PHP5 中的 zval
// 1. zval
typedef struct _zval_struct {
zvalue_value value;
zend_uint refcount__gc;
zend_uchar type;
zend_uchar is_ref__gc;
} zval;
// 2. zvalue_value
typedef union _zvalue_value {
long lval;// 用于 bool 类型、整型和资源类型
double dval; // 用于浮点类型
struct {// 用于字符串
char *val;
int len;
} str;
HashTable *ht; // 用于数组
zend_object_value obj; // 用于对象
zend_ast *ast; // 用于常量表达式(PHP5.6 才有)
} zvalue_value;
// 3. zend_object_value
typedef struct _zend_object_value {
zend_object_handle handle;
const zend_object_handlers *handlers;
} zend_object_value;
// 4. zend_object_handle
typedef unsigned int zend_object_handle;
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