includes/Exception.php

   1 <?php
   2 /**
   3  * Exception class and handler.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * @defgroup Exception Exception
  25  */
  26
  27 /**
  28  * MediaWiki exception
  29  *
  30  * @ingroup Exception
  31  */
  32 class MWException extends Exception {
  33         var $logId;
  34
  35         /**
  36          * Should the exception use $wgOut to output the error?
  37          *
  38          * @return bool
  39          */
  40         function useOutputPage() {
  41                 return $this->useMessageCache() &&
  42                         !empty( $GLOBALS['wgFullyInitialised'] ) &&
  43                         !empty( $GLOBALS['wgOut'] ) &&
  44                         !empty( $GLOBALS['wgTitle'] );
  45         }
  46
  47         /**
  48          * Can the extension use the Message class/wfMessage to get i18n-ed messages?
  49          *
  50          * @return bool
  51          */
  52         function useMessageCache() {
  53                 global $wgLang;
  54
  55                 foreach ( $this->getTrace() as $frame ) {
  56                         if ( isset( $frame['class'] ) && $frame['class'] === 'LocalisationCache' ) {
  57                                 return false;
  58                         }
  59                 }
  60
  61                 return $wgLang instanceof Language;
  62         }
  63
  64         /**
  65          * Run hook to allow extensions to modify the text of the exception
  66          *
  67          * @param string $name class name of the exception
  68          * @param array $args arguments to pass to the callback functions
  69          * @return string|null string to output or null if any hook has been called
  70          */
  71         function runHooks( $name, $args = array() ) {
  72                 global $wgExceptionHooks;
  73
  74                 if ( !isset( $wgExceptionHooks ) || !is_array( $wgExceptionHooks ) ) {
  75                         return null; // Just silently ignore
  76                 }
  77
  78                 if ( !array_key_exists( $name, $wgExceptionHooks ) || !is_array( $wgExceptionHooks[$name] ) ) {
  79                         return null;
  80                 }
  81
  82                 $hooks = $wgExceptionHooks[$name];
  83                 $callargs = array_merge( array( $this ), $args );
  84
  85                 foreach ( $hooks as $hook ) {
  86                         if ( is_string( $hook ) || ( is_array( $hook ) && count( $hook ) >= 2 && is_string( $hook[0] ) ) ) { // 'function' or array( 'class', hook' )
  87                                 $result = call_user_func_array( $hook, $callargs );
  88                         } else {
  89                                 $result = null;
  90                         }
  91
  92                         if ( is_string( $result ) ) {
  93                                 return $result;
  94                         }
  95                 }
  96                 return null;
  97         }
  98
  99         /**
 100          * Get a message from i18n
 101          *
 102          * @param string $key message name
 103          * @param string $fallback default message if the message cache can't be
 104          *                  called by the exception
 105          * The function also has other parameters that are arguments for the message
 106          * @return string message with arguments replaced
 107          */
 108         function msg( $key, $fallback /*[, params...] */ ) {
 109                 $args = array_slice( func_get_args(), 2 );
 110
 111                 if ( $this->useMessageCache() ) {
 112                         return wfMessage( $key, $args )->plain();
 113                 } else {
 114                         return wfMsgReplaceArgs( $fallback, $args );
 115                 }
 116         }
 117
 118         /**
 119          * If $wgShowExceptionDetails is true, return a HTML message with a
 120          * backtrace to the error, otherwise show a message to ask to set it to true
 121          * to show that information.
 122          *
 123          * @return string html to output
 124          */
 125         function getHTML() {
 126                 global $wgShowExceptionDetails;
 127
 128                 if ( $wgShowExceptionDetails ) {
 129                         return '<p>' . nl2br( htmlspecialchars( $this->getMessage() ) ) .
 130                                 '</p><p>Backtrace:</p><p>' . nl2br( htmlspecialchars( MWExceptionHandler::formatRedactedTrace( $this ) ) ) .
 131                                 "</p>\n";
 132                 } else {
 133                         return "<div class=\"errorbox\">" .
 134                                 '[' . $this->getLogId() . '] ' .
 135                                 gmdate( 'Y-m-d H:i:s' ) .
 136                                 ": Fatal exception of type " . get_class( $this ) . "</div>\n" .
 137                                 "<!-- Set \$wgShowExceptionDetails = true; " .
