CRM/Core/Error.php

   1 <?php
   2
   3 /*
   4  +--------------------------------------------------------------------+
   5  | CiviCRM version 4.5                                                |
   6  +--------------------------------------------------------------------+
   7  | Copyright CiviCRM LLC (c) 2004-2014                                |
   8  +--------------------------------------------------------------------+
   9  | This file is a part of CiviCRM.                                    |
  10  |                                                                    |
  11  | CiviCRM is free software; you can copy, modify, and distribute it  |
  12  | under the terms of the GNU Affero General Public License           |
  13  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  14  |                                                                    |
  15  | CiviCRM is distributed in the hope that it will be useful, but     |
  16  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  17  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  18  | See the GNU Affero General Public License for more details.        |
  19  |                                                                    |
  20  | You should have received a copy of the GNU Affero General Public   |
  21  | License and the CiviCRM Licensing Exception along                  |
  22  | with this program; if not, contact CiviCRM LLC                     |
  23  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  24  | GNU Affero General Public License or the licensing of CiviCRM,     |
  25  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  26  +--------------------------------------------------------------------+
  27 */
  28
  29 /**
  30  * Start of the Error framework. We should check out and inherit from
  31  * PEAR_ErrorStack and use that framework
  32  *
  33  * @package CRM
  34  * @copyright CiviCRM LLC (c) 2004-2014
  35  * $Id$
  36  *
  37  */
  38
  39 require_once 'PEAR/ErrorStack.php';
  40 require_once 'PEAR/Exception.php';
  41 require_once 'CRM/Core/Exception.php';
  42
  43 require_once 'Log.php';
  44
  45 /**
  46  * Class CRM_Exception
  47  */
  48 class CRM_Exception extends PEAR_Exception {
  49   // Redefine the exception so message isn't optional
  50   /**
  51    * Supported signatures:
  52    *  - PEAR_Exception(string $message);
  53    *  - PEAR_Exception(string $message, int $code);
  54    *  - PEAR_Exception(string $message, Exception $cause);
  55    *  - PEAR_Exception(string $message, Exception $cause, int $code);
  56    *  - PEAR_Exception(string $message, PEAR_Error $cause);
  57    *  - PEAR_Exception(string $message, PEAR_Error $cause, int $code);
  58    *  - PEAR_Exception(string $message, array $causes);
  59    *  - PEAR_Exception(string $message, array $causes, int $code);
  60    *
  61    * @param string exception message
  62    * @param int $code
  63    * @param Exception $previous
  64    */
  65   public function __construct($message = NULL, $code = 0, Exception$previous = NULL) {
  66     parent::__construct($message, $code, $previous);
  67   }
  68 }
  69
  70 /**
  71  * Class CRM_Core_Error
  72  */
  73 class CRM_Core_Error extends PEAR_ErrorStack {
  74
  75   /**
  76    * Status code of various types of errors
  77    * @var const
  78    */
  79   CONST FATAL_ERROR = 2;
  80   CONST DUPLICATE_CONTACT = 8001;
  81   CONST DUPLICATE_CONTRIBUTION = 8002;
  82   CONST DUPLICATE_PARTICIPANT = 8003;
  83
  84   /**
  85    * We only need one instance of this object. So we use the singleton
  86    * pattern and cache the instance in this variable
  87    * @var object
  88    * @static
  89    */
  90   private static $_singleton = NULL;
  91
  92   /**
  93    * The logger object for this application
  94    * @var object
  95    * @static
  96    */
  97   private static $_log = NULL;
  98
  99   /**
 100    * If modeException == true, errors are raised as exception instead of returning civicrm_errors
 101    * @static
 102    */
 103   public static $modeException = NULL;
 104
 105   /**
 106    * Singleton function used to manage this object.
