[PHP-DEV] PHP Extension Memory Problems

[Bruce Bailey]

I have two problems with a PHP extension that I wrote that creates PHP 
arrays.

1) If I call my extension function that creates PHP arrays and returns them, 
unless I either ‘unset’ or assign it to the empty string the process acts 
like there is a memory leak.

PHP:

For ($I = 0; $I < $count; $I++)
{
        $retCd = createArray(&$arr);
        unset($arr);  // for some reason this is necessary.
}
C Extension in createArray function:

zval *Arr = 0;

if (zend_parse_parameters(argc TSRMLS_CC, "z", &Arr) == FAILURE)
  return ;
if (!PZVAL_IS_REF(Arr))
{
  zend_error(E_ERROR, "The Arr parameter must be passed by reference");
  RETURN_NULL();
}
array_init(Arr);

if (add_assoc_string(Arr, (char *) szFieldName, (char *) szValue, 1) == 
FAILURE) {
. . .
}

What can I do in my extension to unset or clear the variable so that it 
doesn’t have to be done in the PHP script?

2) For some reason, after the PHP script finishes, the amount of memory as 
reported by Linux ‘top’ does not go back down to it’s initial level.  I 
notice this especially if I create large PHP arrays.  This is very likely to 
be related to the previous problem.

Thanks in advance,

Bruce

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