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<?php class Logger { public function log() { set_error_handler('count'); echo __METHOD__ . "\n"; restore_error_handler(); } } function first_error_handler() { echo __FUNCTION__ . "\n"; } class ErrorHandler { public function handleError() { echo __METHOD__ . "\n"; (new Logger())->log(); } } set_error_handler('first_error_handler'); set_error_handler([new ErrorHandler(), 'handleError']); trigger_error('AN ERROR', E_USER_DEPRECATED); var_dump(set_error_handler(null));
Output for 7.3.16 - 7.3.33, 7.4.4 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
ErrorHandler::handleError Logger::log array(2) { [0]=> object(ErrorHandler)#1 (0) { } [1]=> string(11) "handleError" }
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.12, 7.4.0
ErrorHandler::handleError Logger::log string(19) "first_error_handler"

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