 107    *
 108    * @param null $package
 109    * @param bool $msgCallback
 110    * @param bool $contextCallback
 111    * @param bool $throwPEAR_Error
 112    * @param string $stackClass
 113    *
 114    * @return object
 115    * @static
 116    */
 117    static function &singleton($package = NULL, $msgCallback = FALSE, $contextCallback = FALSE, $throwPEAR_Error = FALSE, $stackClass = 'PEAR_ErrorStack') {
 118     if (self::$_singleton === NULL) {
 119       self::$_singleton = new CRM_Core_Error('CiviCRM');
 120     }
 121     return self::$_singleton;
 122   }
 123
 124   /**
 125    * Constructor
 126    */
 127   function __construct() {
 128     parent::__construct('CiviCRM');
 129
 130     $log = CRM_Core_Config::getLog();
 131     $this->setLogger($log);
 132
 133     // set up error handling for Pear Error Stack
 134     $this->setDefaultCallback(array($this, 'handlePES'));
 135   }
 136
 137   /**
 138    * @param $error
 139    * @param string $separator
 140    *
 141    * @return array|null|string
 142    */
 143   static public function getMessages(&$error, $separator = '<br />') {
 144     if (is_a($error, 'CRM_Core_Error')) {
 145       $errors = $error->getErrors();
 146       $message = array();
 147       foreach ($errors as $e) {
 148         $message[] = $e['code'] . ': ' . $e['message'];
 149       }
 150       $message = implode($separator, $message);
 151       return $message;
 152     }
 153     return NULL;
 154   }
 155
 156   /**
 157    * Status display function specific to payment processor errors
 158    * @param $error
 159    * @param string $separator
 160    */
 161   static function displaySessionError(&$error, $separator = '<br />') {
 162     $message = self::getMessages($error, $separator);
 163     if ($message) {
 164       $status = ts("Payment Processor Error message") . "{$separator} $message";
 165       $session = CRM_Core_Session::singleton();
 166       $session->setStatus($status);
 167     }
 168   }
 169
 170   /**
 171    * Create the main callback method. this method centralizes error processing.
 172    *
 173    * the errors we expect are from the pear modules DB, DB_DataObject
 174    * which currently use PEAR::raiseError to notify of error messages.
 175    *
 176    * @param object PEAR_Error
 177    *
 178    * @return void
 179    * @access public
 180    */
 181   public static function handle($pearError) {
 182
 183     // setup smarty with config, session and template location.
 184     $template = CRM_Core_Smarty::singleton();
 185     $config = CRM_Core_Config::singleton();
 186
 187     if ($config->backtrace) {
 188       self::backtrace();
 189     }
 190
 191     // create the error array
 192     $error               = array();
 193     $error['callback']   = $pearError->getCallback();
 194     $error['code']       = $pearError->getCode();
 195     $error['message']    = $pearError->getMessage();
 196     $error['mode']       = $pearError->getMode();
 197     $error['debug_info'] = $pearError->getDebugInfo();
 198     $error['type']       = $pearError->getType();
 199     $error['user_info']  = $pearError->getUserInfo();
 200     $error['to_string']  = $pearError->toString();
 201     if (function_exists('mysql_error') &&
 202       mysql_error()
 203     ) {
 204       $mysql_error = mysql_error() . ', ' . mysql_errno();
 205       $template->assign_by_ref('mysql_code', $mysql_error);
 206
 207       // execute a dummy query to clear error stack
 208       mysql_query('select 1');
 209     }
 210     elseif (function_exists('mysqli_error')) {
 211       $dao = new CRM_Core_DAO();
 212
 213       // we do it this way, since calling the function
 214       // getDatabaseConnection could potentially result
 215       // in an infinite loop
 216       global $_DB_DATAOBJECT;
 217       if (isset($_DB_DATAOBJECT['CONNECTIONS'][$dao->_database_dsn_md5])) {
 218         $conn = $_DB_DATAOBJECT['CONNECTIONS'][$dao->_database_dsn_md5];
 219         $link = $conn->connection;
 220
 221         if (mysqli_error($link)) {
 222           $mysql_error = mysqli_error($link) . ', ' . mysqli_errno($link);
 223           $template->assign_by_ref('mysql_code', $mysql_error);
 224
 225           // execute a dummy query to clear error stack
