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Date: Sun, 29 Nov 2020 23:19:31 +0100
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Subject: Detect if function is disabled from c ext
From: vorismi3@fel.cvut.cz (=?UTF-8?Q?Michael_Vo=C5=99=C3=AD=C5=A1ek_-_=C4=8CVUT_FEL?=)

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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. 

With kind regards / Mit freundlichen Grüßen / S přátelským pozdravem,

Michael Voříšek
ČVUT FEL
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