Drupal 7 вывод ошибки

Drupal надстраивает собственные разрешения на вывод ошибок, потому если вам необходим вывод ошибок на этапе разработки, то важно знать как разрешить их показ/протоколирование.

Чтобы не разбираться в конфигурации конкретно вашего веб-сервера, воспользуемся командами ini_set и error_reporting для настройки вывода PHP ошибок уже во время исполнения скрипта.

Инструкции нужно добавить в файл конфигурации вашего Drupal сайта (по умолчанию это — /sites/default/settings.php).

Это не гарантирует вывод ошибок, т.к. Drupal может иметь собственные настройки. Их можно изменить в админ панели — вот тут /admin/config/development/logging или жестко зафиксировав в конфигурации:

Это будет соответствовать выбору ‘All messages’ в админке.

Drupal 7

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Set Drupal to show all errors when developing your module.

Some errors are only reported when all PHP error reporting is switched on. Without the error reporting on, you get the dreaded White Screen of Death.

Check for errors behind the scenes

As an alternative between showing no errors and showing all errors, you may wish to monitor the errors being generated by your site by running

tail -f /var/log/apache2/error.log

on your server.

Change settings in your dev site

You can show all errors by adding a few lines to your local testing site’s settings.php:

error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);

In addition, navigate to Administration→ Configuration→ Development → logging and errors and select «All messages». (This sets $conf['error_level'] = 2;.)

Switch on strict PHP error reporting

Or you can go through your development site’s php.ini file, in the php folder, and switch all error reporting on. To do this, check through your php.ini file and set error_reporting to E_ALL. The documentation there is very thorough, and you may find a different setting that’s better suited to your needs. Warning: as the PHP documentation states, this setting is only for development sites, not for production sites.

In drupal 7 we can log message by following method:

drupal watchdog function we can use to log message in database , make sure we have enabled optional core module for Database Logging at /admin/build/modules.

watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL)

$type:
The category to which this message belongs , Example: PHP,cron.., we can filter message by type.

$message :
The message to store in the log,Example: ‘The following module is missing from the file system: security_review’

$variables :
Array of variables to replace in the message on display or NULL if message is already translated or not possible to translate.
to make message translated , do not pass dynamic value pass variables in the message should be added by using placeholder strings.

Example:
watchdog(‘cg_volunteer’, ‘cg in form_alter %formly’, array(‘%formly’ => $form[‘#id’]), WATCHDOG_NOTICE, $link = NULL);

$severity
The severity of the message,logs can be filter by severity as per RFC 3164. Possible values are WATCHDOG_ERROR, WATCHDOG_WARNING, etc.
For more example see https://api.drupal.org/api/drupal/includes!bootstrap.inc/function/watchdog/7.x

$link:
A link to associate with the message.

Example

// for logs notices

watchdog('my_module', $message, array());

// for Loging Error

watchdog('my_module', $message, array(), WATCHDOG_ERROR);

In drupal 8 we used following method:

// For Logs a notice.

Drupal::logger('my_module')->notice($message);

// For Logs an error.

Drupal::logger('my_module')->error($message);

// For Alert, action must be taken immediately.

Drupal::logger('my_module')->alert($message);

// For Critical message.

Drupal::logger('my_module')->critical($message);

// For Debug-level messages.

Drupal::logger('my_module')->debug($message);

//For Emergency, system is unusable.

Drupal::logger('my_module')->emergency($message);

//For Warning

Drupal::logger('my_module')->warning($message);

//For Informational messages.

Drupal::logger('my_module')->info($message);

Also for translate we should not use t() function.

Drupal::logger('my_module')->alert('Message from @module: @message.', [
'@module' => $module,
'@message' => $message,
]);

this will be translated on run time.

Example :

Drupal::logger('content_entity_example')->notice('@type: deleted %title.',
array(
'@type' => $this->entity->bundle(),
'%title' => $this->entity->label(),
));