 226           mysqli_query($link, 'select 1');
 227         }
 228       }
 229     }
 230
 231     $template->assign_by_ref('error', $error);
 232     $errorDetails = CRM_Core_Error::debug('', $error, FALSE);
 233     $template->assign_by_ref('errorDetails', $errorDetails);
 234
 235     CRM_Core_Error::debug_var('Fatal Error Details', $error);
 236     CRM_Core_Error::backtrace('backTrace', TRUE);
 237
 238     if ($config->initialized) {
 239       $content = $template->fetch('CRM/common/fatal.tpl');
 240       echo CRM_Utils_System::theme($content);
 241     }
 242     else {
 243       echo "Sorry. A non-recoverable error has occurred. The error trace below might help to resolve the issue<p>";
 244       CRM_Core_Error::debug(NULL, $error);
 245     }
 246     static $runOnce = FALSE;
 247     if ($runOnce) {
 248       exit;
 249     }
 250     $runOnce = TRUE;
 251     self::abend(1);
 252   }
 253
 254   // this function is used to trap and print errors
 255   // during system initialization time. Hence the error
 256   // message is quite ugly
 257   /**
 258    * @param $pearError
 259    */
 260   public static function simpleHandler($pearError) {
 261
 262     // create the error array
 263     $error               = array();
 264     $error['callback']   = $pearError->getCallback();
 265     $error['code']       = $pearError->getCode();
 266     $error['message']    = $pearError->getMessage();
 267     $error['mode']       = $pearError->getMode();
 268     $error['debug_info'] = $pearError->getDebugInfo();
 269     $error['type']       = $pearError->getType();
 270     $error['user_info']  = $pearError->getUserInfo();
 271     $error['to_string']  = $pearError->toString();
 272
 273     // ensure that debug does not check permissions since we are in bootstrap
 274     // mode and need to print a decent message to help the user
 275     CRM_Core_Error::debug('Initialization Error', $error, TRUE, TRUE, FALSE);
 276
 277     // always log the backtrace to a file
 278     self::backtrace('backTrace', TRUE);
 279
 280     exit(0);
 281   }
 282
 283   /**
 284    * Handle errors raised using the PEAR Error Stack.
 285    *
 286    * currently the handler just requests the PES framework
 287    * to push the error to the stack (return value PEAR_ERRORSTACK_PUSH).
 288    *
 289    * Note: we can do our own error handling here and return PEAR_ERRORSTACK_IGNORE.
 290    *
 291    * Also, if we do not return any value the PEAR_ErrorStack::push() then does the
 292    * action of PEAR_ERRORSTACK_PUSHANDLOG which displays the errors on the screen,
 293    * since the logger set for this error stack is 'display' - see CRM_Core_Config::getLog();
 294    *
 295    */
 296   public static function handlePES($pearError) {
 297     return PEAR_ERRORSTACK_PUSH;
 298   }
 299
 300   /**
 301    * Display an error page with an error message describing what happened
 302    *
 303    * @param string $message the error message
 304    * @param string $code the error code if any
 305    * @param string $email the email address to notify of this situation
 306    *
 307    * @throws Exception
 308    *
 309    * @return void
 310    * @static
 311    * @access public
 312    */
 313   static function fatal($message = NULL, $code = NULL, $email = NULL) {
 314     $vars = array(
 315       'message' => $message,
 316       'code' => $code,
 317     );
 318
 319     if (self::$modeException) {
 320       // CRM-11043
 321       CRM_Core_Error::debug_var('Fatal Error Details', $vars);
 322       CRM_Core_Error::backtrace('backTrace', TRUE);
 323
 324       $details = 'A fatal error was triggered';
 325       if ($message) {
 326         $details .= ': ' . $message;
 327     }
 328       throw new Exception($details, $code);
 329     }
 330
 331     if (!$message) {
 332       $message = ts('We experienced an unexpected error. Please post a detailed description and the backtrace on the CiviCRM forums: %1', array(1 => 'http://forum.civicrm.org/'));
 333     }
 334
 335     if (php_sapi_name() == "cli") {
 336       print ("Sorry. A non-recoverable error has occurred.\n$message \n$code\n$email\n\n");
 337       debug_print_backtrace();
 338       die("\n");
 339       // FIXME: Why doesn't this call abend()?
