BenBen

My SEO Plugin

To create a custom SEO plugin without modifying the WordPress theme, it is ideal to use a plugin boilerplate – a basic structure that adheres to WordPress coding and documentation standards. For example, you can use the WordPress Plugin Boilerplate by Devin Vinson, which you can find at:

GITHUB.COM
https://github.com/DevinVinson/WordPress-Plugin-Boilerplate
Download:
https://github.com/DevinVinson/WordPress-Plugin-Boilerplate/archive/refs/heads/master.zip

This boilerplate allows you to quickly start developing your own plugin and you can easily add functions for managing meta tags (e.g., Open Graph for social networks) as well as for generating previews of individual posts and pages.

Step 1 – Downloading and Preparing the Boilerplate
Download the boilerplate:

1. Go to https://github.com/DevinVinson/WordPress-Plugin-Boilerplate and download the ZIP archive.
2. Unzip the archive and rename the resulting folder to the name of your plugin, for example, my-seo-plugin.

Below is the complete implementation of a basic SEO plugin that meets your requirements. This plugin uses its own boilerplate – with an administrative section for setting default values for meta tags (SEO title, meta description, and image URL) and automatic generation of meta tags on the frontend (Open Graph and Twitter Card). Follow the steps below and copy the provided files into your plugin directory (e.g., in the folder my-seo-plugin) with the following structure:

my-seo-plugin/
├── admin/
│ └── class-my-seo-plugin-admin.php
├── includes/
│ ├── class-my-seo-plugin.php
│ ├── class-my-seo-plugin-activator.php
│ └── class-my-seo-plugin-deactivator.php
├── public/
│ └── class-my-seo-plugin-public.php
└── my-seo-plugin.php

Main plugin file (my-seo-plugin.php):

<?php
/**
 * Plugin Name:       My SEO Plugin
 * Plugin URI:        https://benben.sk/my-seo-plugin
 * Description:       SEO plugin pre správne nastavenie meta tagov pre sociálne siete – Open Graph, Twitter Card a pod.
 * Version:           1.0.0
 * Author:            BenBen
 * Author URI:        https://benben.sk
 * License:           GPL-2.0+
 * Text Domain:       my-seo-plugin
 * Domain Path:       /languages
 */

// Ak je tento súbor volaný priamo, ukončíme vykonávanie.
if ( ! defined( 'WPINC' ) ) {
	die;
}

/**
 * Definícia verzie pluginu.
 */
define( 'MY_SEO_PLUGIN_VERSION', '1.0.0' );

/**
 * Funkcia, ktorá sa spustí pri aktivácii pluginu.
 */
function activate_my_seo_plugin() {
	require_once plugin_dir_path( __FILE__ ) . 'includes/class-my-seo-plugin-activator.php';
	My_SEO_Plugin_Activator::activate();
}

/**
 * Funkcia, ktorá sa spustí pri deaktivácii pluginu.
 */
function deactivate_my_seo_plugin() {
	require_once plugin_dir_path( __FILE__ ) . 'includes/class-my-seo-plugin-deactivator.php';
	My_SEO_Plugin_Deactivator::deactivate();
}

/**
 * Registrácia aktivačných a deaktivačných hookov.
 */
register_activation_hook( __FILE__, 'activate_my_seo_plugin' );
register_deactivation_hook( __FILE__, 'deactivate_my_seo_plugin' );

/**
 * Načítanie administratívnej časti pluginu, ak sme v admin prostredí.
 */
if ( is_admin() ) {
	require_once plugin_dir_path( __FILE__ ) . 'admin/class-my-seo-plugin-admin.php';
	$my_seo_admin = new My_SEO_Plugin_Admin();
	add_action( 'admin_menu', array( $my_seo_admin, 'add_plugin_page' ) );
	add_action( 'admin_init', array( $my_seo_admin, 'page_init' ) );
}

/**
 * Načítanie front-end časti pluginu, ak nie sme v administrácii.
 */
if ( ! is_admin() ) {
	require_once plugin_dir_path( __FILE__ ) . 'public/class-my-seo-plugin-public.php';
	$my_seo_public = new My_SEO_Plugin_Public();
	add_action( 'wp_head', array( $my_seo_public, 'add_meta_tags' ) );
}

