Contribution to i18next project to auto-translate missing entries

index.php

<?php

    #
    # i18next
    #
    # This script can be used to auto-translate missing keys when using
    # "sendMissing: true" option in i18next.
    # It should be placed - renamed as "index.php" - inside each of locales
    # subdirs (say: 'locales/it/index.php', 'locales/es/index.php', ...).
    # A sample of i18n config options could be:
    #     i18n.init({
    #         sendMissing: true, // set this to false in production
    #            resPostPath: 'locales/__lng__/',
    #         sendMissingTo: 'current',
    #         postAsync: true,
    #    }, function() {
    #        $("body").i18n();
    #    });
    #
    # Notes:
    #     JSON translations files shoul be writable by web server user
    #      (example: "chown www-data locales/*/translation.json")
    #
    #     Of course automatic translations MUST be revised by a human...
    #

    $from = 'en'; // source language is always English, by definition
    $to = basename(dirname(__FILE__)); // destination language is the name of parent directory where this script resides

    $jsonTranslationsFile = "./translation.json"; // JSON translation file

    // open the the JSON translations file
    if (($handle = fopen($jsonTranslationsFile, "c+")) === FALSE) {
        $e = error_get_last();
        error("can't open [$to] translations file!" . " " . $e["message"]);
    }

    if (flock($handle, LOCK_EX)) { // lock file and return with error if unable to lock
        $size = filesize($jsonTranslationsFile);
        if ($size > 0) { // some translation already exists
            $jsonTranslations = fread($handle, filesize($jsonTranslationsFile)); # translations JSON
            $translations = json_decode($jsonTranslations, true); # array from translations
        } else {
            $translations = array(); // empty array
        }

        // usually we have only one key in the request, but loop on all parameters to be on the safe side...
        foreach ($_REQUEST as $key) {
            $key = urldecode($key);
            if (!array_key_exists($key, $translations)) { // check key isn't present, yet (it shouldn't be...)
                $value = translate($key, $from, $to); // translate key
                $translations[$key] = $value; // add translated key to translations
            }
        }
        ksort($translations, SORT_STRING | SORT_FLAG_CASE); // sort translations keys to produce a sorted file...
        $jsonTranslations = json_encode($translations, JSON_PRETTY_PRINT);
        ftruncate($handle, 0); // truncate file
        rewind($handle); // rewind file handle
        if (fwrite($handle, $jsonTranslations) === FALSE) {
            error("can't write to [$to] translations file!");
        }
        flock($handle, LOCK_UN); // unlock file
    } else {
        error("can't lock to read [$to] translations file!");
    }

    // close file
    fclose($handle);

    terminate($translations);


    # translate a word with Google service
    function translate($word, $from, $to) {
        $word = urlencode($word);
        $url = "http://translate.google.com/translate_a/t?client=t&text=".$word."&hl=".$from."&sl=".$from."&tl=".$to."&ie=UTF-8&oe=UTF-8&multires=1&otf=1&ssel=3&tsel=3&sc=1";
        $result = curl($url);
        $result = explode('"', $result);
        $translation = $result[1];
        return $translation;
    }

    function curl($url, $params = array(), $isCookieSet = false) {
        if (!$isCookieSet) {
            // create a cookie file
            $curlCookieFile = tempnam("/tmp", "CURLCOOKIE");
     
            // visit the page to set the cookie properly
            $ch = curl_init($url);
            curl_setopt($ch, CURLOPT_COOKIEJAR, $curlCookieFile);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            $output = curl_exec($ch);
        }
     
        $str = ''; $str_arr= array();
        foreach ($params as $key => $value) {
            $str_arr[] = urlencode($key) . "=" . urlencode($value);
        }
        if (!empty($str_arr))
            $str = '?' . implode('&', $str_arr);
     
        // visit the cookie page
        $Url = $url . $str;
        $ch = curl_init($Url);
        curl_setopt($ch, CURLOPT_COOKIEFILE, $curlCookieFile);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
         $output = curl_exec($ch);
        return $output;
    }
     
    function terminate($data) {
        jsonOut($data);
        exit(0);
    }

    function error($msg) {
        $lastError = error_get_last();
        if ($lastError["message"]) {
            $msg .= " (" . $lastError["message"] . ")";
        }
        jsonOut(["error" => $msg]);
        exit(-1);
    }

    function jsonOut($msg) {
        header('Content-type: application/json');
        print json_encode($msg);
    }
?>