 340       // Difference: abend() will cleanup transaction and (via civiExit) store session state
 341       // self::abend(CRM_Core_Error::FATAL_ERROR);
 342     }
 343
 344     $config = CRM_Core_Config::singleton();
 345
 346     if ($config->fatalErrorHandler &&
 347       function_exists($config->fatalErrorHandler)
 348     ) {
 349       $name = $config->fatalErrorHandler;
 350       $ret = $name($vars);
 351       if ($ret) {
 352         // the call has been successfully handled
 353         // so we just exit
 354         self::abend(CRM_Core_Error::FATAL_ERROR);
 355       }
 356     }
 357
 358     if ($config->backtrace) {
 359       self::backtrace();
 360     }
 361
 362     CRM_Core_Error::debug_var('Fatal Error Details', $vars);
 363     CRM_Core_Error::backtrace('backTrace', TRUE);
 364
 365     // If we are in an ajax callback, format output appropriately
 366     if (CRM_Utils_Array::value('snippet', $_REQUEST) === CRM_Core_Smarty::PRINT_JSON) {
 367       $out = array(
 368         'status' => 'fatal',
 369         'content' => '<div class="messages status no-popup"><div class="icon inform-icon"></div>' . ts('Sorry but we are not able to provide this at the moment.') . '</div>',
 370       );
 371       if ($config->backtrace && CRM_Core_Permission::check('view debug output')) {
 372         $out['backtrace'] = self::parseBacktrace(debug_backtrace());
 373         $message .= '<p><em>See console for backtrace</em></p>';
 374       }
 375       CRM_Core_Session::setStatus($message, ts('Sorry an Error Occured'), 'error');
 376       CRM_Core_Transaction::forceRollbackIfEnabled();
 377       CRM_Core_Page_AJAX::returnJsonResponse($out);
 378     }
 379
 380     $template = CRM_Core_Smarty::singleton();
 381     $template->assign($vars);
 382
 383     $config->userSystem->outputError($template->fetch($config->fatalErrorTemplate));
 384
 385     self::abend(CRM_Core_Error::FATAL_ERROR);
 386   }
 387
 388   /**
 389    * Display an error page with an error message describing what happened
 390    *
 391    * This function is evil -- it largely replicates fatal(). Hopefully the
 392    * entire CRM_Core_Error system can be hollowed out and replaced with
 393    * something that follows a cleaner separation of concerns.
 394    *
 395    * @param Exception $exception
 396    *
 397    * @return void
 398    * @static
 399    * @access public
 400    */
 401   static function handleUnhandledException($exception) {
 402     $config = CRM_Core_Config::singleton();
 403     $vars = array(
 404       'message' => $exception->getMessage(),
 405       'code' => NULL,
 406       'exception' => $exception,
 407     );
 408     if (!$vars['message']) {
 409       $vars['message'] = ts('We experienced an unexpected error. Please post a detailed description and the backtrace on the CiviCRM forums: %1', array(1 => 'http://forum.civicrm.org/'));
 410     }
 411
 412     // Case A: CLI
 413     if (php_sapi_name() == "cli") {
 414       printf("Sorry. A non-recoverable error has occurred.\n%s\n", $vars['message']);
 415       print self::formatTextException($exception);
 416       die("\n");
 417       // FIXME: Why doesn't this call abend()?
 418       // Difference: abend() will cleanup transaction and (via civiExit) store session state
 419       // self::abend(CRM_Core_Error::FATAL_ERROR);
 420     }
 421
 422     // Case B: Custom error handler
 423     if ($config->fatalErrorHandler &&
 424       function_exists($config->fatalErrorHandler)
 425     ) {
 426       $name = $config->fatalErrorHandler;
 427       $ret = $name($vars);
 428       if ($ret) {
 429         // the call has been successfully handled
 430         // so we just exit
 431         self::abend(CRM_Core_Error::FATAL_ERROR);
 432       }
 433     }
 434
 435     // Case C: Default error handler
 436
 437     // log to file
 438     CRM_Core_Error::debug_var('Fatal Error Details', $vars);
 439     CRM_Core_Error::backtrace('backTrace', TRUE);
 440
 441     // print to screen
 442     $template = CRM_Core_Smarty::singleton();
 443     $template->assign($vars);
 444     $content = $template->fetch($config->fatalErrorTemplate);
 445     if ($config->backtrace) {