/**
 * Načítanie hlavnej triedy pluginu.
 */
require plugin_dir_path( __FILE__ ) . 'includes/class-my-seo-plugin.php';

/**
 * Spustenie pluginu.
 */
function run_my_seo_plugin() {
	$plugin = new My_SEO_Plugin();
	$plugin->run();
}
run_my_seo_plugin();

Class for plugin activation (includes/class-my-seo-plugin-activator.php):

<?php
// File: includes/class-my-seo-plugin-activator.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Activator {
	public static function activate() {
		// Tu môžeš inicializovať predvolené nastavenia, ak je potrebné.
		if ( false === get_option( 'my_seo_plugin_options' ) ) {
			$default_options = array(
				'default_title'       => '',
				'default_description' => '',
				'default_image'       => ''
			);
			add_option( 'my_seo_plugin_options', $default_options );
		}
	}
}

Class for plugin deactivation (includes/class-my-seo-plugin-deactivator.php):

<?php
// File: includes/class-my-seo-plugin-deactivator.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Deactivator {
	public static function deactivate() {
		// Ak chceš, môžeš odstrániť nastavenia pri deaktivácii:
		// delete_option( 'my_seo_plugin_options' );
	}
}

Main plugin class (includes/class-my-seo-plugin.php):

<?php
// File: includes/class-my-seo-plugin.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin {
	public function run() {
		// Ak potrebujeme, môžeme tu definovať ďalšie funkcie alebo hooky.
		// Pre tento základný plugin nemusíme pridávať ďalší kód.
	}
}

Administrative class (admin/class-my-seo-plugin-admin.php):

<?php
// File: admin/class-my-seo-plugin-admin.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Admin {
	private $options;

	public function __construct() {
		// Načítanie uložených nastavení
		$this->options = get_option( 'my_seo_plugin_options' );
	}

	public function add_plugin_page() {
		// Pridanie podmenu pod Nastavenia
		add_options_page(
			'My SEO Plugin Settings',
			'My SEO Plugin',
			'manage_options',
			'my-seo-plugin',
			array( $this, 'create_admin_page' )
		);
	}

	public function create_admin_page() {
		?>
		<div class="wrap">
			<h1>My SEO Plugin Nastavenia</h1>
			<form method="post" action="options.php">
				<?php
					settings_fields( 'my_seo_plugin_option_group' );
					do_settings_sections( 'my-seo-plugin-admin' );
					submit_button();
				?>
			</form>
		</div>
		<?php
	}

	public function page_init() {
		register_setting(
			'my_seo_plugin_option_group', // Option group
			'my_seo_plugin_options',      // Option name
			array( $this, 'sanitize' )    // Sanitize callback
		);

		add_settings_section(
			'setting_section_id',
			'SEO Meta Nastavenia',
			array( $this, 'print_section_info' ),
			'my-seo-plugin-admin'
		);

		add_settings_field(
			'default_title',
			'Predvolený SEO Title',
			array( $this, 'default_title_callback' ),
			'my-seo-plugin-admin',
			'setting_section_id'
		);

		add_settings_field(
			'default_description',
			'Predvolený Meta Description',
			array( $this, 'default_description_callback' ),
			'my-seo-plugin-admin',
			'setting_section_id'
		);

		add_settings_field(
			'default_image',
			'Predvolený URL obrázku (pre OG/Twitter)',
			array( $this, 'default_image_callback' ),
			'my-seo-plugin-admin',
			'setting_section_id'
		);
	}

	public function sanitize( $input ) {
		$new_input = array();
		if ( isset( $input['default_title'] ) )
			$new_input['default_title'] = sanitize_text_field( $input['default_title'] );

		if ( isset( $input['default_description'] ) )
			$new_input['default_description'] = sanitize_text_field( $input['default_description'] );

		if ( isset( $input['default_image'] ) )
			$new_input['default_image'] = esc_url_raw( $input['default_image'] );

		return $new_input;
	}

	public function print_section_info() {
		print 'Zadajte predvolené hodnoty, ktoré sa budú používať, ak nie sú špecifikované pre konkrétnu stránku:';
	}

	public function default_title_callback() {
		printf(
			'<input type="text" id="default_title" name="my_seo_plugin_options[default_title]" value="%s" size="50" />',
			isset( $this->options['default_title'] ) ? esc_attr( $this->options['default_title'] ) : ''
		);
	}

	public function default_description_callback() {
		printf(
			'<textarea id="default_description" name="my_seo_plugin_options[default_description]" rows="5" cols="50">%s</textarea>',
			isset( $this->options['default_description'] ) ? esc_textarea( $this->options['default_description'] ) : ''
		);
	}

	public function default_image_callback() {
		printf(
			'<input type="text" id="default_image" name="my_seo_plugin_options[default_image]" value="%s" size="50" />',
			isset( $this->options['default_image'] ) ? esc_url( $this->options['default_image'] ) : ''
		);
	}
}

