introduce the file b.php into the file a.php and execute a function c in b.php in a.php. At this point c throws an exception that cannot be caught in a. Environment: nginx,php-fpm. 
 nginx Direct 502 
 excuse me. Post the code and error below: 
 code in a.php 
 
nginx

bpdob.phpcatchb.php:
 
 
 in addition, php-fpm does not have any error logs. 