 138                                 "at the bottom of LocalSettings.php to show detailed " .
 139                                 "debugging information. -->";
 140                 }
 141         }
 142
 143         /**
 144          * Get the text to display when reporting the error on the command line.
 145          * If $wgShowExceptionDetails is true, return a text message with a
 146          * backtrace to the error.
 147          *
 148          * @return string
 149          */
 150         function getText() {
 151                 global $wgShowExceptionDetails;
 152
 153                 if ( $wgShowExceptionDetails ) {
 154                         return $this->getMessage() .
 155                                 "\nBacktrace:\n" . MWExceptionHandler::formatRedactedTrace( $this ) . "\n";
 156                 } else {
 157                         return "Set \$wgShowExceptionDetails = true; " .
 158                                 "in LocalSettings.php to show detailed debugging information.\n";
 159                 }
 160         }
 161
 162         /**
 163          * Return the title of the page when reporting this error in a HTTP response.
 164          *
 165          * @return string
 166          */
 167         function getPageTitle() {
 168                 return $this->msg( 'internalerror', "Internal error" );
 169         }
 170
 171         /**
 172          * Get a random ID for this error.
 173          * This allows to link the exception to its corresponding log entry when
 174          * $wgShowExceptionDetails is set to false.
 175          *
 176          * @return string
 177          */
 178         function getLogId() {
 179                 if ( $this->logId === null ) {
 180                         $this->logId = wfRandomString( 8 );
 181                 }
 182                 return $this->logId;
 183         }
 184
 185         /**
 186          * Return the requested URL and point to file and line number from which the
 187          * exception occurred
 188          *
 189          * @return string
 190          */
 191         function getLogMessage() {
 192                 global $wgRequest;
 193
 194                 $id = $this->getLogId();
 195                 $file = $this->getFile();
 196                 $line = $this->getLine();
 197                 $message = $this->getMessage();
 198
 199                 if ( isset( $wgRequest ) && !$wgRequest instanceof FauxRequest ) {
 200                         $url = $wgRequest->getRequestURL();
 201                         if ( !$url ) {
 202                                 $url = '[no URL]';
 203                         }
 204                 } else {
 205                         $url = '[no req]';
 206                 }
 207
 208                 return "[$id] $url   Exception from line $line of $file: $message";
 209         }
 210
 211         /**
 212          * Output the exception report using HTML.
 213          */
 214         function reportHTML() {
 215                 global $wgOut;
 216                 if ( $this->useOutputPage() ) {
 217                         $wgOut->prepareErrorPage( $this->getPageTitle() );
 218
 219                         $hookResult = $this->runHooks( get_class( $this ) );
 220                         if ( $hookResult ) {
 221                                 $wgOut->addHTML( $hookResult );
 222                         } else {
 223                                 $wgOut->addHTML( $this->getHTML() );
 224                         }
 225
 226                         $wgOut->output();
 227                 } else {
 228                         header( "Content-Type: text/html; charset=utf-8" );
 229                         echo "<!doctype html>\n" .
 230                                 '<html><head>' .
 231                                 '<title>' . htmlspecialchars( $this->getPageTitle() ) . '</title>' .
 232                                 "</head><body>\n";
 233
 234                         $hookResult = $this->runHooks( get_class( $this ) . "Raw" );
 235                         if ( $hookResult ) {
 236                                 echo $hookResult;
 237                         } else {
 238                                 echo $this->getHTML();
 239                         }
 240
 241                         echo "</body></html>\n";
 242                 }
 243         }
 244
 245         /**
 246          * Output a report about the exception and takes care of formatting.
 247          * It will be either HTML or plain text based on isCommandLine().
