用C实现PHP扩张类
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2022-05-15 11:16:44
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用C实现PHP扩展类
2,修改编译参数
3,编写C代码
前面简单介绍了用C语言实现PHP扩展的步骤,见用C开发PHP扩展的步骤,那个是扩展一个函数,这里讲述一下如何用C扩展类。
准备实现的类如下:
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; } }
实现类扩展的步骤如下:(首先下载PHP源码,这里使用的是php-5.2.8)
1,建立扩展骨架
cd php-5.2.8/ext ./ext_skel --extname=class_ext
2,修改编译参数
cd php-5.2.8/ext/class_ext vi config.m4去掉PHP_ARG_ENABLE(class_ext, whether to enable class_ext support,和
[ --enable-class_ext Enable class_ext support])两行前面的dnl,修改后为:
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,编写C代码
cd php-5.2.8/ext/class_ext vi php_class_ext.h #在 PHP_FUNCTION(confirm_class_ext_compiled); 后面增加申明函数;
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);
vi class_ext.c #申明方法的参数,注册到函数表中
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[] */ };
#其中ZEND_ACC_CTOR表示构造函数,ZEND_ACC_PUBLIC表示访问权限为PUBLIC。
#接下来,在模块初始化函数中注册并初始化类
zend_class_entry *Rectangle_ce; //zend内部类结构变量 PHP_MINIT_FUNCTION(class_ext) { zend_class_entry Rectangle; INIT_CLASS_ENTRY(Rectanble, "Rectangle", class_ext_functions); //第二个参数为类名,第三个参数为类的函数列表 Rectangle_ce = zend_register_internal_class_ex(&Rectangle, NULL, NULL TSRMLS_CC); //注册类 zend_declare_property_null(Rectangle_ce, ZEND_STRL("_width"), ZEND_ACC_PRIVATE TSRMLS_CC); //初始化类的属性_width zend_declare_property_null(Rectangle_ce, ZEND_STRL("_height"), ZEND_ACC_PRIVATE TSRMLS_CC); //初始化类的属性_height return SUCCESS; }
#在文件最后增加类的成员函数的具体实现代码
PHP_METHOD(Rectangle, __construct) { long width,height; if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &width, &height) == FAILURE){ //获取构造函数的两个函数参数_width和_height WRONG_PARAM_COUNT; } if( width4,编译代码
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.so5,测试代码
$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:
int(12) int(26) int(12) int(20000) int(100) int(200)
6,Over!
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