error_get_last() returns null after set_error_handler(); php 7.0

问题

The next code:

$a["x"];//should trigger notice
var_dump(error_get_last());//return the error array

runs perfectly and returns an error array. but when I use set_error_handler it returns null

function _do_nothing(){}
set_error_handler('_do_nothing');

$a["x"];//should trigger notice
var_dump(error_get_last());//return null

This code works perfectly on PHP5.4 I had changed 3 month ago to PHP7 and since then I am getting nulls in error_get_last() I am using a shutdown function to check if an error has occured and if so to send it to the developer.

1. Is there a way to make this code run in PHP7? and make error_get_last() works with set_error_handler()?
2. Any other ideas for workaround? and make a shutdown function get the last error? I am using CodeIgniter, and prefer not to hack their internal code.

回答1:

This is normal behavior because in your example the error is already handled by the _do_nothing() function, so the error_get_last() returns null

if you remove set_error_handler('_do_nothing') the error won't be handled anymore and you will get the last error again

function _do_nothing(){}
//set_error_handler('_do_nothing');

$a["x"];//should trigger notice
var_dump(error_get_last());//return array() "Undefined variable: a"

This behavior is the same in PHP5 as in PHP7

来源：https://stackoverflow.com/questions/40915174/error-get-last-returns-null-after-set-error-handler-php-7-0