 248          */
 249         function report() {
 250                 global $wgMimeType;
 251
 252                 $this->logException();
 253
 254                 if ( defined( 'MW_API' ) ) {
 255                         // Unhandled API exception, we can't be sure that format printer is alive
 256                         header( 'MediaWiki-API-Error: internal_api_error_' . get_class( $this ) );
 257                         wfHttpError( 500, 'Internal Server Error', $this->getText() );
 258                 } elseif ( self::isCommandLine() ) {
 259                         MWExceptionHandler::printError( $this->getText() );
 260                 } else {
 261                         header( "HTTP/1.1 500 MediaWiki exception" );
 262                         header( "Status: 500 MediaWiki exception", true );
 263                         header( "Content-Type: $wgMimeType; charset=utf-8", true );
 264
 265                         $this->reportHTML();
 266                 }
 267         }
 268
 269         /**
 270          * Log the error message to the exception log (if enabled)
 271          */
 272         function logException() {
 273                 global $wgLogExceptionBacktrace;
 274
 275                 $log = $this->getLogMessage();
 276                 if ( $log ) {
 277                         if ( $wgLogExceptionBacktrace ) {
 278                                 wfDebugLog( 'exception', $log . "\n" . MWExceptionHandler::formatRedactedTrace( $this ) . "\n" );
 279                         } else {
 280                                 wfDebugLog( 'exception', $log );
 281                         }
 282                 }
 283         }
 284
 285         /**
 286          * Check whether we are in command line mode or not to report the exception
 287          * in the correct format.
 288          *
 289          * @return bool
 290          */
 291         static function isCommandLine() {
 292                 return !empty( $GLOBALS['wgCommandLineMode'] );
 293         }
 294 }
 295
 296 /**
 297  * Exception class which takes an HTML error message, and does not
 298  * produce a backtrace. Replacement for OutputPage::fatalError().
 299  *
 300  * @since 1.7
 301  * @ingroup Exception
 302  */
 303 class FatalError extends MWException {
 304
 305         /**
 306          * @return string
 307          */
 308         function getHTML() {
 309                 return $this->getMessage();
 310         }
 311
 312         /**
 313          * @return string
 314          */
 315         function getText() {
 316                 return $this->getMessage();
 317         }
 318 }
 319
 320 /**
 321  * An error page which can definitely be safely rendered using the OutputPage.
 322  *
 323  * @since 1.7
 324  * @ingroup Exception
 325  */
 326 class ErrorPageError extends MWException {
 327         public $title, $msg, $params;
 328
 329         /**
 330          * Note: these arguments are keys into wfMessage(), not text!
 331          *
 332          * @param string|Message $title Message key (string) for page title, or a Message object
 333          * @param string|Message $msg Message key (string) for error text, or a Message object
 334          * @param array $params with parameters to wfMessage()
 335          */
 336         function __construct( $title, $msg, $params = null ) {
 337                 $this->title = $title;
 338                 $this->msg = $msg;
 339                 $this->params = $params;
 340
 341                 // Bug 44111: Messages in the log files should be in English and not
 342                 // customized by the local wiki. So get the default English version for
 343                 // passing to the parent constructor. Our overridden report() below
 344                 // makes sure that the page shown to the user is not forced to English.
 345                 if ( $msg instanceof Message ) {
 346                         $enMsg = clone( $msg );
 347                 } else {
 348                         $enMsg = wfMessage( $msg, $params );
 349                 }
 350                 $enMsg->inLanguage( 'en' )->useDatabase( false );
 351                 parent::__construct( $enMsg->text() );
 352         }
 353
 354         function report() {
 355                 global $wgOut;
 356
 357                 $wgOut->showErrorPage( $this->title, $this->msg, $this->params );
 358                 $wgOut->output();
 359         }
 360 }
 361
 362 /**
 363  * Show an error page on a badtitle.
 364  * Similar to ErrorPage, but emit a 400 HTTP error code to let mobile
 365  * browser it is not really a valid content.
 366  *
 367  * @since 1.19
 368  * @ingroup Exception
 369  */
 370 class BadTitleError extends ErrorPageError {
 371         /**
 372          * @param string|Message $msg A message key (default: 'badtitletext')
 373          * @param array $params parameter to wfMessage()
 374          */
 375         function __construct( $msg = 'badtitletext', $params = null ) {
 376                 parent::__construct( 'badtitle', $msg, $params );
 377         }
 378
 379         /**
 380          * Just like ErrorPageError::report() but additionally set
 381          * a 400 HTTP status code (bug 33646).
 382          */
 383         function report() {
 384                 global $wgOut;
 385
 386                 // bug 33646: a badtitle error page need to return an error code
 387                 // to let mobile browser now that it is not a normal page.
 388                 $wgOut->setStatusCode( 400 );
 389                 parent::report();
 390         }
 391
 392 }
 393
 394 /**
 395  * Show an error when a user tries to do something they do not have the necessary
 396  * permissions for.
