Static variable it can be a static global variable, if not called unset, then this static variable will persist until the program exits by Zend Memory management to release it can be a static local variable: defined in a function, after the function is executed, the static variable does not disappear it can be a static member variable: defined in the class , which can be shared among objects of all classes, such as "Static" {return t_static;} is a macro then open ZEND/ZEND_LANGUAGE_PARESER.L search t_static find code t_static static_var_list '; ' Follow up Static_va R_list Find Code static_var_list:static_var_list ', ' t_variable {zend_do_fetch_static_variable (&$3, NULL, ZEND_FETCH_ STATIC tsrmls_cc); } | Static_var_list ', ' t_variable ' = ' static_scalar {zend_do_fetch_static_variable (&$3, &$5, ZEND_FETCH_STATIC TSRMLS_CC); } | t_variable {zend_do_fetch_static_variable (&$1, NULL, zend_fetch_static tsrmls_cc);} | T_variable ' = ' static_scalar {zend_do_fetch_static_variable (&$1, &$3, zend_fetch_static TSRMLS_CC);}; Here it is. It is parsed by the PHP parser into the above code zend_do_fetch_static_variable this function is it in the ZEND/ZEND_COMPILE.C definition code as follows void Zend_do_fetch_static_ Variable (znode *varname, const znode *static_assignment, int fetch_type tsrmls_dc) {zval *tmp;//A temporary variable zend_op *opline; Znode lval; Znode result; Alloc_zval (TMP); Request a piece of memory if (static_assignment) {*tmp = static_assignment->u.constant;} else {init_zval (*tmp);} if (! CG (ACTIVe_op_array)->static_variables) {//Initialize the hash key value of the static variable alloc_hashtable (CG (Active_op_array)->static_variables); /Initialize hash value Zend_hash_init (CG (Active_op_array)->static_variables, 2, NULL, Zval_ptr_dtor, 0); } zend_hash_update (CG (Active_op_array)->static_variables, Varname->u.constant.value.str.val, varname-> U.constant.value.str.len+1, &tmp, sizeof (Zval *), NULL); if (Varname->op_type = = Is_const) {if (Z_type (varname->u.constant)! = is_string) {convert_to_string (& Varname->u.constant); }} opline = Get_next_op (CG (Active_op_array) tsrmls_cc); Opline->result.op_type = Is_var; Opline->result.u.ea.type = 0; Opline->result.u.var = get_temporary_variable (CG (Active_op_array)); OPLINE->OP1 = *varname; Set_unused (OPLINE->OP2); Opline->op2.u.ea.type = zend_fetch_static; result = opline->result; if (Varname->op_type = = Is_const) {zval_copy_ctor (&varname->u.constant);} fetch_simple_variable (&lval , varname, 0 tsrmls_cc); /* relies onThe fact, the default fetch is Bp_var_w */www.2cto.com if (Fetch_type = = zend_fetch_lexical) {Znode dummy; zend_do_b Egin_variable_parse (Tsrmls_c); Zend_do_assign (&dummy, &lval, &result tsrmls_cc); Zend_do_free (&dummy tsrmls_cc); } else {zend_do_assign_ref (NULL, &lval, &result tsrmls_cc);} CG (Active_op_array)->OPCODES[CG (active_op_array)->last-1].result.u.ea.type |= EXT_TYPE_UNUSED; /* Zval_dtor (&varname->u.constant); */ }
http://www.bkjia.com/PHPjc/477784.html www.bkjia.com true http://www.bkjia.com/PHPjc/477784.html techarticle static variable It can be a static global variable, if not called unset, then this static variable will persist until the program exits by Zend Memory management to release it can be static local ...
