PHP extension development: How to design custom functions to support object-oriented programming?

PHP extensions can support object-oriented programming by designing custom functions to create objects, access properties, and call methods. First create a custom function to instantiate the object, and then define functions that get properties and call methods. In practice, we can customize the function to create a MyClass object, obtain its my_property attribute, and call its my_method method.

How to design custom PHP functions to support object-oriented programming

PHP extensions are powerful tools that can enhance PHP function. To support object-oriented programming (OOP), we can design custom functions to create objects, access properties, and call methods.

Create a custom function

First, we need to create a custom function to instantiate our object. We can use the zend_function_entry structure to define function information:

zend_function_entry my_custom_functions[] = {
    PHP_FE(create_my_object, NULL)
};

Next, we implement the create_my_object function to create an object:

PHP_FUNCTION(create_my_object)
{
    zend_class_entry *ce; // 类条目
    zend_object_handlers handlers; // 对象处理程序
    const zend_class_entry *my_class_entry; // 我的类条目

    // 获取我的类条目
    my_class_entry = zend_fetch_class("MyClass", sizeof("MyClass") - 1, ZEND_FETCH_CLASS_DEFAULT);

    // 初始化对象处理程序
    memset(&handlers, 0, sizeof(zend_object_handlers));
    handlers.offset = XtOffsetOf(custom_object, std);
    handlers.free_obj = free_custom_object;

    // 创建对象
    object = zend_objects_new(sizeof(custom_object), my_class_entry, &handlers);
    if (!object) {
        zend_throw_exception_ex(zend_ce_exception, 0, "Could not create object");
        return;
    }

    RETURN_OBJ(&object);
}

Access properties

In order to access object properties, we can customize a get function:

PHP_FUNCTION(get_my_property)
{
    zend_object *object;
    const char *property_name;
    size_t property_name_len;
    custom_object *obj;

    ZEND_PARSE_PARAMETERS_START(2, 2)
        Z_PARAM_OBJECT(object)
        Z_PARAM_STRING(property_name, property_name_len)
    ZEND_PARSE_PARAMETERS_END();

    obj = zend_object_store_get_object(object);
    RETURN_LONG(obj->my_property);
}

Call method

Similarly, we also Object methods can be called by custom calling functions:

PHP_FUNCTION(call_my_method)
{
    zend_object *object;
    const char *method_name;
    size_t method_name_len;
    zval *args, *retval;
    custom_object *obj;

    ZEND_PARSE_PARAMETERS_START(3, 3)
        Z_PARAM_OBJECT(object)
        Z_PARAM_STRING(method_name, method_name_len)
        Z_PARAM_ARRAY(args)
    ZEND_PARSE_PARAMETERS_END();

    obj = zend_object_store_get_object(object);

    call_user_function(CG(function_table), args, retval, method_name, method_name_len, obj);

    RETURN_ZVAL(retval, 1, 0);
}

Practical case

Suppose we have a class named MyClass, which has A property named my_property and a method named my_method. Let's use a custom function to create an object of this class, get its properties and call its methods:

<?php

// 加载自定义函数
zend_register_functions(my_custom_functions, sizeof(my_custom_functions));

// 创建对象
$my_object = create_my_object();

// 获取属性
$my_property = get_my_property($my_object, "my_property");

// 调用方法
call_my_method($my_object, "my_method", array("arg1", "arg2"));

?>

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