 397  *
 398  * @since 1.18
 399  * @ingroup Exception
 400  */
 401 class PermissionsError extends ErrorPageError {
 402         public $permission, $errors;
 403
 404         function __construct( $permission, $errors = array() ) {
 405                 global $wgLang;
 406
 407                 $this->permission = $permission;
 408
 409                 if ( !count( $errors ) ) {
 410                         $groups = array_map(
 411                                 array( 'User', 'makeGroupLinkWiki' ),
 412                                 User::getGroupsWithPermission( $this->permission )
 413                         );
 414
 415                         if ( $groups ) {
 416                                 $errors[] = array( 'badaccess-groups', $wgLang->commaList( $groups ), count( $groups ) );
 417                         } else {
 418                                 $errors[] = array( 'badaccess-group0' );
 419                         }
 420                 }
 421
 422                 $this->errors = $errors;
 423         }
 424
 425         function report() {
 426                 global $wgOut;
 427
 428                 $wgOut->showPermissionsErrorPage( $this->errors, $this->permission );
 429                 $wgOut->output();
 430         }
 431 }
 432
 433 /**
 434  * Show an error when the wiki is locked/read-only and the user tries to do
 435  * something that requires write access.
 436  *
 437  * @since 1.18
 438  * @ingroup Exception
 439  */
 440 class ReadOnlyError extends ErrorPageError {
 441         public function __construct() {
 442                 parent::__construct(
 443                         'readonly',
 444                         'readonlytext',
 445                         wfReadOnlyReason()
 446                 );
 447         }
 448 }
 449
 450 /**
 451  * Show an error when the user hits a rate limit.
 452  *
 453  * @since 1.18
 454  * @ingroup Exception
 455  */
 456 class ThrottledError extends ErrorPageError {
 457         public function __construct() {
 458                 parent::__construct(
 459                         'actionthrottled',
 460                         'actionthrottledtext'
 461                 );
 462         }
 463
 464         public function report() {
 465                 global $wgOut;
 466                 $wgOut->setStatusCode( 503 );
 467                 parent::report();
 468         }
 469 }
 470
 471 /**
 472  * Show an error when the user tries to do something whilst blocked.
 473  *
 474  * @since 1.18
 475  * @ingroup Exception
 476  */
 477 class UserBlockedError extends ErrorPageError {
 478         public function __construct( Block $block ) {
 479                 // @todo FIXME: Implement a more proper way to get context here.
 480                 $params = $block->getPermissionsError( RequestContext::getMain() );
 481                 parent::__construct( 'blockedtitle', array_shift( $params ), $params );
 482         }
 483 }
 484
 485 /**
 486  * Shows a generic "user is not logged in" error page.
 487  *
 488  * This is essentially an ErrorPageError exception which by default uses the
 489  * 'exception-nologin' as a title and 'exception-nologin-text' for the message.
 490  * @see bug 37627
 491  * @since 1.20
 492  *
 493  * @par Example:
 494  * @code
 495  * if( $user->isAnon() ) {
 496  *      throw new UserNotLoggedIn();
 497  * }
 498  * @endcode
 499  *
 500  * Note the parameter order differs from ErrorPageError, this allows you to
 501  * simply specify a reason without overriding the default title.
 502  *
 503  * @par Example:
 504  * @code
 505  * if( $user->isAnon() ) {
 506  *      throw new UserNotLoggedIn( 'action-require-loggedin' );
 507  * }
 508  * @endcode
 509  *
 510  * @ingroup Exception
 511  */
 512 class UserNotLoggedIn extends ErrorPageError {
 513
 514         /**
 515          * @param $reasonMsg A message key containing the reason for the error.
 516          *        Optional, default: 'exception-nologin-text'
 517          * @param $titleMsg A message key to set the page title.
 518          *        Optional, default: 'exception-nologin'
 519          * @param $params Parameters to wfMessage().
 520          *        Optional, default: null
 521          */
 522         public function __construct(
 523                 $reasonMsg = 'exception-nologin-text',
 524                 $titleMsg = 'exception-nologin',
 525                 $params = null
 526         ) {
 527                 parent::__construct( $titleMsg, $reasonMsg, $params );
 528         }
 529 }
 530
 531 /**
 532  * Show an error that looks like an HTTP server error.
