<?php $error_handler = function($level,$message) { echo "Main error handler: $message \n"; // ... // imagine somewhere inside the error handler a log writer is called // which uses it's own error handler for failing file operations // which is what Zend\Log\Writer\Stream does with Zend\StdLib\ErrorHandler $nested_error_handler = function ($level,$message) { echo "Nested error handler: $message \n"; }; set_error_handler($nested_error_handler,E_WARNING); //strpos(); //Produce a warning inside the log writer restore_error_handler(); //restore the error handler to $eh after log written // ... return true; }; set_error_handler($error_handler); trigger_error('Some message',E_USER_NOTICE); /* expected output: Main error handler: Some message */ trigger_error('Some other message',E_USER_NOTICE); /* expected output: Main error handler: Some other message */
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