Description:
------------
I'm running a script which tries to run something else in the 
background, like such:

This code is inside a script called waiting.php

<?php
popen("php -f stall.php  > tmp &','r');
?>

and stall.php is:
<?php
$V=array_combine(array('a','b','c'),array(1,2,3));

foreach ($V as $k=>$v) {
	echo $V[$k].chr(10);
}
?>

It works fine... until I use the function "array_combine" in the 
script stall.php

For some reason, even though this function works fine both in the 
console and through apache, it crashes my code whenever I try to run 
it in the background. Any thoughts on why this happens?







Reproduce code:
---------------
This code is inside a script called waiting.php

<?php
popen("php -f stall.php  > tmp &','r');
?>

and stall.php is:
<?php
$V=array_combine(array('a','b','c'),array(1,2,3));

foreach ($V as $k=>$v) {
	echo $V[$k].chr(10);
}
?>



Expected result:
----------------
tmp:

1
2
3

Actual result:
--------------
tmp is empty