PHP中的面向对象

先看PHP源码中对变量的定义

#zend/zend.h
typedef union_zvalue_value
{
long lval;/* long value */
double dval;/* double value */
struct
{
char *val;
int len;
}
HashTalbe *ht /* hash table value */
zend_object_value obj;
} zvalue_value;

zvalue_value, 就是PHP底层的变量类型,zend_object_value obj就是变量的一个结构,接着看对象的底层实现,在PHP5中,对象在底层的实现是采取"属性数组+方法数组"来实现的,简单的理解为PHP对象在底层的存储如下图

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" alt="" />

对象在PHP中是使用一种zend_object_value结构体来存储的.对象在ZEND(PHP底层引擎,类似Java的JVM)中的定义如下:

typedef struct_zend_object
{
zend_class_entry *ce; //这里就是类的入口
HashTable *properties; //属性组成的HashTable
HashTable *guards; /*protect from __get/__set...recursion */
} zend_object;
ce是存储该对象的类结构,在对象初始化时保存了类的入口,相当于指针的作用.properties是一个HashTable,用来存放对象属性.guards用来阻止递归调用.
类的标准方法在zend/zend_object_handlers.h文件中定义,具体实现则是在zend/zend_object_handlers.c文件中.

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