PHP内核两大流程之请求处理

static int php_handler(request_rec *r){	/* Initiliaze the context */        php_struct * volatile ctx;        void *conf;        apr_bucket_brigade * volatile brigade;        apr_bucket *bucket;        apr_status_t rv;        request_rec * volatile parent_req = NULL;        TSRMLS_FETCH();	......        zend_file_handle zfd;        zfd.type = ZEND_HANDLE_FILENAME;        zfd.filename = (char *) r->filename;        zfd.free_filename = 0;        zfd.opened_path = NULL;	zend_execute_scripts(ZEND_INCLUDE TSRMLS_CC, NULL, 1, &zfd);	......}ZEND_API int zend_execute_scripts(int type TSRMLS_DC, zval **retval, int file_count, ...) /* {{{ */{	......	EG(active_op_array) = \	zend_compile_file(file_handle, type TSRMLS_CC);	......	zend_execute(EG(active_op_array) TSRMLS_CC);	......}    ZEND_API void execute(zend_op_array *op_array TSRMLS_DC)      {          // ??????琛??涓??          zend_execute_data execute_data;                // 濡?????甯稿氨???烘?琛?         if (EG(exception)) {              return;          }                /* Initialize execute_data */          EX(fbc) = NULL; // ???????ㄨ??ㄧ??芥?          EX(object) = NULL; // ???????ㄨ??ㄧ?瀵硅薄          EX(old_error_reporting) = NULL; // ??????璇???????                   // 涓烘?琛?????绌洪?          if (op_array->T < TEMP_VAR_STACK_LIMIT) {              EX(Ts) = (temp_variable *) do_alloca(sizeof(temp_variable) * op_array->T);          } else {              EX(Ts) = (temp_variable *) safe_emalloc(sizeof(temp_variable), op_array->T, 0);          }          // 涓轰复?跺??????┖?村苟??????浜?┖??         EX(CVs) = (zval***)do_alloca(sizeof(zval**) * op_array->last_var);          memset(EX(CVs), 0, sizeof(zval**) * op_array->last_var);                    EX(op_array) = op_array;                    // ????ц?涓????         EX(original_in_execution) = EG(in_execution);          EX(symbol_table) = EG(active_symbol_table);          EX(prev_execute_data) = EG(current_execute_data); // 灏?????灞????涓???ц??版????          EG(current_execute_data) = &execute_data; // 灏?????琛??涓?????                EG(in_execution) = 1;          // ??????涓?涓??浠?opcode)          /*         #define ZEND_VM_SET_OPCODE(new_op) \         CHECK_SYMBOL_TABLES() \         EX(opline) = new_op                  execute_data.opline 涓哄????琛?? opcode         */          if (op_array->start_op) {              ZEND_VM_SET_OPCODE(op_array->start_op);          } else {              ZEND_VM_SET_OPCODE(op_array->opcodes);          }                if (op_array->uses_this && EG(This)) {              EG(This)->refcount++; /* For $this pointer */              if (zend_hash_add(EG(active_symbol_table), "this", sizeof("this"), &EG(This), sizeof(zval *), NULL)==FAILURE) {                  EG(This)->refcount--;              }          }                // 灏????pline???瀛????璧?? executor_globals.online_ptr 锛??浠ュ??惰?韪?pcode???琛?         EG(opline_ptr) = &EX(opline);                EX(function_state).function = (zend_function *) op_array;          EG(function_state_ptr) = &EX(function_state);      #if ZEND_DEBUG          /* function_state.function_symbol_table is saved as-is to a stack,          * which is an intentional UMR.  Shut it up if we're in DEBUG.          */          EX(function_state).function_symbol_table = NULL;      #endif                    while (1) {      #ifdef ZEND_WIN32              if (EG(timed_out)) {                  zend_timeout(0);              }      #endif                            // 寰??璋??姣?釜opline??handler ?芥?锛??????ㄥ??芥????锛?????煎ぇ浜?锛?氨????             if (EX(opline)->handler(&execute_data TSRMLS_CC) > 0) {            return;              }                }          zend_error_noreturn(E_ERROR, "Arrived at end of main loop which shouldn't happen");      }