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Edit File: Translate.php

<?php
/**
 * Obtains translation data from objects.
 *
 * @link       http://cabrerahector.com
 * @since      4.0.0
 *
 * @package    WordPressPopularPosts
 */

namespace WordPressPopularPosts;

class Translate {
    /**
     * Default language code.
     *
     * @since    4.0.0
     * @access   private
     * @var      string
     */
    private $default_language;

/**
     * Current language code.
     *
     * @since    4.0.0
     * @access   private
     * @var      string
     */
    private $current_language;

/**
     * Initialize the collections used to maintain the actions and filters.
     *
     * @since    4.0.0
     */
    public function __construct()
    {
        //
    }

/**
     * Retrieves the code of the default language.
     *
     * @since    4.0.0
     * @return   string|null
     */
    public function get_default_language()
    {
        if ( ! $this->default_language ) {
            $this->default_language = ( function_exists('pll_default_language') ) ? pll_default_language() : apply_filters('wpml_default_language', null);
        }
        return $this->default_language;
    }

/**
     * Retrieves the code of the currently active language.
     *
     * @since    4.0.0
     * @return   string|null
     */
    public function get_current_language()
    {
        if ( ! $this->current_language ) {
            $this->current_language = ( function_exists('pll_current_language') ) ? pll_current_language() : apply_filters('wpml_current_language', null);
        }
        return $this->current_language;
    }

/**
     * Sets the code of the currently active language.
     *
     * @since    4.0.0
     * @return   string
     */
    public function set_current_language(string $code)
    {
        $this->current_language = $code;
    }

/**
     * Gets language locale.
     *
     * @since   5.0.0
     * @param   string      $lang   Language code (eg. 'es')
     * @return  string|bool
     */
    public function get_locale(string $lang)
    {
        // Polylang support
        if ( function_exists('PLL') ) {
            $lang_object = PLL()->model->get_language($lang);
            if ( $lang_object && isset($lang_object->locale) ) {
                return $lang_object->locale;
            }
        } else {
            // WPML support
            global $sitepress;
            if ( is_object($sitepress) && method_exists($sitepress, 'get_locale_from_language_code') ) {
                return $sitepress->get_locale_from_language_code($lang);
            }
        }

return false;
    }

/**
     * Retrieves the ID of an object.
     *
     * @since    4.0.0
     * @param    integer    $object_id
     * @param    string     $object_type
     * @param    boolean    $return_original_if_missing
     * @param    string     $lang_code
     * @return   integer
     */
    public function get_object_id(int $object_id, string $object_type = 'post', bool $return_original_if_missing = true, ?string $lang_code = '')
    {
        return apply_filters(
            'wpml_object_id',
            $object_id,
            $object_type,
            $return_original_if_missing,
            null == $lang_code ? $this->get_current_language() : $lang_code
        );
    }

/**
     * Translates URL.
     *
     * @since   5.0.0
     * @param   string      $original_permalink
     * @param   string      $lang
     * @return  string
     */
    public function url(string $original_permalink, ?string $lang)
    {
        return apply_filters('wpml_permalink', $original_permalink, $lang);
    }

/*
     * Retrieves the language code of an object.
     *
     * @since    4.0.0
     * @param    integer    $object_id
     * @param    string     $object_type
     * @return   string|null
     */
    public function get_object_lang_code(int $object_id, string $object_type = 'post')
    {
        return apply_filters(
            'wpml_element_language_code',
            null,
            [
                'element_id' => $object_id,
                'element_type' => $object_type
            ]
        );
    }
}