Front-end class (public/class-my-seo-plugin-public.php):

<?php
// File: public/class-my-seo-plugin-public.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Public {
	private $options;

	public function __construct() {
		// Načítanie nastavení z admin sekcie
		$this->options = get_option( 'my_seo_plugin_options' );
	}

	// Funkcia, ktorá pridá meta tagy do hlavičky stránky
	public function add_meta_tags() {
		// Ak sme na singular stránke (príspevok alebo stránka)
		if ( is_singular() ) {
			global $post;
			setup_postdata( $post );
			$seo_title = get_the_title();
			$seo_description = has_excerpt() ? get_the_excerpt() : wp_trim_words( strip_tags( $post->post_content ), 55 );
			$seo_image = ''; // Sem môžeš pridať logiku na získanie vybraného obrázku, ak je definovaný (napr. pomocou get_post_meta)
			wp_reset_postdata();
		} else {
			// Pre homepage alebo archívy použijeme predvolené hodnoty z nastavení
			$seo_title = isset( $this->options['default_title'] ) && ! empty( $this->options['default_title'] ) ? $this->options['default_title'] : get_bloginfo( 'name' );
			$seo_description = isset( $this->options['default_description'] ) && ! empty( $this->options['default_description'] ) ? $this->options['default_description'] : get_bloginfo( 'description' );
			$seo_image = isset( $this->options['default_image'] ) ? $this->options['default_image'] : '';
		}

		// Možnosť prepísať hodnoty cez filter
		$seo_title = apply_filters( 'my_seo_plugin_title', $seo_title );
		$seo_description = apply_filters( 'my_seo_plugin_description', $seo_description );
		$seo_image = apply_filters( 'my_seo_plugin_image', $seo_image );

		// Vypísanie meta tagov
		echo "\n<!-- My SEO Plugin Meta Tags -->\n";
		echo '<meta property="og:title" content="' . esc_attr( $seo_title ) . '">' . "\n";
		echo '<meta property="og:description" content="' . esc_attr( $seo_description ) . '">' . "\n";
		if ( ! empty( $seo_image ) ) {
			echo '<meta property="og:image" content="' . esc_url( $seo_image ) . '">' . "\n";
		}
		echo '<meta property="og:url" content="' . esc_url( get_permalink() ) . '">' . "\n";
		echo '<meta property="og:type" content="website">' . "\n";

		// Twitter Card meta tagy
		echo '<meta name="twitter:card" content="summary_large_image">' . "\n";
		echo '<meta name="twitter:title" content="' . esc_attr( $seo_title ) . '">' . "\n";
		echo '<meta name="twitter:description" content="' . esc_attr( $seo_description ) . '">' . "\n";
		if ( ! empty( $seo_image ) ) {
			echo '<meta name="twitter:image" content="' . esc_url( $seo_image ) . '">' . "\n";
		}
	}
}

Installation and Testing

Save all these files into their respective directories according to the structure mentioned above.

Zip the entire folder my-seo-plugin into a ZIP archive.

Log in to your WordPress admin area, navigate to Plugins → Add New, and upload the ZIP file.

Activate the plugin.

In the admin panel, you will find a new option under Settings → My SEO Plugin, where you can enter the default values.

Open a page or post on the front end and inspect the source code (Ctrl+U) to verify that the header correctly includes the meta tag code.

