Edit File: README.EXTENSIONS
This file describes extension module API details. Refer to README.EXT_SKEL to create extension skeleton files. Refer to Hacker's Guide for PHP internals. http://www.php.net/manual/en/internals2.php Between PHP 4.0.6 and 4.1.0, the Zend module struct changed in a way that broke both source and binary compatibility. If you are maintaining a third party extension, here's how to update it: If this was your old module entry: zend_module_entry foo_module_entry = { "foo", /* extension name */ foo_functions, /* extension function list */ NULL, /* extension-wide startup function */ NULL, /* extension-wide shutdown function */ PHP_RINIT(foo), /* per-request startup function */ PHP_RSHUTDOWN(foo), /* per-request shutdown function */ PHP_MINFO(foo), /* information function */ STANDARD_MODULE_PROPERTIES }; Here's how it should look if you want your code to build with PHP 4.1.0 and up: zend_module_entry foo_module_entry = { #if ZEND_MODULE_API_NO >= 20010901 STANDARD_MODULE_HEADER, #endif "foo", /* extension name */ foo_functions, /* extension function list */ NULL, /* extension-wide startup function */ NULL, /* extension-wide shutdown function */ PHP_RINIT(foo), /* per-request startup function */ PHP_RSHUTDOWN(foo), /* per-request shutdown function */ PHP_MINFO(foo), /* information function */ #if ZEND_MODULE_API_NO >= 20010901 PHP_FOO_VERSION, /* extension version number (string) */ #endif STANDARD_MODULE_PROPERTIES }; If you don't care about source compatibility with earlier PHP releases than 4.1.0, you can drop the #if/#endif lines.