Extensions: parameters as references

[Yasir Malik <ymalik@xxxxxxxxxxxxxx>]

I am creating a PHP extension.  In my function, I want the parameter to be 
a reference.  The extension function works fine only if the variable 
passed is initialized.  For example, here is the extension function:
ZEND_FUNCTION(first_module)
{
   zval *parameter;

   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,
                             "z", &parameter) == FAILURE)
       return;

   ZVAL_LONG(parameter, 78);
}

When I call this as
<?php
dl("test.so");
$a = 4;
first_module($a);
print "$a\n";
?>

it works fine, but when I call it as:
<?php
dl("test.so");
first_module($a);
print "$a\n";
?>

nothing is outputted.  I looked at the source code for various extensions, 
and I noticed that they called the deconstructor zval_dtor().  I tried 
this, but it still did not work:
ZEND_FUNCTION(first_module)
{
   zval *parameter;

   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,
                             "z", &parameter) == FAILURE)
       return;

   zval_dtor(parameter);
   ZVAL_LONG(parameter, 78);
}

Thanks,
Yasir

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