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Date: Sun, 29 Nov 2020 23:28:28 +0100
Message-ID: <CAF+90c8bx=zUWE90yQ2HECLp50h=iHL_D9XfrsSmVTHx6xJ4WA@mail.gmail.com>
To: =?UTF-8?B?TWljaGFlbCBWb8WZw63FoWVrIC0gxIxWVVQgRkVM?= <vorismi3@fel.cvut.cz>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Detect if function is disabled from c ext
From: nikita.ppv@gmail.com (Nikita Popov)

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On Sun, Nov 29, 2020 at 11:20 PM Michael Vo=C5=99=C3=AD=C5=A1ek - =C4=8CVUT=
 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 =3D zend_hash_str_find_ptr(CG(function_table), func_name,
> strlen(func_name)))) {
> if (func->handler =3D=3D 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 =3D=3D 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

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