摘要：這裡閱讀的php版本為PHP-7.1.0 RC3，閱讀程式碼的平台為linuxCGCG是從全域的compiler_global取得屬性值，裡面儲存的就是編譯過程使用到的全域變數。 struct _zend_compiler_globals { zend_stack loop_var_stack; zen ...
這裡閱讀的php版本為PHP-7.1.0 RC3，閱讀程式碼的平台為linux
CG
CG是從全域的儲存值，global就是編譯過程使用到的全域變數。
01 struct _zend_compiler_globals {
02 zend_stack loop_var_stack;
03
04 zend_class_entry *active_class_entry;
05
06 zend_string *compiled_filename;
07
08 int zend_lineno;
09
10 zend_op_array *active_op_array;
11
12 HashTable *function_table; /* function symbol table */
13 HashTable *class_table; /* class table */
14
15 HashTable filenames_table;
16
17 HashTable *auto_globals;
18
19 zend_bool parse_error;
20 zend_bool in_compilation;
21 zend_bool short_tags;
22
23 zend_bool unclean_shutdown;
24
25 zend_bool ini_parser_unbuffered_errors;
26
27 zend_llist open_files;
28
29 struct _zend_ini_parser_param *ini_parser_param;
30
31 uint32_t start_lineno; // 执行文件开始执行的行号
32 zend_bool increment_lineno;
33
34 zend_string *doc_comment;
35 uint32_t extra_fn_flags;
36
37 uint32_t compiler_options; /* set of ZEND_COMPILE_* constants */
38
39 HashTable const_filenames;
40
41 zend_oparray_context context;
42 zend_file_context file_context;
43
44 zend_arena *arena;
45
46 zend_string *empty_string;
47 zend_string *one_char_string[256];
48 zend_string **known_strings;
49 uint32_t known_strings_count;
50
51 HashTable interned_strings;
52
53 const zend_encoding **script_encoding_list;
54 size_t script_encoding_list_size;
55 zend_bool multibyte;
56 zend_bool detect_unicode;
57 zend_bool encoding_declared;
58
59 zend_ast *ast;
60 zend_arena *ast_arena;
61
62 zend_stack delayed_oplines_stack;
63
64 #ifdef ZTS
65 zval **static_members_table;
66 int last_static_member;
67 #endif
68 };登入後複製
SG
01 SG是从全局的sapi_global中获取属性值
02
03 // TODO：更新
04 typedef struct _sapi_globals_struct {
05 void *server_context;
06 sapi_request_info request_info; // 请求信息
07 sapi_headers_struct sapi_headers;
08 int64_t read_post_bytes;
09 unsigned char post_read;
10 unsigned char headers_sent;
11 zend_stat_t global_stat;
12 char *default_mimetype;
13 char *default_charset;
14 HashTable *rfc1867_uploaded_files;
15 zend_long post_max_size;
16 int options;
17 zend_bool sapi_started;
18 double global_request_time;
19 HashTable known_post_content_types;
20 zval callback_func;
21 zend_fcall_info_cache fci_cache;
22 } sapi_globals_struct;登入後複製
EG
EG是從executor_globals中取得變數
01 // TODO: 更新
02 struct _zend_executor_globals {
03 zval uninitialized_zval;
04 zval error_zval;
05
06 /* symbol table cache */
07 zend_array *symtable_cache[SYMTABLE_CACHE_SIZE];
08 zend_array **symtable_cache_limit;
09 zend_array **symtable_cache_ptr;
10
11 zend_array symbol_table; /* main symbol table */
12
13 HashTable included_files; /* files already included */
14
15 JMP_BUF *bailout;
16
17 int error_reporting;
18 int exit_status;
19
20 HashTable *function_table; /* function symbol table */
21 HashTable *class_table; /* class table */
22 HashTable *zend_constants; /* constants table */
23
24 zval *vm_stack_top;
25 zval *vm_stack_end;
26 zend_vm_stack vm_stack;
27
28 struct _zend_execute_data *current_execute_data;
29 zend_class_entry *fake_scope; /* used to avoid checks accessing properties */
30
31 zend_long precision;
32
33 int ticks_count;
34
35 HashTable *in_autoload;
36 zend_function *autoload_func;
37 zend_bool full_tables_cleanup;
38
39 /* for extended information support */
40 zend_bool no_extensions;
41
42 zend_bool vm_interrupt;
43 zend_bool timed_out;
44 zend_long hard_timeout;
45
46 #ifdef ZEND_WIN32
47 OSVERSIONINFOEX windows_version_info;
48 #endif
49
50 HashTable regular_list;
51 HashTable persistent_list;
52
53 int user_error_handler_error_reporting;
54 zval user_error_handler;
55 zval user_exception_handler;
56 zend_stack user_error_handlers_error_reporting;
57 zend_stack user_error_handlers;
58 zend_stack user_exception_handlers;
59
60 zend_error_handling_t error_handling;
61 zend_class_entry *exception_class;
62
63 /* timeout support */
64 zend_long timeout_seconds;
65
66 int lambda_count;
67
68 HashTable *ini_directives;
69 HashTable *modified_ini_directives;
70 zend_ini_entry *error_reporting_ini_entry;
71
72 zend_objects_store objects_store;
73 zend_object *exception, *prev_exception;
74 const zend_op *opline_before_exception;
75 zend_op exception_op[3];
76
77 struct _zend_module_entry *current_module;
78
79 zend_bool active;
80 zend_bool valid_symbol_table;
81
82 zend_long assertions;
83
84 uint32_t ht_iterators_count; /* number of allocatd slots */
85 uint32_t ht_iterators_used; /* number of used slots */
86 HashTableIterator *ht_iterators;
87 HashTableIterator ht_iterators_slots[16];
88
89 void *saved_fpu_cw_ptr;
90 #if XPFPA_HAVE_CW
91 XPFPA_CW_DATATYPE saved_fpu_cw;
92 #endif
93
94 zend_function trampoline;
95 zend_op call_trampoline_op;
96
97 void *reserved[ZEND_MAX_RESERVED_RESOURCES];
98 };登入後複製
以上是php核心分析（三）－全域變數的內容，更多相關內容請注意PHPHPcnPcn. ）！
