1，创建一个新的扩展
./ext_skel --extname=globals
2，常用全局宏
A) SG() SAPI Globals (main/SAPI.h)
typedef struct {
const char *request_method;
char *query_string;
char *post_data, *raw_post_data;
char *cookie_data;
long content_length;
uint post_data_length, raw_post_data_length;
char *path_translated;
char *request_uri;
const char *content_type;
zend_bool headers_only;
zend_bool no_headers;
zend_bool headers_read;
sapi_post_entry *post_entry;
char *content_type_dup;
/* for HTTP authentication */
char *auth_user;
char *auth_password;
char *auth_digest;
/* this is necessary for the CGI SAPI module */
char *argv0;
char *current_user;
int current_user_length;
/* this is necessary for CLI module */
int argc;
char **argv;
int proto_num;
} sapi_request_info;
typedef struct _sapi_globals_struct {
void *server_context;
sapi_request_info request_info;
sapi_headers_struct sapi_headers;
int read_post_bytes;
unsigned char headers_sent;
struct stat global_stat;
char *default_mimetype;
char *default_charset;
HashTable *rfc1867_uploaded_files;
long post_max_size;
int options;
zend_bool sapi_started;
double global_request_time;
HashTable known_post_content_types;
zval *callback_func;
zend_fcall_info_cache fci_cache;
zend_bool callback_run;
} sapi_globals_struct;
#ifdef ZTS
# define SG(v) TSRMG(sapi_globals_id, sapi_globals_struct *, v)
SAPI_API extern int sapi_globals_id;
#else
# define SG(v) (sapi_globals.v)
extern SAPI_API sapi_globals_struct sapi_globals;
//访问SG变量
#include "main/SAPI.h"
php_printf("default_mimetype : %s\n", SG(default_mimetype));
B) EG() 这个宏可以用来访问符号表，函数，资源信息和常量。 (zend/zend_globals_macros.h)
struct _zend_executor_globals {
zval **return_value_ptr_ptr;
zval uninitialized_zval;
zval *uninitialized_zval_ptr;
zval error_zval;
zval *error_zval_ptr;
/* symbol table cache */
HashTable *symtable_cache[SYMTABLE_CACHE_SIZE];
HashTable **symtable_cache_limit;
HashTable **symtable_cache_ptr;
zend_op **opline_ptr;
HashTable *active_symbol_table;
HashTable symbol_table; /* main symbol table */
HashTable included_files; /* files already included */
JMP_BUF *bailout;
int error_reporting;
int orig_error_reporting;
int exit_status;
zend_op_array *active_op_array;
HashTable *function_table; /* function symbol table */
HashTable *class_table; /* class table */
HashTable *zend_constants; /* constants table */
zend_class_entry *scope;
zend_class_entry *called_scope; /* Scope of the calling class */
zval *This;
long precision;
int ticks_count;
zend_bool in_execution;
HashTable *in_autoload;
zend_function *autoload_func;
zend_bool full_tables_cleanup;
/* for extended information support */
zend_bool no_extensions;
#ifdef ZEND_WIN32
zend_bool timed_out;
OSVERSIONINFOEX windows_version_info;
#endif
HashTable regular_list;
HashTable persistent_list;
zend_vm_stack argument_stack;
int user_error_handler_error_reporting;
zval *user_error_handler;
zval *user_exception_handler;
zend_stack user_error_handlers_error_reporting;
zend_ptr_stack user_error_handlers;
zend_ptr_stack user_exception_handlers;
zend_error_handling_t error_handling;
zend_class_entry *exception_class;
/* timeout support */
int timeout_seconds;
int lambda_count;
HashTable *ini_directives;
HashTable *modified_ini_directives;
zend_ini_entry *error_reporting_ini_entry;
zend_objects_store objects_store;
zval *exception, *prev_exception;
zend_op *opline_before_exception;
zend_op exception_op[3];
struct _zend_execute_data *current_execute_data;
struct _zend_module_entry *current_module;
zend_property_info std_property_info;
zend_bool active;
zend_op *start_op;
void *saved_fpu_cw_ptr;
#if XPFPA_HAVE_CW
XPFPA_CW_DATATYPE saved_fpu_cw;
#endif
void *reserved[ZEND_MAX_RESERVED_RESOURCES];
};
//调用
&EG(symbol_table)
C) CG() 用来访问核心全局变量。(zend/zend_globals_macros.h)
struct _zend_compiler_globals {
zend_stack bp_stack;
zend_stack switch_cond_stack;
zend_stack foreach_copy_stack;
zend_stack object_stack;
zend_stack declare_stack;
zend_class_entry *active_class_entry;
/* variables for list() compilation */
zend_llist list_llist;
zend_llist dimension_llist;
zend_stack list_stack;
zend_stack function_call_stack;
char *compiled_filename;
int zend_lineno;
zend_op_array *active_op_array;
HashTable *function_table; /* function symbol table */
HashTable *class_table; /* class table */
HashTable filenames_table;
HashTable *auto_globals;
zend_bool parse_error;
zend_bool in_compilation;
zend_bool short_tags;
zend_bool asp_tags;
zend_declarables declarables;
zend_bool unclean_shutdown;
zend_bool ini_parser_unbuffered_errors;
zend_llist open_files;
long catch_begin;
struct _zend_ini_parser_param *ini_parser_param;
int interactive;
zend_uint start_lineno;
zend_bool increment_lineno;
