Steps to implement PHP extension class in C_PHP tutorial

Previously we briefly introduced the steps to implement PHP extension using C language. See the steps to develop PHP extension using C. That is to extend a function. Here we will explain how to use C to extend a class.

The classes to be implemented are as follows:

[php]
class Rectangle{
private $_width;
private $_height;
Public function __construct($width, $height){
          $this->_width = $width;
          $this->_height = $height;
}  
Public function clone(){
           return new Rectangle($this->_width, $this->_height);
}  
Public function setWidth($width){
          $this->_width = $width;
}  
Public function setHeight($height){
          $this->_height = $height;
}  
Public function getWidth(){
         return $this->_width;
}  
Public function getHeight(){
          return $this->_height; 
}  
Public function getArea(){
          return $this->_width * $this->_height;
}  
Public function getCircle(){
Return ($this->_width + $this->_height) * 2;
}  
}

The steps to implement class extension are as follows: (First download the PHP source code, here we use php-5.2.8)

1. Create an extended skeleton

[php]
cd php-5.2.8/ext
./ext_skel --extname=class_ext

2, modify compilation parameters
[php]
cd php-5.2.8/ext/class_ext
vi config.m4
Remove PHP_ARG_ENABLE(class_ext, whether to enable class_ext support, and
[ --enable-class_ext Enable class_ext support]) The dnl in front of the two lines, modified to:

[php]
dnl Otherwise use enable:
PHP_ARG_ENABLE(class_ext, whether to enable class_ext support,
dnl Make sure that the comment is aligned:
[ --enable-class_ext Enable class_ext support])

3. Write C code

[php]
cd php-5.2.8/ext/class_ext
vi php_class_ext.h
#Add the declaration function after PHP_FUNCTION(confirm_class_ext_compiled);

[php]
PHP_METHOD(Rectangle,__construct);
PHP_METHOD(Rectangle,clone);
PHP_METHOD(Rectangle,setWidth);
PHP_METHOD(Rectangle,setHeight);
PHP_METHOD(Rectangle,getWidth);
PHP_METHOD(Rectangle,getHeight);
PHP_METHOD(Rectangle,getArea);
PHP_METHDO(Rectangle,getCircle);

[php]
vi class_ext.c
#Declare the parameters of the method and register them in the function table

[php] 
ZEND_BEGIN_ARG_INFO(arg_construct,2) 
ZEND_ARG_INFO(0, width) 
ZEND_ARG_INFO(0, height) 
ZEND_END_ARG_INFO() 
 
ZEND_BEGIN_ARG_INFO(arg_set_width,1) 
ZEND_ARG_INFO(0, width) 
ZEND_END_ARG_INFO() 
 
ZEND_BEGIN_ARG_INFO(arg_set_height,1) 
ZEND_ARG_INFO(0, height) 
ZEND_END_ARG_INFO() 
 
const zend_function_entry class_ext_functions[] = { 
    PHP_FE(confirm_class_ext_compiled, NULL) 
    PHP_ME(Rectangle, __construct, arg_construct, ZEND_ACC_CTOR|ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, clone, NULL, ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, setWidth, NULL, ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, setHeight, NULL, ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, getWidth, NULL, ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, getHeight, NULL, ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, getArea, NULL, ZEND_ACC_PUBLIC) 
    PHP_ME(Rectangle, getCircle, NULL, ZEND_ACC_PUBLIC) 
    {NULL, NULL, NULL}  /* Must be the last line in class_ext_functions[] */ 
}; 
[php] 
#其中ZEND_ACC_CTOR表示构造函数，ZEND_ACC_PUBLIC表示访问权限为PUBLIC。 
[php] 
#接下来，在模块初始化函数中注册并初始化类 

[php]
zend_class_entry *Rectangle_ce; //zend internal class structure variable
PHP_MINIT_FUNCTION(class_ext)
{
zend_class_entry Rectangle;
INIT_CLASS_ENTRY(Rectanble, "Rectangle", class_ext_functions); //The second parameter is the class name, and the third parameter is the function list of the class
Rectangle_ce = zend_register_internal_class_ex(&Rectangle, NULL, NULL TSRMLS_CC); //Register class
zend_declare_property_null(Rectangle_ce, ZEND_STRL("_width"), ZEND_ACC_PRIVATE TSRMLS_CC); //Initialize the properties of the class _width
zend_declare_property_null(Rectangle_ce, ZEND_STRL("_height"), ZEND_ACC_PRIVATE TSRMLS_CC); //Initialize the properties of the class _height
Return SUCCESS;
}
[php]
#Add the specific implementation code of the class member function at the end of the file
[php]
PHP_METHOD(Rectangle, __construct)
{
long width,height;
If(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &width, &height) == FAILURE){ //Get the two function parameters _width and _height of the constructor
WRONG_PARAM_COUNT;
}  
If( width <= 0 ) {
           width = 1; //If _width is 0, assign the default value 1
}  
If( height <= 0 ) {
​​​​ height = 1; //If _height is 0, assign the default value 1
}  
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), width TSRMLS_CC); //Update the value of class member variable _width
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), height TSRMLS_CC); //Update the value of class member variable _height
RETURN_TRUE;
}

