Retrieving response headers from http streams

[HeenaBansal20]

Description

HI ,
I apologize for raising a bug issue though It is a question..
Since I don't find the Issue type:Question , I need to submit as a Bug.
May be you can add one more isse type as questions/general category to handle these kind of requests.

Anyway :
I am looking the implementation of the function http_get_last_response_headers
and would like to know what kind of globals this BG() stores.

PHP Version

PHP 8.4

Operating System

Ubuntu 20.04

[Girgias]

The BG() macros refers to the following globals.

php-src/ext/standard/basic_functions.h

Lines 54 to 110 in b06f2bc

	typedef struct _php_basic_globals {
	HashTable *user_shutdown_function_names;
	HashTable putenv_ht;
	zend_string *strtok_string;
	zend_string *ctype_string; /* current LC_CTYPE locale (or NULL for 'C') */
	bool locale_changed; /* locale was changed and has to be restored */
	char *strtok_last;
	char strtok_table[256];
	size_t strtok_len;
	zend_fcall_info user_compare_fci;
	zend_fcall_info_cache user_compare_fci_cache;
	zend_llist *user_tick_functions;
	zval active_ini_file_section;
	/* http_fopen_wrapper.c */
	zval last_http_headers;
	/* pageinfo.c */
	zend_long page_uid;
	zend_long page_gid;
	zend_long page_inode;
	time_t page_mtime;
	/* filestat.c && main/streams/streams.c */
	zend_string *CurrentStatFile, *CurrentLStatFile;
	php_stream_statbuf ssb, lssb;
	/* syslog.c */
	char *syslog_device;
	/* var.c */
	unsigned serialize_lock; /* whether to use the locally supplied var_hash instead (__sleep/__wakeup) */
	struct {
	struct php_serialize_data *data;
	unsigned level;
	} serialize;
	struct {
	struct php_unserialize_data *data;
	unsigned level;
	} unserialize;
	/* url_scanner_ex.re */
	url_adapt_state_ex_t url_adapt_session_ex;
	HashTable url_adapt_session_hosts_ht;
	url_adapt_state_ex_t url_adapt_output_ex;
	HashTable url_adapt_output_hosts_ht;
	HashTable *user_filter_map;
	/* file.c */
	#if defined(_REENTRANT)
	mbstate_t mblen_state;
	#endif
	int umask;
	zend_long unserialize_max_depth;
	} php_basic_globals;

[HeenaBansal20]

@Girgias, Thanks for prompt reply, However I would like to know how this val gets populated.
I cannot see any much reference for this zval literal in php src code.
I am basically looking how php captures the response headers from http stream.
Thanks