 446       $content = self::formatHtmlException($exception) . $content;
 447     }
 448     if ($config->userFramework == 'Joomla' &&
 449       class_exists('JError')
 450     ) {
 451       JError::raiseError('CiviCRM-001', $content);
 452     }
 453     else {
 454       echo CRM_Utils_System::theme($content);
 455     }
 456
 457     // fin
 458     self::abend(CRM_Core_Error::FATAL_ERROR);
 459   }
 460
 461   /**
 462    * Outputs pre-formatted debug information. Flushes the buffers
 463    * so we can interrupt a potential POST/redirect
 464    *
 465    * @param  string name of debug section
 466    * @param  mixed  reference to variables that we need a trace of
 467    * @param  bool   should we log or return the output
 468    * @param  bool   whether to generate a HTML-escaped output
 469    * @param  bool   should we check permissions before displaying output
 470    *                useful when we die during initialization and permissioning
 471    *                subsystem is not initialized - CRM-13765
 472    *
 473    * @return string the generated output
 474    * @access public
 475    * @static
 476    */
 477   static function debug($name, $variable = NULL, $log = TRUE, $html = TRUE, $checkPermission = TRUE) {
 478     $error = self::singleton();
 479
 480     if ($variable === NULL) {
 481       $variable = $name;
 482       $name = NULL;
 483     }
 484
 485     $out = print_r($variable, TRUE);
 486     $prefix = NULL;
 487     if ($html) {
 488       $out = htmlspecialchars($out);
 489       if ($name) {
 490         $prefix = "<p>$name</p>";
 491       }
 492       $out = "{$prefix}<p><pre>$out</pre></p><p></p>";
 493     }
 494     else {
 495       if ($name) {
 496         $prefix = "$name:\n";
 497       }
 498       $out = "{$prefix}$out\n";
 499     }
 500     if (
 501       $log &&
 502       (!$checkPermission || CRM_Core_Permission::check('view debug output'))
 503     ) {
 504       echo $out;
 505     }
 506
 507     return $out;
 508   }
 509
 510   /**
 511    * Similar to the function debug. Only difference is
 512    * in the formatting of the output.
 513    *
 514    * @param string $variable_name
 515    * @param mixed $variable
 516    * @param bool $print should we use print_r ? (else we use var_dump)
 517    * @param bool $log should we log or return the output
 518    * @param string $comp variable name
 519    *
 520    * @return string the generated output
 521    *
 522    * @access public
 523    *
 524    * @static
 525    *
 526    * @see CRM_Core_Error::debug()
 527    * @see CRM_Core_Error::debug_log_message()
 528    */
 529   static function debug_var($variable_name,
 530     $variable,
 531     $print = TRUE,
 532     $log   = TRUE,
 533     $comp  = ''
 534   ) {
 535     // check if variable is set
 536     if (!isset($variable)) {
 537       $out = "\$$variable_name is not set";
 538     }
 539     else {
 540       if ($print) {
 541         $out = print_r($variable, TRUE);
 542         $out = "\$$variable_name = $out";
 543       }
 544       else {
 545         // use var_dump
 546         ob_start();
 547         var_dump($variable);
 548         $dump = ob_get_contents();
 549         ob_end_clean();
 550         $out = "\n\$$variable_name = $dump";
 551       }
 552       // reset if it is an array
 553       if (is_array($variable)) {
 554         reset($variable);
 555       }
 556     }
 557     return self::debug_log_message($out, FALSE, $comp);
 558   }
 559
 560   /**
 561    * Display the error message on terminal
 562    *
 563    * @param $message
 564    * @param bool $out should we log or return the output
 565    *
 566    * @param string $comp message to be output
 567    * @return string format of the backtrace
 568    *
 569    * @access public
 570    *
 571    * @static
 572    */
 573   static function debug_log_message($message, $out = FALSE, $comp = '') {
 574     $config = CRM_Core_Config::singleton();
 575
 576     $file_log = self::createDebugLogger($comp);
 577     $file_log->log("$message\n");
 578     $str = "<p/><code>$message</code>";
 579     if ($out && CRM_Core_Permission::check('view debug output')) {
 580       echo $str;
 581     }
 582     $file_log->close();
