Description:
------------
 If you have a divide by zero constant, the initial syntax check parsing catches it as an error even if the code is never executed.
 A consequence of this is that error_reporting() and set_ini('display_errors'..) are ignored since the error is triggeed before the php code is exectued.

 This in itself is not neccessarily a bug since you shouldn't have a constant divide by zero, but the error report doesn't tell you the file it came from (says unknown at line 0): this can be very frustrating if you have a large number of include() files).
  Setting display_error=0 in the .ini file is also ignored if error_reporting is on


Reproduce code:
---------------
#!/usr/local/bin/php
<?
if (0) $x = 5 / 0;
?>

Expected result:
----------------
File runs

or, if (error_reporting | E_WARNING) && display_errors

PHP Warning:  Division by zero in test.php on line 3

Actual result:
--------------
if (error_reporting | E_WARNING) and display_errors==0
  [stderr:]
PHP Warning:  Division by zero in Unknown on line 0

if (error_reporting | E_WARNING) and display_errors==1
  [stderr:]
PHP Warning:  Division by zero in Unknown on line 0
  [stdout:]
<br />
<b>Warning</b>:  Division by zero in <b>Unknown</b> on line <b>0</b><br />
  [ yes, the error is reported twice ]


if (error_reporting == 0)
  [ No output ]