// 1. zvaltypedef struct _zval_struct { zvalue_value value; zend_uint refcount__gc; zend_uchar type; zend_uchar is_ref__gc;} zval;// 2. zvalue_valuetypedef union _zvalue_value { long lval;  // 用于 bool 類型、整型和資源類型 double dval; // 用于浮點類型 struct {  // 用于字符串  char *val;  int len; } str; HashTable *ht; // 用于數組 zend_object_value obj; // 用于對象 zend_ast *ast; // 用于常量表達式(PHP5.6 才有)} zvalue_value;// 3. zend_object_valuetypedef struct _zend_object_value { zend_object_handle handle; const zend_object_handlers *handlers;} zend_object_value;// 4. zend_object_handletypedef unsigned int zend_object_handle;

// 1. zvalstruct _zval_struct { zend_value  value;   /* value */ union {  struct {   ZEND_ENDIAN_LOHI_4(    zend_uchar type,   /* active type */    zend_uchar type_flags,    zend_uchar const_flags,    zend_uchar reserved)  /* call info for EX(This) */  } v;  uint32_t type_info; } u1; union {  uint32_t  next;     /* hash collision chain */  uint32_t  cache_slot;   /* literal cache slot */  uint32_t  lineno;    /* line number (for ast nodes) */  uint32_t  num_args;    /* arguments number for EX(This) */  uint32_t  fe_pos;    /* foreach position */  uint32_t  fe_iter_idx;   /* foreach iterator index */  uint32_t  access_flags;   /* class constant access flags */  uint32_t  property_guard;  /* single property guard */ } u2;};// 2. zend_valuetypedef union _zend_value { zend_long   lval;    /* long value */ double   dval;    /* double value */ zend_refcounted *counted; zend_string  *str; zend_array  *arr; zend_object  *obj; zend_resource *res; zend_reference *ref; zend_ast_ref  *ast; zval    *zv; void    *ptr; zend_class_entry *ce; zend_function *func; struct {  uint32_t w1;  uint32_t w2; } ww;} zend_value;