My SEO plugin

Na vytvorenie vlastného SEO pluginu bez zásahu do šablóny WordPress je ideálne využiť pluginový boilerplate – základnú štruktúru, ktorá dodržiava WordPress coding a dokumentačné štandardy. Napríklad môžete použiť WordPress Plugin Boilerplate od Devin Vinsona, ktorý nájdete na:

​
GITHUB.COM
https://github.com/DevinVinson/WordPress-Plugin-Boilerplate
Download:
https://github.com/DevinVinson/WordPress-Plugin-Boilerplate/archive/refs/heads/master.zip

Tento boilerplate vám umožní rýchlo začať s vývojom vlastného pluginu a môžete do neho jednoducho pridať funkcie pre správu meta tagov (napr. Open Graph pre sociálne siete) aj pre náhľady samostatných príspevkov a stránok.

Krok 1 – Stiahnutie a príprava boilerplate
Stiahnutie boilerplate:

Choď na https://github.com/DevinVinson/WordPress-Plugin-Boilerplate a stiahni ZIP archív.
Rozbal ZIP a premenuj výsledný priečinok na názov tvojho pluginu, napríklad my-seo-plugin.

Nižšie uvádzam kompletnú implementáciu základného SEO pluginu, ktorý spĺňa tvoje zadanie. Tento plugin používa vlastný boilerplate – s administratívnou sekciou na nastavenie predvolených hodnôt pre meta tagy (SEO title, meta description a URL obrázku) a automatickou generáciou meta tagov na frontende (Open Graph a Twitter Card). Postupuj podľa nasledujúcich krokov a skopíruj uvedené súbory do svojho adresára pluginu (napr. do priečinka my-seo-plugin) s nasledujúcou štruktúrou:

my-seo-plugin/
├── admin/
│ └── class-my-seo-plugin-admin.php
├── includes/
│ ├── class-my-seo-plugin.php
│ ├── class-my-seo-plugin-activator.php
│ └── class-my-seo-plugin-deactivator.php
├── public/
│ └── class-my-seo-plugin-public.php
└── my-seo-plugin.php

Hlavný súbor pluginu (my-seo-plugin.php):

<?php
/**
 * Plugin Name:       My SEO Plugin
 * Plugin URI:        https://benben.sk/my-seo-plugin
 * Description:       SEO plugin pre správne nastavenie meta tagov pre sociálne siete – Open Graph, Twitter Card a pod.
 * Version:           1.0.0
 * Author:            BenBen
 * Author URI:        https://benben.sk
 * License:           GPL-2.0+
 * Text Domain:       my-seo-plugin
 * Domain Path:       /languages
 */

// Ak je tento súbor volaný priamo, ukončíme vykonávanie.
if ( ! defined( 'WPINC' ) ) {
	die;
}

/**
 * Definícia verzie pluginu.
 */
define( 'MY_SEO_PLUGIN_VERSION', '1.0.0' );

/**
 * Funkcia, ktorá sa spustí pri aktivácii pluginu.
 */
function activate_my_seo_plugin() {
	require_once plugin_dir_path( __FILE__ ) . 'includes/class-my-seo-plugin-activator.php';
	My_SEO_Plugin_Activator::activate();
}

/**
 * Funkcia, ktorá sa spustí pri deaktivácii pluginu.
 */
function deactivate_my_seo_plugin() {
	require_once plugin_dir_path( __FILE__ ) . 'includes/class-my-seo-plugin-deactivator.php';
	My_SEO_Plugin_Deactivator::deactivate();
}

/**
 * Registrácia aktivačných a deaktivačných hookov.
 */
register_activation_hook( __FILE__, 'activate_my_seo_plugin' );
register_deactivation_hook( __FILE__, 'deactivate_my_seo_plugin' );

/**
 * Načítanie administratívnej časti pluginu, ak sme v admin prostredí.
 */
if ( is_admin() ) {
	require_once plugin_dir_path( __FILE__ ) . 'admin/class-my-seo-plugin-admin.php';
	$my_seo_admin = new My_SEO_Plugin_Admin();
	add_action( 'admin_menu', array( $my_seo_admin, 'add_plugin_page' ) );
	add_action( 'admin_init', array( $my_seo_admin, 'page_init' ) );
}

/**
 * Načítanie front-end časti pluginu, ak nie sme v administrácii.
 */
if ( ! is_admin() ) {
	require_once plugin_dir_path( __FILE__ ) . 'public/class-my-seo-plugin-public.php';
	$my_seo_public = new My_SEO_Plugin_Public();
	add_action( 'wp_head', array( $my_seo_public, 'add_meta_tags' ) );
}

