[PHP-BUG] Bug #65812 [NEW]: Func returns NULL if last stmt is 'Exception' or 'die' inside unreachable else

[florian dot mueller at hostpoint dot ch]

From:             florian dot mueller at hostpoint dot ch
Operating system: freebsd 9.2
PHP version:      5.5.4
Package:          CGI/CLI related
Bug Type:         Bug
Bug description:Func returns NULL if last stmt is 'Exception' or 'die' inside 
unreachable else

Description:
------------
Important: The problem occurs only with php-cgi binary and not with php
binary.

The problem is, that the following snipped returns NULL instead of true.
My guess is, that it has to do with a) if($variable) and b) the fact
that "throw new Exception" is the last expression before return.

function testMinimal(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  return true;
}

A attached a test script with several cases. 

For example this one returns NULL as well:

function testMinimalDie(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        die();
  }

  return true;
}

whereas those two work:

function testMinimalNoVar(){
  if(true){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  return true;
}

function testMinimalHack(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  $someUnrelatedVariable=1;

  return true;
}

Test script:
---------------
<?php

echo "testMinimal ";
var_dump(testMinimal());
echo "testMinimalOk ";
var_dump(testMinimalOk());
echo "testMinimalNoEx ";
var_dump(testMinimalNoEx());
echo "testMinimalDie ";
var_dump(testMinimalDie());
echo "testMinimalDivZero ";
var_dump(testMinimalDivZero());
echo "testMinimalNoVar ";
var_dump(testMinimalNoVar());
echo "testMinimalEEE ";
var_dump(testMinimalEEE());
echo "testMinimalEE ";
var_dump(testMinimalEE());
echo "testMinimalReturnFalse ";
var_dump(testMinimalReturnFalse());
echo "testMinimalHack ";
var_dump(testMinimalHack());

function testMinimal(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  return true;
}

function testMinimalHack(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  $someUnrelatedVariable=1;

  return true;
}

function testMinimalEEE(){
  $foo = true;

  if($foo===true){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  return true;
}

function testMinimalEE(){
  $foo = true;

  if($foo==true){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  return true;
}


function testMinimalNoVar(){
  if(true){
        echo '';
  } else {
        throw new Exception('foo');     
  }

  return true;
}

function testMinimalReturnFalse(){
  if(true){
        echo '';
  } else {
        return false;   
  }

  return true;
}

function testMinimalNoEx(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        echo 'gugus';   
  }

  return true;
}

function testMinimalDie(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        die();
  }

  return true;
}

function testMinimalDivZero(){
  $foo = true;

  if($foo){
        echo '';
  } else {
        0/0;
  }

  return true;
}

function testMinimalOk(){
  $foo = true;

  if($foo){
        echo '';
  }

  return true;
}
?>


Expected result:
----------------
testMinimal bool(true)
testMinimalOk bool(true)
testMinimalNoEx bool(true)
testMinimalDie bool(true)
testMinimalDivZero bool(true)
testMinimalNoVar bool(true)
testMinimalEEE bool(true)
testMinimalEE bool(true)
testMinimalReturnFalse bool(true)
testMinimalHack bool(true)


Actual result:
--------------
testMinimal NULL
testMinimalOk bool(true)
testMinimalNoEx bool(true)
testMinimalDie NULL
testMinimalDivZero bool(true)
testMinimalNoVar bool(true)
testMinimalEEE NULL
testMinimalEE NULL
testMinimalReturnFalse bool(true)
testMinimalHack bool(true)


-- 
Edit bug report at https://bugs.php.net/bug.php?id=65812&edit=1
-- 
Try a snapshot (PHP 5.4):   
https://bugs.php.net/fix.php?id=65812&r=trysnapshot54
Try a snapshot (PHP 5.5):   
https://bugs.php.net/fix.php?id=65812&r=trysnapshot55
Try a snapshot (trunk):     
https://bugs.php.net/fix.php?id=65812&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=65812&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=65812&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=65812&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=65812&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=65812&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=65812&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=65812&r=notwrong
Not enough info:            
https://bugs.php.net/fix.php?id=65812&r=notenoughinfo
Submitted twice:            
https://bugs.php.net/fix.php?id=65812&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=65812&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=65812&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=65812&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=65812&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=65812&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=65812&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=65812&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=65812&r=mysqlcfg