Description:
------------
When you write a custom error handler to be used with set_error_handler(), the error_get_last() function is no longer usable (always returns NULL) unless you make your handler return FALSE (the internal variables required are filled by the builtin error handler).

There should be a mechanism to feed the required error info from custom error handler so error_get_last() can be made available.

Test script:
---------------
<?php
function custom_error_handler($errno, $errstr, $errfile, $errline){
    $ignore = ($errno & error_reporting()) == 0;
    if(!$ignore){
        echo "[Error happened: $errstr]\n";
    }
    return TRUE;
}
set_error_handler('custom_error_handler');

@fopen('xxx');
var_dump( error_get_last() ); // NULL

Expected result:
----------------
array(4) {
  ["type"]=>
  int(2)
  ["message"]=>
  string(46) "fopen() expects at least 2 parameters, 1 given"
  ["file"]=>
  string(15) "C:\tmp\test.php"
  ["line"]=>
  int(11)
}

Actual result:
--------------
NULL