The flow and principle of PHP exception mechanism

What is the principle of PHP's exception mechanism? What is the last zend_handle_exception in PHP for each executable op array? Let's start with a question.

For a bit of code, onerror clearly executed, but Onexception did not execute, why?

 
 

  
  

  
 
  
  

  
function onError ($errCode,  $errMesg,  $errFile,  $ Errline) {
  
  

  
Echo　　　   "Error occurred\n"; 
  
  

  
Throw　   New  Exception ($errMesg); 
  
  

  
}
  
  

  
function onexception ($e) {
  
  

  
Echo　   $e->getmessage (); 
  
  

  
}
  
  

  
Set_error_handler ("OnError"); 
  
  

  
Set_exception_handler ("onexception"); 
  
  

  
/* I will never name a file in my name, so this file does not exist */　 
  
  

  
require ("laruence.php");
 
 

Operation Result:

 
  
  

  
   
   
Error occurred 
  
   
   
PHP Fatal Error:main (): Failed opening required ' laruence.php
 
  
  

First, we need to know that require throws two errors before and after it contains a problem that cannot be found:

1. WARNING: Thrown when PHP tries to open the file.

2. E_compile_error: The function that opened the file from PHP fails to be thrown after the failure.

And we know that Set_error_handler is not able to capture e_compile_error errors. So, in OnError, you can only catch the first warning error, and the exception thrown in OnError, why is it not captured by default Exception_handler? This is about PHP.

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