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Bug #14687 Ignoring @'s after set_error_handler() is used
Submitted: 2001-12-24 10:16 UTC Modified: 2001-12-31 05:47 UTC
From: matthew_dean at hotmail dot com Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.0.6 OS: Redhat 7.0, Solaris 7
Private report: No CVE-ID: None
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 [2001-12-24 10:16 UTC] matthew_dean at hotmail dot com 
<?php
  function myErrorHandler($errorNum) {
    echo "$errorNum\n";
  }
  set_error_handler("myErrorHandler");
  #error_reporting (E_ALL);#doesn't change the bug behaviour
  @$j=$i;
?>

This echos: 
8


Yet according to: http://www.php.net/manual/en/function.set-error-handler.php

"Of particular note is that this value will be 0 if the statement that caused the error was prepended by the @ error-control operator. "



I've tried this on 4.0.4pl1 and 4.0.6
The changelog for 4.1.0 doesn't mention a fix.

The @ works fine for lines executed before set_error_handler().



Here's one of the configure lines, though (to me) it doesn't seem likely to be a compiley issue...

'./configure' '--with-db' '--enable-dba' '--with-gdbm' '--with-xml' '--with-oci8=/usr/local/oracle/' '--with-apxs=/usr/local/apache-1.3.14/bin/apxs' '--with-mysql=/usr/local/mysql' '--with-gd' '--with-sablot'

Thanks!

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 [2001-12-28 09:09 UTC] zeev@php.net 
It's the programmer's responsibility to honor error_reporting in the error handler.  The error handler will be called even if the error that occured is not inside the error_reporting mask - to allow you to conduct logging, recovery, etc.

You can easily honor it by using the return value of error_reporting(), and compare it (using &) with the error level that you got.
 [2001-12-31 05:47 UTC] matthew_dean at hotmail dot com 
Ah, ok, thanks. - I understand now. It was only the meaning of the @ operator I didn't follow.

I'd misinterpreted the docs.

I thought that prepending an @ set the errorNum to 0 ( either that or it suppressed the call to the error handler), when in fact it sets the global error level to 0 for the @-ed expression.

I thought the @ was: 'Supress errors'

Actually it's: 'Trigger an error as normal, but with the error level temporarily set to 0'

Thanks,
Matt
 
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