Hi Jan
2017-07-19 12:17 GMT+02:00 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.
What you should do is to make the parameter sent to hello_square() a
reference, this is done by the following (keep in mind this uses the
new and fast parameter parsing API, but it is still do-able with the
old zend_parse_parameters()):
https://gist.github.com/KalleZ/69f9ca1895bcac945e110b7777104203
Take a look at the README.PARAMETER_PARSING_API in the root of
php-src, this includes all possible values that
zend_parse_parameters() can accept
--
regards,
Kalle Sommer Nielsen
kalle@xxxxxxx
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