Re: Detect if function is disabled from c ext
| From: | Nikita Popov | Date: | Sun, 29 Nov 2020 22:28:28 +0000 |
| Subject: | Re: Detect if function is disabled from c ext | ||
| References: | 1 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-112316@lists.php.net to get a copy of this message | ||
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