/**
 * Načítanie hlavnej triedy pluginu.
 */
require plugin_dir_path( __FILE__ ) . 'includes/class-my-seo-plugin.php';

/**
 * Spustenie pluginu.
 */
function run_my_seo_plugin() {
	$plugin = new My_SEO_Plugin();
	$plugin->run();
}
run_my_seo_plugin();

Trieda pre aktiváciu pluginu (includes/class-my-seo-plugin-activator.php)

<?php
// File: includes/class-my-seo-plugin-activator.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Activator {
	public static function activate() {
		// Tu môžeš inicializovať predvolené nastavenia, ak je potrebné.
		if ( false === get_option( 'my_seo_plugin_options' ) ) {
			$default_options = array(
				'default_title'       => '',
				'default_description' => '',
				'default_image'       => ''
			);
			add_option( 'my_seo_plugin_options', $default_options );
		}
	}
}

Trieda pre deaktiváciu pluginu (includes/class-my-seo-plugin-deactivator.php)

<?php
// File: includes/class-my-seo-plugin-deactivator.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Deactivator {
	public static function deactivate() {
		// Ak chceš, môžeš odstrániť nastavenia pri deaktivácii:
		// delete_option( 'my_seo_plugin_options' );
	}
}

Hlavná trieda pluginu (includes/class-my-seo-plugin.php)

<?php
// File: includes/class-my-seo-plugin.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin {
	public function run() {
		// Ak potrebujeme, môžeme tu definovať ďalšie funkcie alebo hooky.
		// Pre tento základný plugin nemusíme pridávať ďalší kód.
	}
}

Administratívna trieda (admin/class-my-seo-plugin-admin.php)

<?php
// File: admin/class-my-seo-plugin-admin.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Admin {
	private $options;

	public function __construct() {
		// Načítanie uložených nastavení
		$this->options = get_option( 'my_seo_plugin_options' );
	}

	public function add_plugin_page() {
		// Pridanie podmenu pod Nastavenia
		add_options_page(
			'My SEO Plugin Settings',
			'My SEO Plugin',
			'manage_options',
			'my-seo-plugin',
			array( $this, 'create_admin_page' )
		);
	}

	public function create_admin_page() {
		?>
		<div class="wrap">
			<h1>My SEO Plugin Nastavenia</h1>
			<form method="post" action="options.php">
				<?php
					settings_fields( 'my_seo_plugin_option_group' );
					do_settings_sections( 'my-seo-plugin-admin' );
					submit_button();
				?>
			</form>
		</div>
		<?php
	}

	public function page_init() {
		register_setting(
			'my_seo_plugin_option_group', // Option group
			'my_seo_plugin_options',      // Option name
			array( $this, 'sanitize' )    // Sanitize callback
		);

		add_settings_section(
			'setting_section_id',
			'SEO Meta Nastavenia',
			array( $this, 'print_section_info' ),
			'my-seo-plugin-admin'
		);

		add_settings_field(
			'default_title',
			'Predvolený SEO Title',
			array( $this, 'default_title_callback' ),
			'my-seo-plugin-admin',
			'setting_section_id'
		);

		add_settings_field(
			'default_description',
			'Predvolený Meta Description',
			array( $this, 'default_description_callback' ),
			'my-seo-plugin-admin',
			'setting_section_id'
		);

		add_settings_field(
			'default_image',
			'Predvolený URL obrázku (pre OG/Twitter)',
			array( $this, 'default_image_callback' ),
			'my-seo-plugin-admin',
			'setting_section_id'
		);
	}

	public function sanitize( $input ) {
		$new_input = array();
		if ( isset( $input['default_title'] ) )
			$new_input['default_title'] = sanitize_text_field( $input['default_title'] );

		if ( isset( $input['default_description'] ) )
			$new_input['default_description'] = sanitize_text_field( $input['default_description'] );

		if ( isset( $input['default_image'] ) )
			$new_input['default_image'] = esc_url_raw( $input['default_image'] );

		return $new_input;
	}

	public function print_section_info() {
		print 'Zadajte predvolené hodnoty, ktoré sa budú používať, ak nie sú špecifikované pre konkrétnu stránku:';
	}

