Description:
------------
bad parsing of parameters

Reproduce code:
---------------
#! /usr/bin/php
<?php

// bug.php
exec( './hola.sh' , $output1 = array() );

print_r($output1);

exec( './hola.sh' , $output2 );

print_r($output2);

?>

#! /bin/sh

echo hola


Expected result:
----------------
both must be return 
Array
(
    [0] => hola
)


Actual result:
--------------
Array
(
)
Array
(
    [0] => hola
)