return translations object from PhpCode::fromString #87
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Use case:
//Scan the php code from a string to find the latest gettext translations
$translations = Translations::fromPhpCodeString($string2translate);
//Get the translations of the code that are stored in a po file
$poTranslations = Translations::fromPoFile('en.po');
//Apply the translations from the po file to the translations, and merges header and comments but not references and without add or remove translations:
$translations->mergeWith($poTranslations, Translations::MERGE_HEADERS | Translations::MERGE_COMMENTS);
//Now save a po file with the result
$translations->toPoFile('en_new.po');