 583
 584     if ($config->userFrameworkLogging) {
 585       // should call $config->userSystem->logger($message) here - but I got a situation where userSystem was not an object - not sure why
 586       if ($config->userSystem->is_drupal and function_exists('watchdog')) {
 587         watchdog('civicrm', $message, NULL, WATCHDOG_DEBUG);
 588       }
 589     }
 590
 591     return $str;
 592   }
 593
 594   /**
 595    * Append to the query log (if enabled)
 596    */
 597   static function debug_query($string) {
 598     if ( defined( 'CIVICRM_DEBUG_LOG_QUERY' ) ) {
 599       if ( CIVICRM_DEBUG_LOG_QUERY == 'backtrace' ) {
 600         CRM_Core_Error::backtrace( $string, true );
 601       } else if ( CIVICRM_DEBUG_LOG_QUERY ) {
 602         CRM_Core_Error::debug_var( 'Query', $string, false, true );
 603       }
 604     }
 605   }
 606
 607   /**
 608    * Obtain a reference to the error log
 609    *
 610    * @param string $comp
 611    *
 612    * @return Log
 613    */
 614   static function createDebugLogger($comp = '') {
 615     $config = CRM_Core_Config::singleton();
 616
 617     if ($comp) {
 618       $comp = $comp . '.';
 619     }
 620
 621     $fileName = "{$config->configAndLogDir}CiviCRM." . $comp . md5($config->dsn) . '.log';
 622
 623     // Roll log file monthly or if greater than 256M
 624     // note that PHP file functions have a limit of 2G and hence
 625     // the alternative was introduce
 626     if (file_exists($fileName)) {
 627       $fileTime = date("Ym", filemtime($fileName));
 628       $fileSize = filesize($fileName);
 629       if (($fileTime < date('Ym')) ||
 630         ($fileSize > 256 * 1024 * 1024) ||
 631         ($fileSize < 0)
 632       ) {
 633         rename($fileName,
 634           $fileName . '.' . date('Ymdhs', mktime(0, 0, 0, date("m") - 1, date("d"), date("Y")))
 635         );
 636       }
 637     }
 638
 639     return Log::singleton('file', $fileName);
 640   }
 641
 642   /**
 643    * @param string $msg
 644    * @param bool $log
 645    */
 646   static function backtrace($msg = 'backTrace', $log = FALSE) {
 647     $backTrace = debug_backtrace();
 648     $message = self::formatBacktrace($backTrace);
 649     if (!$log) {
 650       CRM_Core_Error::debug($msg, $message);
 651     }
 652     else {
 653       CRM_Core_Error::debug_var($msg, $message);
 654     }
 655   }
 656
 657   /**
 658    * Render a backtrace array as a string
 659    *
 660    * @param array $backTrace array of stack frames
 661    * @param boolean $showArgs TRUE if we should try to display content of function arguments (which could be sensitive); FALSE to display only the type of each function argument
 662    * @param int $maxArgLen maximum number of characters to show from each argument string
 663    * @return string printable plain-text
 664    */
 665   static function formatBacktrace($backTrace, $showArgs = TRUE, $maxArgLen = 80) {
 666     $message = '';
 667     foreach (self::parseBacktrace($backTrace, $showArgs, $maxArgLen) as $idx => $trace) {
 668       $message .= sprintf("#%s %s\n", $idx, $trace);
 669     }
 670     $message .= sprintf("#%s {main}\n", 1+$idx);
 671     return $message;
 672   }
 673
 674   /**
 675    * Render a backtrace array as an array
 676    *
 677    * @param array $backTrace array of stack frames
 678    * @param boolean $showArgs TRUE if we should try to display content of function arguments (which could be sensitive); FALSE to display only the type of each function argument
 679    * @param int $maxArgLen maximum number of characters to show from each argument string
 680    * @return array
 681    * @see debug_backtrace
 682    * @see Exception::getTrace()
 683    */
 684   static function parseBacktrace($backTrace, $showArgs = TRUE, $maxArgLen = 80) {
 685     $ret = array();
 686     foreach ($backTrace as $trace) {
 687       $args = array();
 688       $fnName = CRM_Utils_Array::value('function', $trace);
 689       $className = isset($trace['class']) ? ($trace['class'] . $trace['type']) : '';
 690
 691       // Do not show args for a few password related functions
 692       $skipArgs = ($className == 'DB::' && $fnName == 'connect') ? TRUE : FALSE;
 693
