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<?php
/**
* @file
* Functions for error handling.
*/
/**
* Error reporting level: display no errors.
*/
define('ERROR_REPORTING_HIDE', 0);
/**
* Error reporting level: display errors and warnings.
*/
define('ERROR_REPORTING_DISPLAY_SOME', 1);
/**
* Error reporting level: display all messages.
*/
define('ERROR_REPORTING_DISPLAY_ALL', 2);
/**
* Maps PHP error constants to watchdog severity levels.
*
* The error constants are documented at
* http://php.net/manual/en/errorfunc.constants.php
*
* @ingroup logging_severity_levels
*/
function drupal_error_levels() {
$types = array(
E_ERROR => array('Error', WATCHDOG_ERROR),
E_WARNING => array('Warning', WATCHDOG_WARNING),
E_PARSE => array('Parse error', WATCHDOG_ERROR),
E_NOTICE => array('Notice', WATCHDOG_NOTICE),
E_CORE_ERROR => array('Core error', WATCHDOG_ERROR),
E_CORE_WARNING => array('Core warning', WATCHDOG_WARNING),
E_COMPILE_ERROR => array('Compile error', WATCHDOG_ERROR),
E_COMPILE_WARNING => array('Compile warning', WATCHDOG_WARNING),
E_USER_ERROR => array('User error', WATCHDOG_ERROR),
E_USER_WARNING => array('User warning', WATCHDOG_WARNING),
E_USER_NOTICE => array('User notice', WATCHDOG_NOTICE),
E_STRICT => array('Strict warning', WATCHDOG_DEBUG),
E_RECOVERABLE_ERROR => array('Recoverable fatal error', WATCHDOG_ERROR),
);
// E_DEPRECATED and E_USER_DEPRECATED were added in PHP 5.3.0.
if (defined('E_DEPRECATED')) {
$types[E_DEPRECATED] = array('Deprecated function', WATCHDOG_DEBUG);
$types[E_USER_DEPRECATED] = array('User deprecated function', WATCHDOG_DEBUG);
}
return $types;
}
/**
* Provides custom PHP error handling.
*
* @param $error_level
* The level of the error raised.
* @param $message
* The error message.
* @param $filename
* The filename that the error was raised in.
* @param $line
* The line number the error was raised at.
* @param $context
* An array that points to the active symbol table at the point the error
* occurred.
*/
function _drupal_error_handler_real($error_level, $message, $filename, $line, $context) {
if ($error_level & error_reporting()) {
$types = drupal_error_levels();
list($severity_msg, $severity_level) = $types[$error_level];
$caller = _drupal_get_last_caller(debug_backtrace());
if (!function_exists('filter_xss_admin')) {
require_once DRUPAL_ROOT . '/includes/common.inc';
}
// We treat recoverable errors as fatal.
_drupal_log_error(array(
'%type' => isset($types[$error_level]) ? $severity_msg : 'Unknown error',
// The standard PHP error handler considers that the error messages
// are HTML. We mimick this behavior here.
'!message' => filter_xss_admin($message),
'%function' => $caller['function'],
'%file' => $caller['file'],
'%line' => $caller['line'],
'severity_level' => $severity_level,
), $error_level == E_RECOVERABLE_ERROR);
}
}
/**
* Decodes an exception and retrieves the correct caller.
*
* @param $exception
* The exception object that was thrown.
*
* @return
* An error in the format expected by _drupal_log_error().
*/
function _drupal_decode_exception($exception) {
$message = $exception->getMessage();
$backtrace = $exception->getTrace();
// Add the line throwing the exception to the backtrace.
array_unshift($backtrace, array('line' => $exception->getLine(), 'file' => $exception->getFile()));
// For PDOException errors, we try to return the initial caller,
// skipping internal functions of the database layer.
if ($exception instanceof PDOException) {
// The first element in the stack is the call, the second element gives us the caller.
// We skip calls that occurred in one of the classes of the database layer
// or in one of its global functions.
$db_functions = array('db_query', 'db_query_range');
while (!empty($backtrace[1]) && ($caller = $backtrace[1]) &&
((isset($caller['class']) && (strpos($caller['class'], 'Query') !== FALSE || strpos($caller['class'], 'Database') !== FALSE || strpos($caller['class'], 'PDO') !== FALSE)) ||
in_array($caller['function'], $db_functions))) {
// We remove that call.
array_shift($backtrace);
}
if (isset($exception->query_string, $exception->args)) {
$message .= ": " . $exception->query_string . "; " . print_r($exception->args, TRUE);
}
}
$caller = _drupal_get_last_caller($backtrace);
return array(
'%type' => get_class($exception),
// The standard PHP exception handler considers that the exception message
// is plain-text. We mimick this behavior here.
'!message' => check_plain($message),
'%function' => $caller['function'],
'%file' => $caller['file'],
'%line' => $caller['line'],
'severity_level' => WATCHDOG_ERROR,
);
}
/**
* Renders an exception error message without further exceptions.
*
* @param $exception
* The exception object that was thrown.
* @return
* An error message.