 533  * Replacement for wfHttpError().
 534  *
 535  * @since 1.19
 536  * @ingroup Exception
 537  */
 538 class HttpError extends MWException {
 539         private $httpCode, $header, $content;
 540
 541         /**
 542          * Constructor
 543          *
 544          * @param $httpCode Integer: HTTP status code to send to the client
 545          * @param string|Message $content content of the message
 546          * @param string|Message $header content of the header (\<title\> and \<h1\>)
 547          */
 548         public function __construct( $httpCode, $content, $header = null ) {
 549                 parent::__construct( $content );
 550                 $this->httpCode = (int)$httpCode;
 551                 $this->header = $header;
 552                 $this->content = $content;
 553         }
 554
 555         /**
 556          * Returns the HTTP status code supplied to the constructor.
 557          *
 558          * @return int
 559          */
 560         public function getStatusCode() {
 561                 return $this->httpCode;
 562         }
 563
 564         /**
 565          * Report the HTTP error.
 566          * Sends the appropriate HTTP status code and outputs an
 567          * HTML page with an error message.
 568          */
 569         public function report() {
 570                 $httpMessage = HttpStatus::getMessage( $this->httpCode );
 571
 572                 header( "Status: {$this->httpCode} {$httpMessage}", true, $this->httpCode );
 573                 header( 'Content-type: text/html; charset=utf-8' );
 574
 575                 print $this->getHTML();
 576         }
 577
 578         /**
 579          * Returns HTML for reporting the HTTP error.
 580          * This will be a minimal but complete HTML document.
 581          *
 582          * @return string HTML
 583          */
 584         public function getHTML() {
 585                 if ( $this->header === null ) {
 586                         $header = HttpStatus::getMessage( $this->httpCode );
 587                 } elseif ( $this->header instanceof Message ) {
 588                         $header = $this->header->escaped();
 589                 } else {
 590                         $header = htmlspecialchars( $this->header );
 591                 }
 592
 593                 if ( $this->content instanceof Message ) {
 594                         $content = $this->content->escaped();
 595                 } else {
 596                         $content = htmlspecialchars( $this->content );
 597                 }
 598
 599                 return "<!DOCTYPE html>\n" .
 600                         "<html><head><title>$header</title></head>\n" .
 601                         "<body><h1>$header</h1><p>$content</p></body></html>\n";
 602         }
 603 }
 604
 605 /**
 606  * Handler class for MWExceptions
 607  * @ingroup Exception
 608  */
 609 class MWExceptionHandler {
 610         /**
 611          * Install an exception handler for MediaWiki exception types.
 612          */
 613         public static function installHandler() {
 614                 set_exception_handler( array( 'MWExceptionHandler', 'handle' ) );
 615         }
 616
 617         /**
 618          * Report an exception to the user
 619          */
 620         protected static function report( Exception $e ) {
 621                 global $wgShowExceptionDetails;
 622
 623                 $cmdLine = MWException::isCommandLine();
 624
 625                 if ( $e instanceof MWException ) {
 626                         try {
 627                                 // Try and show the exception prettily, with the normal skin infrastructure
 628                                 $e->report();
 629                         } catch ( Exception $e2 ) {
 630                                 // Exception occurred from within exception handler
 631                                 // Show a simpler error message for the original exception,
 632                                 // don't try to invoke report()
 633                                 $message = "MediaWiki internal error.\n\n";
 634
 635                                 if ( $wgShowExceptionDetails ) {
 636                                         $message .= 'Original exception: ' . self::formatRedactedTrace( $e ) . "\n\n" .
 637                                                 'Exception caught inside exception handler: ' . $e2->__toString();
 638                                 } else {
 639                                         $message .= "Exception caught inside exception handler.\n\n" .
 640                                                 "Set \$wgShowExceptionDetails = true; at the bottom of LocalSettings.php " .
