In this chapter, we will study about Drupal error handling for managing error messages on Drupal site.
Error Handling is a process of detection and finding the resolutions for the errors, this can be programming application errors or communicable errors.
The below steps describe managing error messages in Drupal:
Step (1): Go to Configuration and click on Logging and errors.
Step (2): Next, Logging and errors page will get displayed as shown below.
The fields as seen the above screen are discussed below:
The code for _drupal_exception_handler will be shown as below:
There are two string references to _drupal_exception_handler such as _drupal_bootstrap_configuration() present in the bootstrap.inc file and _drupal_get_last_caller present in the errors.inc file. Both these files are present in the includes folder.
Error Handling is a process of detection and finding the resolutions for the errors, this can be programming application errors or communicable errors.
The below steps describe managing error messages in Drupal:
Step (1): Go to Configuration and click on Logging and errors.
Step (2): Next, Logging and errors page will get displayed as shown below.
The fields as seen the above screen are discussed below:
- Error messages to display: It specifies error messages to be displayed on the Drupal site.
- None option doesn't display any error message.
- Errors and warnings option displays only messages related to errors and warnings.
- All messages option specifies all the error messages such as errors, warnings etc to be displayed on the site.
- Database log messages to keep: It indicates the maximum number of messages to kept in the database log.
The code for _drupal_exception_handler will be shown as below:
function _drupal_exception_handler($exception) { require_once DRUPAL_ROOT . '/includes/errors.inc'; try { // display the error message in the log and return the error messages to the user _drupal_log_error(_drupal_decode_exception($exception), TRUE); } catch (Exception $excp2) { // Another uncaught exception was thrown while handling the first one. // If we are displaying errors, then do so with no possibility of a further uncaught exception being thrown. if (error_displayable()) { print '<h1>Additional uncaught exception thrown while handling exception.</h1>'; print '<h2>Original</h2><p>' . _drupal_render_exception_safe($exception) . '</p>'; print '<h2>Additional</h2><p>' . _drupal_render_exception_safe($excp2) . '</p><hr />'; } } }The function must be used on every Drupal request. This function is present at the line 2328 in the file includes/bootstrap.inc .
There are two string references to _drupal_exception_handler such as _drupal_bootstrap_configuration() present in the bootstrap.inc file and _drupal_get_last_caller present in the errors.inc file. Both these files are present in the includes folder.
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