 694       if (!empty($trace['args'])) {
 695         foreach ($trace['args'] as $arg) {
 696           if (! $showArgs || $skipArgs) {
 697             $args[] = '(' . gettype($arg) . ')';
 698             continue;
 699           }
 700           switch ($type = gettype($arg)) {
 701             case 'boolean':
 702               $args[] = $arg ? 'TRUE' : 'FALSE';
 703               break;
 704             case 'integer':
 705             case 'double':
 706               $args[] = $arg;
 707               break;
 708             case 'string':
 709               $args[] = '"' . CRM_Utils_String::ellipsify(addcslashes((string) $arg, "\r\n\t\""), $maxArgLen). '"';
 710               break;
 711             case 'array':
 712               $args[] = '(Array:'.count($arg).')';
 713               break;
 714             case 'object':
 715               $args[] = 'Object(' . get_class($arg) . ')';
 716               break;
 717             case 'resource':
 718               $args[] = 'Resource';
 719               break;
 720             case 'NULL':
 721               $args[] = 'NULL';
 722               break;
 723             default:
 724               $args[] = "($type)";
 725               break;
 726           }
 727         }
 728       }
 729
 730       $ret[] = sprintf(
 731         "%s(%s): %s%s(%s)",
 732         CRM_Utils_Array::value('file', $trace, '[internal function]'),
 733         CRM_Utils_Array::value('line', $trace, ''),
 734         $className,
 735         $fnName,
 736         implode(", ", $args)
 737       );
 738     }
 739     return $ret;
 740   }
 741
 742   /**
 743    * Render an exception as HTML string
 744    *
 745    * @param Exception $e
 746    * @return string printable HTML text
 747    */
 748   static function formatHtmlException(Exception $e) {
 749     $msg = '';
 750
 751     // Exception metadata
 752
 753     // Exception backtrace
 754     if ($e instanceof PEAR_Exception) {
 755       $ei = $e;
 756       while (is_callable(array($ei, 'getCause'))) {
 757         if ($ei->getCause() instanceof PEAR_Error) {
 758           $msg .= '<table class="crm-db-error">';
 759           $msg .= sprintf('<thead><tr><th>%s</th><th>%s</th></tr></thead>', ts('Error Field'), ts('Error Value'));
 760           $msg .= '<tbody>';
 761           foreach (array('Type', 'Code', 'Message', 'Mode', 'UserInfo', 'DebugInfo') as $f) {
 762             $msg .= sprintf('<tr><td>%s</td><td>%s</td></tr>', $f, call_user_func(array($ei->getCause(), "get$f")));
 763     }
 764           $msg .= '</tbody></table>';
 765     }
 766         $ei = $ei->getCause();
 767   }
 768       $msg .= $e->toHtml();
 769     } else {
 770       $msg .= '<p><b>' . get_class($e) . ': "' . htmlentities($e->getMessage()) . '"</b></p>';
 771       $msg .= '<pre>' . htmlentities(self::formatBacktrace($e->getTrace())) . '</pre>';
 772     }
 773     return $msg;
 774   }
 775
 776   /**
 777    * Write details of an exception to the log
 778    *
 779    * @param Exception $e
 780    * @return string printable plain text
 781    */
 782   static function formatTextException(Exception $e) {
 783     $msg = get_class($e) . ": \"" . $e->getMessage() . "\"\n";
 784
 785     $ei = $e;
 786     while (is_callable(array($ei, 'getCause'))) {
 787       if ($ei->getCause() instanceof PEAR_Error) {
 788         foreach (array('Type', 'Code', 'Message', 'Mode', 'UserInfo', 'DebugInfo') as $f) {
 789           $msg .= sprintf(" * ERROR %s: %s\n", strtoupper($f), call_user_func(array($ei->getCause(), "get$f")));
 790         }
 791       }
 792       $ei = $ei->getCause();
 793     }
 794     $msg .= self::formatBacktrace($e->getTrace());
 795     return $msg;
 796   }
 797
 798   /**
 799    * @param $message
 800    * @param int $code
 801    * @param string $level
 802    * @param array $params
 803    *
 804    * @return object
 805    */
 806   static function createError($message, $code = 8000, $level = 'Fatal', $params = NULL) {
 807     $error = CRM_Core_Error::singleton();
 808     $error->push($code, $level, array($params), $message);
 809     return $error;
 810   }
 811
 812   /**
 813    * Set a status message in the session, then bounce back to the referrer.
