php扩展类开发实例

 class Vector2D
 {
 private $_x;
 private $_y;

 /**
 * Constructor.
 */
 public function __construct($x = 0, $y = 0)
 {
 $this->_x = $x;
 $this->_y = $y;
 }

 /**
 * Generates a copy of $this vector.
 * @return Vector2D A copy of $this vector.
 */
 public function mycopy()
 {
 return new Vector2D($this->_x, $this->;_y);
 }

 /**
 * Sets $this vector's x and y values, and thus length, to zero.
 * @return Vector2D A reference to $this vector.
 */
 public function zero()
 {
 $this->_x = 0;
 $this->_y = 0;
 return $this;
 }

 /**
 * Whether or not $this vector is equal to zero, i.e. its x, y, and length are zero.
 * @return Boolean True if vector is zero, otherwise false.
 */
 public function isZero()
 {
 return $this->_x == 0 && $this->_y == 0;
 }
 public function getX()
 {
 return $this->_x;
 }
 public function getY()
 {
 return $this->_y;
 }
 }

第一步：建立扩展骨架

 cd php-5.2.14/ext./ext_skel

 --extname=vector

第二步：修改编译参数

 cd php-5.2.14/ext/vector
 vi config.m4

去掉

 PHP_ARG_ENABLE(vector, whether to enable vector support,
 [ --enable-vector Enable vector support])

两行前面的dnl

修改后为：

 dnl Otherwise use enable:

 PHP_ARG_ENABLE(vector, whether to enable vector support,

 dnl Make sure that the comment is aligned:

 [ --enable-vector Enable vector support])

第三步：编写代码
vim php_vector.h

在
PHP_FUNCTION(confirm_vector_compiled); /* For testing, remove later. */
后面增加声明函数

 PHP_METHOD(Vector2D, __construct);
 PHP_METHOD(Vector2D, mycopy);
 PHP_METHOD(Vector2D, zero);
 PHP_METHOD(Vector2D, isZero);
 PHP_METHOD(Vector2D, getX);
 PHP_METHOD(Vector2D, getY);

vim vector.c
声明方法的参数，注册到函数表中

 ZEND_BEGIN_ARG_INFO(arg_construct, 2) //声明arg_construct为含有x,y的2个参数
 ZEND_ARG_INFO(0, x)
 ZEND_ARG_INFO(0, y)
 ZEND_END_ARG_INFO() 

 zend_function_entry vector_functions[] = {
 PHP_FE(confirm_vector_compiled, NULL) /* For testing, remove later. */
 PHP_ME(Vector2D, __construct, arg_construct, ZEND_ACC_PUBLIC|ZEND_ACC_CTOR)//
 PHP_ME(Vector2D, mycopy, NULL, ZEND_ACC_PUBLIC)
 PHP_ME(Vector2D, zero, NULL, ZEND_ACC_PUBLIC)
 PHP_ME(Vector2D, isZero, NULL, ZEND_ACC_PUBLIC)
 PHP_ME(Vector2D, getX, NULL, ZEND_ACC_PUBLIC)
 PHP_ME(Vector2D, getY, NULL, ZEND_ACC_PUBLIC)
 {NULL, NULL, NULL} /* Must be the last line in vector_functions[] */
 }; 

ZEND_ACC_CTOR表示为构造函数
ZEND_ACC_PUBLIC为访问权限标记，表示public访问权限

在模块初始化函数中注册并初始化类

 zend_class_entry *Vector2D_ce; //类结构变量
 PHP_MINIT_FUNCTION(vector)
 {
 /* If you have INI entries, uncomment these lines
 REGISTER_INI_ENTRIES();
 */
 zend_class_entry Vector2D;

 INIT_CLASS_ENTRY(Vector2D, "Vector2D", vector_functions);//第二个参数为类名，第三个参数为函数表
 Vector2D_ce = zend_register_internal_class_ex(&Vector2D, NULL, NULL TSRMLS_CC);//注册类

 zend_declare_property_null(Vector2D_ce, ZEND_STRL("_x"), ZEND_ACC_PRIVATE TSRMLS_CC);//初始化_x属性
 zend_declare_property_null(Vector2D_ce, ZEND_STRL("_y"), ZEND_ACC_PRIVATE TSRMLS_CC);//初始化_y属性

 return SUCCESS;
 }

在文件最后面增加具体类方法的实现代码：

 PHP_METHOD(Vector2D, __construct) {
         long int x,y;
         //获取x,y参数
         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &x, &y) == FAILURE) {
                 WRONG_PARAM_COUNT;
         }

         //更改_x,_y属性值
         zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_x"), x TSRMLS_CC);
         zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_y"), y TSRMLS_CC);

         RETURN_TRUE;
 }

 PHP_METHOD(Vector2D, mycopy) {
         zval *copy_obj;
         zval *x_value,*y_value;

         MAKE_STD_ZVAL(copy_obj);
         //初始化对象，对象所属的类为Vector2D_ce
         object_init_ex(copy_obj, Vector2D_ce);

         //获得_x,_y的属性值
         x_value = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_x"), 0 TSRMLS_CC);
         y_value = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_y"), 0 TSRMLS_CC);

         //更新Vector2D_ce类对象copy_obj的属性值_x,_y
         zend_update_property(Z_OBJCE_P(getThis()), copy_obj, ZEND_STRL("_x"), x_value TSRMLS_CC);
         zend_update_property(Z_OBJCE_P(getThis()), copy_obj, ZEND_STRL("_y"), y_value TSRMLS_CC);
         //返回该对象
         RETURN_ZVAL(copy_obj, 1, 0);
 }

 PHP_METHOD(Vector2D, zero) {
        //更改_x,_y的属性值为0
         zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_x"), 0 TSRMLS_CC);
         zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_y"), 0 TSRMLS_CC);
         //返回当前类实例
         RETURN_ZVAL(getThis(), 1, 0);;
 }

 PHP_METHOD(Vector2D, isZero) {

         zval *zx, *zy;
         long x,y;
         // 获得_x,_y的属性值
         zx = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_x"), 0 TSRMLS_CC);
         zy = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_y"), 0 TSRMLS_CC);

         x = Z_LVAL_P(zx);
         y = Z_LVAL_P(zy);

         if(x==0 && y==0){
                 RETURN_BOOL(1);
         }else{
                 RETURN_BOOL(0);
         }

 }

 PHP_METHOD(Vector2D, getX) {

         zval *zx;
         long x;

         zx = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_x"), 0 TSRMLS_CC);
         x = Z_LVAL_P(zx);

         RETURN_LONG(x);
 }

 PHP_METHOD(Vector2D, getY) {

         zval *zy;
         long y;

         zy = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_y"), 0 TSRMLS_CC);
         y = Z_LVAL_P(zy);

         RETURN_LONG(y);
 }

第四步：编译代码

 cd php-5.2./ext/vector
 /opt/module/php/bin/phpize
 ./configure --with-php-config=/opt/module/php/bin/php-config
 make
 make install  

第五步：配置扩展

在[PHP]模块下增加：

 extension = vector.so
 service httpd restart