude>./src/WordPress</exclude>
  </testsuite>
</testsuites>