00-Plugin Internationalization.md

Examples of good and bad practices in WordPress plugin i18n.

01-catalan-code.php

<?php

/**
 * Aquesta funció retorna el usuaris que...
 */
function nelio_cerca_usuaris() {
  // Inicialitzem la llista d'usuaris.
  $usuaris = array();
  // Executem la cerca i afegim els resultats a la llista.
  // ...
  wp_send_json( $usuaris );
}//end nelio_cerca_usuaris()

02-english-code.php

<?php

/**
 * This function returns the list of users that...
 */
function nelio_search_users() {
  // Initializing user list.
  $users = array();
  // Search users and populate $user list.
  // ...
  wp_send_json( $users );
}//end nelio_search_users()

03-echo-string.php

<?php
echo esc_html( 'This is a non-translatable message.' );

04-echo-i18n-string.php

<?php
echo esc_html( __( 'This string can be translated.', 'plugin-name' ) );

05-makepot-en.sh

# Plugins:
php /path/to/makepot.php wp-plugin . languages/plugin-name.pot

# Themes:
php /path/to/makepot.php wp-theme . languages/plugin-name.pot

05-makepot-es.sh

# Plugins:
php /ruta/al/fichero/makepot.php wp-plugin . languages/plugin-name.pot

# Themes:
php /ruta/al/fichero/makepot.php wp-theme . languages/plugin-name.pot

06-plugin-header.php

<?php
/**
 * The plugin bootstrap file.
 *
 * Plugin Name: Example
 * Plugin URI:  https://example.com
 * Description: Describe your plugin here.
 * Version:     1.0.0
 *
 * Author:      Nelio Software
 * Author URI:  https://neliosoftware.com
 * License:     GPL-2.0+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 *
 * Text Domain: plugin-name
 * Domain Path: /languages
 *
 * @author     David Aguilera <david.aguilera@neliosoftware.com>
 * @since      1.0.0
 */

/**
 * Load i18n strings.
 *
 * @since      1.0.0
 */
function plugin_name_i18n() {
	load_plugin_textdomain( 'plugin-name', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
}//end plugin_name_i18n()
add_action( 'plugins_loaded', 'plugin_name_i18n' );

07-concat.php

<?php
if ( $something ) {
  $elem = __( 'user', 'plugin-name' );
} else {
  $elem = __( 'post', 'plugin-name' );
}//end if

echo esc_html( __( 'The ', 'plugin-name' ) . $elem . __( ' has been deleted.', 'plugin-name' ) );

08-bad-plurals-01.php

<?php
if ( 1 === $count ) {
  echo esc_html( __( '1 result', 'plugin-name' ) );
} else {
  echo esc_html( $count . __( ' results', 'plugin-name' ) );
}//end if

09-bad-plurals-02.php

<?php
echo esc_html( $count . __( ' result', 'plugin-name' ) . ( 1 !== $count ) ? 's' : '' );

10-full-sentences.php

<?php
if ( $something ) {
  echo esc_html( __( 'The user has been deleted.', 'plugin-name' ) );
} else {
  echo esc_html( __( 'The post has been deleted.', 'plugin-name' ) );
}//end if

11-without-placeholders.php

<?php
echo esc_html( __( 'Hello, ', 'plugin-name' ) . $name );

12-placeholders.php

<?php
printf(
  esc_html( __( 'Hello, %s', 'plugin-name' ) ),
  $name
);

13-better-plurals-still-wrong.php

<?php
if ( 1 === $count ) {
  echo esc_html( __( '1 result', 'plugin-name' ) );
} else {
  printf(
    esc_html( __( '%d results', 'plugin-name' ) ),
    $count
  );
}//end if

13-plurals-ok.php

<?php
printf(
  esc_html( _n( '%d result', '%d results', $count, 'plugin-name' ) ),
  $count
);

14-context.php

<h1><?php echo esc_html( _x( 'Comment', 'text', 'plugin-name' ) ); ?></h1>
<form ...>
  ...
  <input type="submit" value="<?php echo esc_attr( _x( 'Comment', 'command', 'plugin-name' ) ); ?>" />
</form>

15-wtf.php

<?php
echo esc_html( __( 'g:i:s a', 'my-text-domain' ) );

16-descriptions.php

<?php
/* translators: draft saved date format, see http://php.net/date */
echo esc_html( __( 'g:i:s a', 'my-text-domain' ) );