 641                                                 "to show detailed debugging information.";
 642                                 }
 643
 644                                 $message .= "\n";
 645
 646                                 if ( $cmdLine ) {
 647                                         self::printError( $message );
 648                                 } else {
 649                                         echo nl2br( htmlspecialchars( $message ) ) . "\n";
 650                                 }
 651                         }
 652                 } else {
 653                         $message = "Unexpected non-MediaWiki exception encountered, of type \"" . get_class( $e ) . "\"";
 654
 655                         if ( $wgShowExceptionDetails ) {
 656                                 $message .= "\nexception '" . get_class( $e ) . "' in " . $e->getFile() . ":" . $e->getLine() . "\nStack trace:\n" . self::formatRedactedTrace( $e ) . "\n";
 657                         }
 658
 659                         if ( $cmdLine ) {
 660                                 self::printError( $message );
 661                         } else {
 662                                 echo nl2br( htmlspecialchars( $message ) ) . "\n";
 663                         }
 664                 }
 665         }
 666
 667         /**
 668          * Print a message, if possible to STDERR.
 669          * Use this in command line mode only (see isCommandLine)
 670          *
 671          * @param string $message Failure text
 672          */
 673         public static function printError( $message ) {
 674                 # NOTE: STDERR may not be available, especially if php-cgi is used from the command line (bug #15602).
 675                 #      Try to produce meaningful output anyway. Using echo may corrupt output to STDOUT though.
 676                 if ( defined( 'STDERR' ) ) {
 677                         fwrite( STDERR, $message );
 678                 } else {
 679                         echo $message;
 680                 }
 681         }
 682
 683         /**
 684          * Exception handler which simulates the appropriate catch() handling:
 685          *
 686          *   try {
 687          *       ...
 688          *   } catch ( MWException $e ) {
 689          *       $e->report();
 690          *   } catch ( Exception $e ) {
 691          *       echo $e->__toString();
 692          *   }
 693          */
 694         public static function handle( $e ) {
 695                 global $wgFullyInitialised;
 696
 697                 self::report( $e );
 698
 699                 // Final cleanup
 700                 if ( $wgFullyInitialised ) {
 701                         try {
 702                                 // uses $wgRequest, hence the $wgFullyInitialised condition
 703                                 wfLogProfilingData();
 704                         } catch ( Exception $e ) {
 705                         }
 706                 }
 707
 708                 // Exit value should be nonzero for the benefit of shell jobs
 709                 exit( 1 );
 710         }
 711
 712         /**
 713          * Get the stack trace from the exception as a string, redacting certain function arguments in the process
 714          * @param Exception $e The exception
 715          * @return string The stack trace as a string
 716          */
 717         public static function formatRedactedTrace( Exception $e ) {
 718                 global $wgRedactedFunctionArguments;
 719                 $finalExceptionText = '';
 720
 721                 foreach ( $e->getTrace() as $i => $call ) {
 722                         $checkFor = array();
 723                         if ( isset( $call['class'] ) ) {
 724                                 $checkFor[] = $call['class'] . '::' . $call['function'];
 725                                 foreach ( class_parents( $call['class'] ) as $parent ) {
 726                                         $checkFor[] = $parent . '::' . $call['function'];
 727                                 }
 728                         } else {
 729                                 $checkFor[] = $call['function'];
 730                         }
 731
 732                         foreach ( $checkFor as $check ) {
 733                                 if ( isset( $wgRedactedFunctionArguments[$check] ) ) {
 734                                         foreach ( (array)$wgRedactedFunctionArguments[$check] as $argNo ) {
 735                                                 $call['args'][$argNo] = 'REDACTED';
 736                                         }
 737                                 }
 738                         }
 739
 740                         $finalExceptionText .= "#{$i} {$call['file']}({$call['line']}): ";
 741                         if ( isset( $call['class'] ) ) {
 742                                 $finalExceptionText .= $call['class'] . $call['type'] . $call['function'];
 743                         } else {
 744                                 $finalExceptionText .= $call['function'];
 745                         }
 746                         $args = array();
 747                         foreach ( $call['args'] as $arg ) {
 748                                 if ( is_object( $arg ) ) {
 749                                         $args[] = 'Object(' . get_class( $arg ) . ')';
 750                                 } elseif( is_array( $arg ) ) {
 751                                         $args[] = 'Array';
 752                                 } else {
 753                                         $args[] = var_export( $arg, true );
 754                                 }
 755                         }
 756                         $finalExceptionText .=  '(' . implode( ', ', $args ) . ")\n";
 757                 }
 758                 return $finalExceptionText . '#' . ( $i + 1 ) . ' {main}';
 759         }
 760 }