Detect if function is disabled from c ext

On Sun, Nov 29, 2020 at 11:20 PM Michael Voříšek - ČVUT FEL <
vorismi3@fel.cvut.cz> wrote:

How can a php function can be checked from extension if that function is
disabled or not?

In php7.x, I used:

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdbool.h>
#include "php.h"

bool is_php_function_disabled(const char *func_name) {
zend_internal_function *func;
if ((func = zend_hash_str_find_ptr(CG(function_table), func_name,
strlen(func_name)))) {
if (func->handler == ZEND_FN(display_disabled_function)) {
return true;
}
}

return false;
}

But it does not work for php8:

In file included from /usr/local/include/php/main/php.h:35,
from .../ext/libs.c:6:
.../ext/libs.c: In function 'is_php_function_disabled':
/usr/local/include/php/Zend/zend_API.h:68:23: error:
'zif_display_disabled_function' undeclared (first use in this function)
68 | #define ZEND_FN(name) zif_##name
| ^~~~
.../ext/libs.c:237:30: note: in expansion of macro 'ZEND_FN'
237 | if (func->handler == ZEND_FN(display_disabled_function)) {

Thanks for help in advance.

In PHP 8, the question is ill-posed. A disabled function is
indistinguishable from a function that does not exist. (You can of course
check the value of the ini setting, but there should be no good reason to
do so.)

Nikita