7.1 extension writing, output parameter remains unchanged

[Jan Vávra <vavra@xxxxxx>]

Hello,
 I'm porting our extension from php5.6 to php7.1 x64 Windows, Visual 
Studio 2015.
I'd like to write an extension function that has one input / output 
parameter type of long. But the parameter value changed in extension is 
not changed in php. What I'm doing wrong?
The php code is:

$a = 3;
$r = hello_square($a);
var_export($a); echo "\n"; //value of $a still remains 3, should be 9.

The c code is:

PHP_FUNCTION(hello_square)
{
  long a = 0;
  zval *b;

  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &b) == 
FAILURE) {
    return;
  }

  a = Z_LVAL_P(b);
  ZVAL_LONG(b, a*a);

  RETURN_BOOL(1);
}

----

I also implemented hello_square this way
PHP_FUNCTION(hello_square)
{
  zend_long b;

  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &b) == 
FAILURE) {
    return;
  }

  b = b * b;
  RETURN_BOOL(1);
}

And the value of $a remains unchanged.

Jan.

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