PHP_METHOD(Rectangle, clone)
{
zval *clone_obj;
zval *width,*height;
MAKE_STD_ZVAL(clone_obj);
object_init_ex(clone_obj, Rectangle_ce); //Initialize the object, the class to which the object belongs is Rectangle_ce
width = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), 0 TSRMLS_CC); //Get the value of class member variable _width
height = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), 0 TSRMLS_CC); //Get the value of class member variable _height
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), width TSRMLS_CC); //Update the attribute value _width of the Rectangle_ce class object clone_obj
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), height TSRMLS_CC); //Update the property value _height of the Rectangle_ce class object clone_obj
RETURN_ZVAL(clone_obj, 1, 0); //Return the object
}

PHP_METHOD(Rectangle, setWidth()
{
long width;
If(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &width) == FAILURE){
WRONG_PARAM_COUNT;
}  
If( width <= 0 ) {
         width = 1;
}  
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), width TSRMLS_CC); //Update the value of class member variable _width
RETURN_TRUE;
}

PHP_METHOD(Rectangle, setHeight()
{
long height;
If(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &height) == FAILURE){
WRONG_PARAM_COUNT;
}  
If( height <= 0 ) {
height = 1;
}  
zend_update_property_long(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), height TSRMLS_CC); //Update the value of class member variable _height
RETURN_TRUE;
}

PHP_METHOD(Rectangle, getWidth)
{
    zval *zWidth; 
    long width; 
    zWidth = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), 0 TSRMLS_CC); //获取类成员变量_width的值 
    width = Z_LVAL_P(zWidth); 
    RETURN_LONG(width); 
} 
 
PHP_METHOD(Rectangle, getHeight) 
{ 
    zval *zHeight; 
    long height; 
    zHeight = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), 0 TSRMLS_CC); 
    height = Z_LVAL_P(zHeight); 
    RETURN_LONG(height); 
} 
 
PHP_METHOD(Rectangle, getArea) 
{ 
    zval *zWidth,*zHeight; 
    long width,height,area; 
    zWidth = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), 0 TSRMLS_CC); 
    zHeight = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), 0 TSRMLS_CC); 
    width = Z_LVAL_P(zWidth); 
    height = Z_LVAL_P(zHeight); 
    area = width * height; 
    RETURN_LONG(area); 
} 
 
PHP_METHOD(Rectangle, getCircle) 
{ 
    zval *zWidth,*zHeight; 
    long width,height,circle; 
    zWidth = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_width"), 0 TSRMLS_CC); 
    zHeight = zend_read_property(Z_OBJCE_P(getThis()), getThis(), ZEND_STRL("_height"), 0 TSRMLS_CC); 
    width = Z_LVAL_P(zWidth); 
    height = Z_LVAL_P(zHeight); 
    circle = (width + height) * 2; 
    RETURN_LONG(circle); 
} 

4，编译代码

[php] 
cd php-5.2.8/ext/class_ext 
/usr/local/php/bin/phpize 
./configure --with-php-config=/usr/local/php/bin/php-config 
make  
make install 

此时会在php的安装路径下产生一个so文件，比如
/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/class_ext.so

修改php.ini 添加扩展extension_dir = "/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/"
[class_ext]
extension = class_ext.so
5，测试代码

[php] 
$width = -10; 
$height = 12; 
$rectangle = new Rectangle($width, $height); 
$area = $rectangle->getArea(); 
var_dump($area); 
$circle = $rectangle->getCircle(); 
var_dump($circle); 
$clone = $rectangle->clone(); 
$_area = $clone->getArea(); 
var_dump($_area); 
$clone->setWidth(100); 
$clone->setHeight(200); 
$_area = $clone->getArea(); 
var_dump($_area); 
$width = $clone->getWidth(); 
var_dump($width); 
$height = $clone->getHeight(); 
var_dump($height); 

结果输出：
[php] 
int(12) 
int(26) 
int(12) 
int(20000) 
int(100) 
int(200) 

 

 

 

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