znode implementing_class;
zend_uint access_type;
char *doc_comment;
zend_uint doc_comment_len;
zend_uint compiler_options; /* set of ZEND_COMPILE_* constants */
zval *current_namespace;
HashTable *current_import;
zend_bool in_namespace;
zend_bool has_bracketed_namespaces;
zend_compiler_context context;
zend_stack context_stack;
/* interned strings */
char *interned_strings_start;
char *interned_strings_end;
char *interned_strings_top;
char *interned_strings_snapshot_top;
HashTable interned_strings;
const zend_encoding **script_encoding_list;
size_t script_encoding_list_size;
zend_bool multibyte;
zend_bool detect_unicode;
zend_bool encoding_declared;
#ifdef ZTS
zval ***static_members_table;
int last_static_member;
#endif
};
typedef struct _zend_compiler_globals zend_compiler_globals;
#ifdef ZTS
# define CG(v) TSRMG(compiler_globals_id, zend_compiler_globals *, v)
int zendparse(void *compiler_globals);
#else
# define CG(v) (compiler_globals.v)
extern ZEND_API struct _zend_compiler_globals compiler_globals;
int zendparse(void);
#endif
//调用
php_printf("compiled_filename : %s\n", CG(compiled_filename));
D) PG() PHP全局变量。我们知道php.ini会映射一个或者多个PHP全局结构。(main/php_globals.h)
struct _php_core_globals {
zend_bool implicit_flush;
long output_buffering;
zend_bool sql_safe_mode;
zend_bool enable_dl;
char *output_handler;
char *unserialize_callback_func;
long serialize_precision;
long memory_limit;
long max_input_time;
zend_bool track_errors;
zend_bool display_errors;
zend_bool display_startup_errors;
zend_bool log_errors;
long log_errors_max_len;
zend_bool ignore_repeated_errors;
zend_bool ignore_repeated_source;
zend_bool report_memleaks;
char *error_log;
char *doc_root;
char *user_dir;
char *include_path;
char *open_basedir;
char *extension_dir;
char *php_binary;
char *sys_temp_dir;
char *upload_tmp_dir;
long upload_max_filesize;
char *error_append_string;
char *error_prepend_string;
char *auto_prepend_file;
char *auto_append_file;
arg_separators arg_separator;
char *variables_order;
HashTable rfc1867_protected_variables;
short connection_status;
short ignore_user_abort;
unsigned char header_is_being_sent;
zend_llist tick_functions;
zval *http_globals[6];
zend_bool expose_php;
zend_bool register_argc_argv;
zend_bool auto_globals_jit;
char *docref_root;
char *docref_ext;
zend_bool html_errors;
zend_bool xmlrpc_errors;
long xmlrpc_error_number;
zend_bool activated_auto_globals[8];
zend_bool modules_activated;
zend_bool file_uploads;
zend_bool during_request_startup;
zend_bool allow_url_fopen;
zend_bool enable_post_data_reading;
zend_bool always_populate_raw_post_data;
zend_bool report_zend_debug;
int last_error_type;
char *last_error_message;
char *last_error_file;
int last_error_lineno;
char *disable_functions;
char *disable_classes;
zend_bool allow_url_include;
zend_bool exit_on_timeout;
#ifdef PHP_WIN32
zend_bool com_initialized;
#endif
long max_input_nesting_level;
long max_input_vars;
zend_bool in_user_include;
char *user_ini_filename;
long user_ini_cache_ttl;
char *request_order;
zend_bool mail_x_header;
char *mail_log;
zend_bool in_error_log;
#ifdef PHP_WIN32
zend_bool windows_show_crt_warning;
#endif
};
typedef struct _php_core_globals php_core_globals;
#ifdef ZTS
# define PG(v) TSRMG(core_globals_id, php_core_globals *, v)
extern PHPAPI int core_globals_id;
#else
# define PG(v) (core_globals.v)
extern ZEND_API struct _php_core_globals core_globals;
#endif
//调用
php_printf("user_ini_filename : %s\n", PG(user_ini_filename));
E) FG() 文件全局变量。大多数文件I/O或相关的全局变量的数据流都塞进标准扩展出口结构。(ext/standard/file.h)
typedef struct {
int pclose_ret;
size_t def_chunk_size;
long auto_detect_line_endings;
long default_socket_timeout;
char *user_agent; /* for the http wrapper */
char *from_address; /* for the ftp and http wrappers */
char *user_stream_current_filename; /* for simple recursion protection */
php_stream_context *default_context;
HashTable *stream_wrappers; /* per-request copy of url_stream_wrappers_hash */
HashTable *stream_filters; /* per-request copy of stream_filters_hash */
HashTable *wrapper_errors; /* key: wrapper address; value: linked list of char* */
int pclose_wait;
} php_file_globals;
#ifdef ZTS
#define FG(v) TSRMG(file_globals_id, php_file_globals *, v)
extern PHPAPI int file_globals_id;
#else
#define FG(v) (file_globals.v)
extern PHPAPI php_file_globals file_globals;
#endif
F) TSRMLS相关
#define TSRMLS_FETCH( ) void ***tsrm_ls = (void ***) ts_resource_ex(0, NULL)
#define TSRMG(id,type,el) (((type) (*((void ***) \
tsrm_ls))[TSRM_UNSHUFFLE_RSRC_ID(id)])->el)
#define TSRMLS_D void ***tsrm_ls
#define TSRMLS_DC , TSRMLS_D
#define TSRMLS_C tsrm_ls
#define TSRMLS_CC , TSRMLS_C