PHP Extension Development Notes (8) inheriting and implementing interfaces

Inherited

We customize a exception class, PHP code:

classTestExceptionextendsException {}

Code implementation:

#include "Zend/zend_exceptions.h"zend_class_entry *test_exception_ce;PHP_MINIT_FUNCTION(test){    zend_class_entry tmp_ce;    "TestException", NULL);    test_exception_ce = zend_register_internal_class_ex(&tmp_ce, zend_exception_get_default(TSRMLS_C), NULL TSRMLS_CC);    return SUCCESS;}

The main thing is to implement a custom exception class without a method, and inherit the exception class. Using zend_register_internal_class_ex this macro with the _EX suffix, the second parameter of the macro zend_exception_get_default (note header file) Specifies the parent class, you can also specify the parent class by the way of the class name, you can see zend_register_internal_class_ex the definition

/ * If PARENT_CE is isn't null then it inherits from Parent_ce * If parent_ce are NULL and parent_name isn ' t then it looks For the parent and inherits from it * If both Parent_ce and Parent_name is NULL it does a regular class registration * I F parent_name is specified and not found NULL is returned * /Zend_api zend_class_entry *zend_register_internal_class_ex (zend_class_entry *class_entry, Zend_class_entry *parent_ CeChar*parent_name tsrmls_dc)/* {{{ */{Zend_class_entry *register_class;if(!parent_ce && parent_name) {Zend_class_entry **pce;if(Zend_hash_find (CG (class_table), Parent_name,strlen(parent_name) +1, (void* *) &PCE) ==failure) {returnNULL; }Else{parent_ce = *pce; }} Register_class = Zend_register_internal_class (Class_entry tsrmls_cc);if(PARENT_CE)    {zend_do_inheritance (Register_class, Parent_ce tsrmls_cc); }returnRegister_class;}/* }}} */

This method must be in parent_name lowercase when it is passed in, otherwise zend_hash_find it will fail to return NULL when looking for the class name (), for example:

"exception"//如果是Exception就会继承失败

Interface definition

"TestDataClass", test_data_interface_methodsd);test_data_interface = zend_register_internal_class(&tmp_interface_ce TSRMLS_CC);/* TestDataClass implements Countable, ArrayAccess, IteratorAggregate */zend_class_implements(    3, spl_ce_Countable, zend_ce_arrayaccess, zend_ce_aggregate);return SUCCESS;

The above describes the PHP extension development Note (8) to inherit and implement the interface, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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