[wp-trac] [WordPress Trac] #39210: switch_to_locale() unloads all plugin and theme translations

[WordPress Trac]

#39210: switch_to_locale() unloads all plugin and theme translations
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 Reporter:  gchtr                                |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  Future
                                                 |  Release
Component:  I18N                                 |     Version:  4.7
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-unit-tests dev-      |     Focuses:
  feedback                                       |
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Comment (by msykes):

 As eluded to above, I've found the problem to be directly correlated with
 `_load_textdomain_just_in_time()` and how it checks the `$l10n_unloaded`
 which gets manipulated during `unload_textdomain()` during switching
 languages.

 I'm experiencing this issue but in a slightly different context. My issue
 is when using switch_to_locale(), restore_previous_locale() and then
 switch_to_locale() again. The first time round works for me, but the
 second time the text isn't translated.

 My use case is sending emails for bookings in different languages of the
 person making the booking.

 As a simple test, install Events Manager from WordPress.org and make sure
 Spanish is installed in the wp-content/languages folder. Then add this:

 {{{#!php
 <?php
 add_action('init', function(){
         global $locale;
         $domain = 'events-manager';
         $test_string = 'Quantity';
         $test_output = 'Current "'.$test_string.'" Translation in
 <code>%s</code> : %s<br>';
         echo sprintf($test_output, $locale, __($test_string, $domain));
         switch_to_locale('es_ES');
         echo sprintf($test_output, 'es_ES', __($test_string, $domain));
         restore_previous_locale();
         echo sprintf($test_output, $locale, __($test_string, $domain));
         // uncomment the following line to fii the problem
         //global $l10n_unloaded;
         //if( !empty($l10n_unloaded[$domain]) )
 unset($l10n_unloaded[$domain]);
         switch_to_locale('es_ES');
         echo sprintf($test_output, 'es_ES', __($test_string, $domain));
         die();
 });
 }}}

 The last line gets translated only if I uncomment those lines near the
 bottom.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39210#comment:19>
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