*/
function _drupal_render_exception_safe($exception) {
return check_plain(strtr('%type: !message in %function (line %line of %file).', _drupal_decode_exception($exception)));
}
/**
* Determines whether an error should be displayed.
*
* When in maintenance mode or when error_level is ERROR_REPORTING_DISPLAY_ALL,
* all errors should be displayed. For ERROR_REPORTING_DISPLAY_SOME, $error
* will be examined to determine if it should be displayed.
*
* @param $error
* Optional error to examine for ERROR_REPORTING_DISPLAY_SOME.
*
* @return
* TRUE if an error should be displayed.
*/
function error_displayable($error = NULL) {
$error_level = variable_get('error_level', ERROR_REPORTING_DISPLAY_ALL);
$updating = (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'update');
$all_errors_displayed = ($error_level == ERROR_REPORTING_DISPLAY_ALL);
$error_needs_display = ($error_level == ERROR_REPORTING_DISPLAY_SOME &&
isset($error) && $error['%type'] != 'Notice' && $error['%type'] != 'Strict warning');
return ($updating || $all_errors_displayed || $error_needs_display);
}
/**
* Logs a PHP error or exception and displays an error page in fatal cases.
*
* @param $error
* An array with the following keys: %type, !message, %function, %file, %line
* and severity_level. All the parameters are plain-text, with the exception
* of !message, which needs to be a safe HTML string.
* @param $fatal
* TRUE if the error is fatal.
*/
function _drupal_log_error($error, $fatal = FALSE) {
// Initialize a maintenance theme if the boostrap was not complete.
// Do it early because drupal_set_message() triggers a drupal_theme_initialize().
if ($fatal && (drupal_get_bootstrap_phase() != DRUPAL_BOOTSTRAP_FULL)) {
unset($GLOBALS['theme']);
if (!defined('MAINTENANCE_MODE')) {
define('MAINTENANCE_MODE', 'error');
}
drupal_maintenance_theme();
}
// When running inside the testing framework, we relay the errors
// to the tested site by the way of HTTP headers.
$test_info = &$GLOBALS['drupal_test_info'];
if (!empty($test_info['in_child_site']) && !headers_sent() && (!defined('SIMPLETEST_COLLECT_ERRORS') || SIMPLETEST_COLLECT_ERRORS)) {
// $number does not use drupal_static as it should not be reset
// as it uniquely identifies each PHP error.
static $number = 0;
$assertion = array(
$error['!message'],
$error['%type'],
array(
'function' => $error['%function'],
'file' => $error['%file'],
'line' => $error['%line'],
),
);
header('X-Drupal-Assertion-' . $number . ': ' . rawurlencode(serialize($assertion)));
$number++;
}
watchdog('php', '%type: !message in %function (line %line of %file).', $error, $error['severity_level']);
if ($fatal) {
drupal_add_http_header('Status', '500 Service unavailable (with message)');
}
if (drupal_is_cli()) {
if ($fatal) {
// When called from CLI, simply output a plain text message.
print html_entity_decode(strip_tags(t('%type: !message in %function (line %line of %file).', $error))). "\n";
exit;
}
}
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest') {
if ($fatal) {
if (error_displayable($error)) {
// When called from JavaScript, simply output the error message.
print t('%type: !message in %function (line %line of %file).', $error);
}
exit;
}
}
else {
// Display the message if the current error reporting level allows this type
// of message to be displayed, and unconditionnaly in update.php.
if (error_displayable($error)) {
$class = 'error';
// If error type is 'User notice' then treat it as debug information
// instead of an error message, see dd().
if ($error['%type'] == 'User notice') {
$error['%type'] = 'Debug';
$class = 'status';
}
drupal_set_message(t('%type: !message in %function (line %line of %file).', $error), $class);
}
if ($fatal) {
drupal_set_title(t('Error'));
// We fallback to a maintenance page at this point, because the page generation
// itself can generate errors.
print theme('maintenance_page', array('content' => t('The website encountered an unexpected error. Please try again later.')));
exit;
}
}
}
/**
* Gets the last caller from a backtrace.
*
* @param $backtrace
* A standard PHP backtrace.
*
* @return
* An associative array with keys 'file', 'line' and 'function'.
*/
function _drupal_get_last_caller($backtrace) {
// Errors that occur inside PHP internal functions do not generate
// information about file and line. Ignore black listed functions.
$blacklist = array('debug', '_drupal_error_handler', '_drupal_exception_handler');
while (($backtrace && !isset($backtrace[0]['line'])) ||
(isset($backtrace[1]['function']) && in_array($backtrace[1]['function'], $blacklist))) {
array_shift($backtrace);
}
// The first trace is the call itself.
// It gives us the line and the file of the last call.
$call = $backtrace[0];
// The second call give us the function where the call originated.
if (isset($backtrace[1])) {
if (isset($backtrace[1]['class'])) {
$call['function'] = $backtrace[1]['class'] . $backtrace[1]['type'] . $backtrace[1]['function'] . '()';
}
else {
$call['function'] = $backtrace[1]['function'] . '()';
}
}
else {
$call['function'] = 'main()';
}
return $call;
}
