Errors

Their always is possibility that something goes wrong and some of the listeners crash whole system. To avoid that situation EventDispatcher execute all listeners in try/catch block and store all information about exceptions.
That solution allow to continue system work event if some listeners throw exception and if that necessary check EventDispatcher error status and make some special actions when listener throw exception.
To handle that feature EventDispatcher provide three methods:

• getErrors - return all listeners exception objects as array
• hasErrors - return true if some of listeners throw exception
• clearErrors - clear error list and set has errors to false

Each exception log listener execution with error status

Error list

Example of listener exception list:

array (
  0 => 
  array (
    'message' => 'Test error',
    'line' => 532,
    'file' => '/projects/class-event/src/Test/EventDispatcherTest.php',
    'trace' => '#0 [internal function]: ClassEvent\\Test\\EventDispatcherTest::triggerError(Array, Object(ClassEvent\\Event\\BaseEvent))
#1 /home/chajr/projects/class-event/src/Event/Base/EventDispatcher.php(203): call_user_func_array(\'ClassEvent\\\\Test...\', Array)
#2 /home/chajr/projects/class-event/src/Event/Base/EventDispatcher.php(154): ClassEvent\\Event\\Base\\EventDispatcher->_callFunction(\'ClassEvent\\\\Test...\', Array, Object(ClassEvent\\Event\\BaseEvent))
#3 /home/chajr/projects/class-event/src/Test/EventDispatcherTest.php(234): ClassEvent\\Event\\Base\\EventDispatcher->triggerEvent(\'test_event\')
#4 [internal function]: ClassEvent\\Test\\EventDispatcherTest->testTriggerEventWithError()
#5 phar:///usr/local/bin/phpunit/phpunit/Framework/TestCase.php(846): ReflectionMethod->invokeArgs(Object(ClassEvent\\Test\\EventDispatcherTest), Array)
#6 phar:///usr/local/bin/phpunit/phpunit/Framework/TestCase.php(731): PHPUnit_Framework_TestCase->runTest()
#7 phar:///usr/local/bin/phpunit/phpunit/Framework/TestResult.php(609): PHPUnit_Framework_TestCase->runBare()
#8 phar:///usr/local/bin/phpunit/phpunit/Framework/TestCase.php(687): PHPUnit_Framework_TestResult->run(Object(ClassEvent\\Test\\EventDispatcherTest))
#9 phar:///usr/local/bin/phpunit/phpunit/Framework/TestSuite.php(716): PHPUnit_Framework_TestCase->run(Object(PHPUnit_Framework_TestResult))
#10 phar:///usr/local/bin/phpunit/phpunit/Framework/TestSuite.php(716): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult))
#11 phar:///usr/local/bin/phpunit/phpunit/Framework/TestSuite.php(716): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult))
#12 phar:///usr/local/bin/phpunit/phpunit/TextUI/TestRunner.php(388): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult))
#13 phar:///usr/local/bin/phpunit/phpunit/TextUI/Command.php(151): PHPUnit_TextUI_TestRunner->doRun(Object(PHPUnit_Framework_TestSuite), Array)
#14 phar:///usr/local/bin/phpunit/phpunit/TextUI/Command.php(103): PHPUnit_TextUI_Command->run(Array, true)
#15 /usr/local/bin/phpunit(620): PHPUnit_TextUI_Command::main()
#16 {main}',
  ),
)