 814    *
 815    * @param string $status The status message to set
 816    *
 817    * @param null $redirect
 818    * @param string $title
 819    * @return void
 820    * @access public
 821    * @static
 822    */
 823   public static function statusBounce($status, $redirect = NULL, $title = NULL) {
 824     $session = CRM_Core_Session::singleton();
 825     if (!$redirect) {
 826       $redirect = $session->readUserContext();
 827     }
 828     if ($title === NULL) {
 829       $title = ts('Error');
 830     }
 831     $session->setStatus($status, $title, 'alert', array('expires' => 0));
 832     if (CRM_Utils_Array::value('snippet', $_REQUEST) === CRM_Core_Smarty::PRINT_JSON) {
 833       CRM_Core_Page_AJAX::returnJsonResponse(array('status' => 'error'));
 834     }
 835     CRM_Utils_System::redirect($redirect);
 836   }
 837
 838   /**
 839    * Reset the error stack
 840    *
 841    * @access public
 842    * @static
 843    */
 844   public static function reset() {
 845     $error = self::singleton();
 846     $error->_errors = array();
 847     $error->_errorsByLevel = array();
 848   }
 849
 850   /**
 851    * PEAR error-handler which converts errors to exceptions
 852    *
 853    * @param $pearError
 854    * @throws PEAR_Exception
 855    */
 856   public static function exceptionHandler($pearError) {
 857     CRM_Core_Error::backtrace('backTrace', TRUE);
 858     throw new PEAR_Exception($pearError->getMessage(), $pearError);
 859   }
 860
 861   /**
 862    * PEAR error-handler to quietly catch otherwise fatal errors. Intended for use with smtp transport.
 863    *
 864    * @param object $obj       The PEAR_ERROR object
 865    * @return object $obj
 866    * @access public
 867    * @static
 868    */
 869   public static function nullHandler($obj) {
 870     CRM_Core_Error::debug_log_message("Ignoring exception thrown by nullHandler: {$obj->code}, {$obj->message}");
 871     CRM_Core_Error::backtrace('backTrace', TRUE);
 872     return $obj;
 873   }
 874
 875   /*
 876    * @deprecated
 877    * This function is no longer used by v3 api.
 878    * @fixme Some core files call it but it should be re-thought & renamed or removed
 879    */
 880   /**
 881    * @param $msg
 882    * @param null $data
 883    *
 884    * @return array
 885    * @throws Exception
 886    */
 887   public static function &createAPIError($msg, $data = NULL) {
 888     if (self::$modeException) {
 889       throw new Exception($msg, $data);
 890     }
 891
 892     $values = array();
 893
 894     $values['is_error'] = 1;
 895     $values['error_message'] = $msg;
 896     if (isset($data)) {
 897       $values = array_merge($values, $data);
 898     }
 899     return $values;
 900   }
 901
 902   /**
 903    * @param $file
 904    */
 905   public static function movedSiteError($file) {
 906     $url = CRM_Utils_System::url('civicrm/admin/setting/updateConfigBackend',
 907       'reset=1',
 908       TRUE
 909     );
 910     echo "We could not write $file. Have you moved your site directory or server?<p>";
 911     echo "Please fix the setting by running the <a href=\"$url\">update config script</a>";
 912     exit();
 913   }
 914
 915   /**
 916    * Terminate execution abnormally
 917    */
 918   protected static function abend($code) {
 919     // do a hard rollback of any pending transactions
 920     // if we've come here, its because of some unexpected PEAR errors
 921     CRM_Core_Transaction::forceRollbackIfEnabled();
 922     CRM_Utils_System::civiExit($code);
 923   }
 924
 925   /**
 926    * @param $error
 927    * @param const $type
 928    *
 929    * @return bool
 930    */
 931   public static function isAPIError($error, $type = CRM_Core_Error::FATAL_ERROR) {
 932     if (is_array($error) && !empty($error['is_error'])) {
 933       $code = $error['error_message']['code'];
 934       if ($code == $type) {
 935         return TRUE;
 936       }
 937     }
 938     return FALSE;
 939   }
 940 }
 941
 942 $e = new PEAR_ErrorStack('CRM');
 943 $e->singleton('CRM', FALSE, NULL, 'CRM_Core_Error');