Pecl-PHP extension API version

I am writing a PHP extension recently. it is found that the internal iterator interface functions of the two versions have some changes, the differences are as follows: {code ...} this change is associated with the PHP version: {code ...} still associated with extended version: {code ...} how can I adapt to different versions of Apis? I am writing a PHP extension recently.
It is found that the internal iterator interface functions of the two versions have some changes, the differences are as follows:

{php-src}/Zend/zend_interface.c (in 5.3.X): ZEND_API void zend_user_it_get_current_key(zend_object_iterator *_iter, char **str_key, uint *str_key_len, ulong *int_key TSRMLS_DC)----------------------------------------------------------------------------------{php-src}/Zend/zend_interface.c (in 5.4.X): ZEND_API void zend_user_it_get_current_key(zend_object_iterator *_iter, zval *key TSRMLS_DC)

This change is associated with the PHP version:

5.3---5.4

Associated with the extended version:

PHP Api Version:         20100412Zend Module Api No:      20100525Zend Extension Api No:   220100525----------------------------------PHP Api Version:         20090626Zend Module Api No:      20090626Zend Extension Api No:   220090626

How can I adapt to different versions of Apis?

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I am writing a PHP extension recently.
It is found that the internal iterator interface functions of the two versions have some changes, the differences are as follows:

{php-src}/Zend/zend_interface.c (in 5.3.X): ZEND_API void zend_user_it_get_current_key(zend_object_iterator *_iter, char **str_key, uint *str_key_len, ulong *int_key TSRMLS_DC)----------------------------------------------------------------------------------{php-src}/Zend/zend_interface.c (in 5.4.X): ZEND_API void zend_user_it_get_current_key(zend_object_iterator *_iter, zval *key TSRMLS_DC)

This change is associated with the PHP version:

5.3---5.4

Associated with the extended version:

PHP Api Version:         20100412Zend Module Api No:      20100525Zend Extension Api No:   220100525----------------------------------PHP Api Version:         20090626Zend Module Api No:      20090626Zend Extension Api No:   220090626

How can I adapt to different versions of Apis?

At least from the source code, it does not matter with ZEND_MODULE_API_NO and ZEND_EXTENSION_API_NO.
It can only be PHP_API_VERSION.

zend_interfaces.cIn this example, some userspace iterator interfaces are defined.
Are you using the source code of the 5.4 Development Branch? This function interface is modified to: Added support for non-scalar Iterator keys in foreach.
However, this feature is supported only when it is 5.5.zend_user_it_get_current_keyThe signature of this function remains unchanged.

In my opinion, one way is:

#if PHP_API_VERSION < 20120000#else#endif

But I never step on it.