	public function default_title_callback() {
		printf(
			'<input type="text" id="default_title" name="my_seo_plugin_options[default_title]" value="%s" size="50" />',
			isset( $this->options['default_title'] ) ? esc_attr( $this->options['default_title'] ) : ''
		);
	}

	public function default_description_callback() {
		printf(
			'<textarea id="default_description" name="my_seo_plugin_options[default_description]" rows="5" cols="50">%s</textarea>',
			isset( $this->options['default_description'] ) ? esc_textarea( $this->options['default_description'] ) : ''
		);
	}

	public function default_image_callback() {
		printf(
			'<input type="text" id="default_image" name="my_seo_plugin_options[default_image]" value="%s" size="50" />',
			isset( $this->options['default_image'] ) ? esc_url( $this->options['default_image'] ) : ''
		);
	}
}

Front-end trieda (public/class-my-seo-plugin-public.php)

<?php
// File: public/class-my-seo-plugin-public.php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class My_SEO_Plugin_Public {
	private $options;

	public function __construct() {
		// Načítanie nastavení z admin sekcie
		$this->options = get_option( 'my_seo_plugin_options' );
	}

	// Funkcia, ktorá pridá meta tagy do hlavičky stránky
	public function add_meta_tags() {
		// Ak sme na singular stránke (príspevok alebo stránka)
		if ( is_singular() ) {
			global $post;
			setup_postdata( $post );
			$seo_title = get_the_title();
			$seo_description = has_excerpt() ? get_the_excerpt() : wp_trim_words( strip_tags( $post->post_content ), 55 );
			$seo_image = ''; // Sem môžeš pridať logiku na získanie vybraného obrázku, ak je definovaný (napr. pomocou get_post_meta)
			wp_reset_postdata();
		} else {
			// Pre homepage alebo archívy použijeme predvolené hodnoty z nastavení
			$seo_title = isset( $this->options['default_title'] ) && ! empty( $this->options['default_title'] ) ? $this->options['default_title'] : get_bloginfo( 'name' );
			$seo_description = isset( $this->options['default_description'] ) && ! empty( $this->options['default_description'] ) ? $this->options['default_description'] : get_bloginfo( 'description' );
			$seo_image = isset( $this->options['default_image'] ) ? $this->options['default_image'] : '';
		}

		// Možnosť prepísať hodnoty cez filter
		$seo_title = apply_filters( 'my_seo_plugin_title', $seo_title );
		$seo_description = apply_filters( 'my_seo_plugin_description', $seo_description );
		$seo_image = apply_filters( 'my_seo_plugin_image', $seo_image );

		// Vypísanie meta tagov
		echo "\n<!-- My SEO Plugin Meta Tags -->\n";
		echo '<meta property="og:title" content="' . esc_attr( $seo_title ) . '">' . "\n";
		echo '<meta property="og:description" content="' . esc_attr( $seo_description ) . '">' . "\n";
		if ( ! empty( $seo_image ) ) {
			echo '<meta property="og:image" content="' . esc_url( $seo_image ) . '">' . "\n";
		}
		echo '<meta property="og:url" content="' . esc_url( get_permalink() ) . '">' . "\n";
		echo '<meta property="og:type" content="website">' . "\n";

		// Twitter Card meta tagy
		echo '<meta name="twitter:card" content="summary_large_image">' . "\n";
		echo '<meta name="twitter:title" content="' . esc_attr( $seo_title ) . '">' . "\n";
		echo '<meta name="twitter:description" content="' . esc_attr( $seo_description ) . '">' . "\n";
		if ( ! empty( $seo_image ) ) {
			echo '<meta name="twitter:image" content="' . esc_url( $seo_image ) . '">' . "\n";
		}
	}
}

Inštalácia a testovanie

1. Ulož všetky tieto súbory do príslušných adresárov podľa štruktúry uvedenej hore.
2. Zbal celý priečinok my-seo-plugin do ZIP archívu.
3. Prihlás sa do administrácie WordPress, choď do Pluginy → Pridať nový a nahraj ZIP súbor.
4. Aktivuj plugin.
5. V administrácii nájdeš novú položku pod Nastavenia → My SEO Plugin, kde môžeš zadať predvolené hodnoty.
6. Otvor stránku alebo príspevok na frontende a skontroluj zdrojový kód (Ctrl+U), aby si overil, či sa do hlavičky správne vkladá kód s meta tagmi.